1. Which is a though, spongy tissue holding the bones together and acts as a shock absorber? a. tendon c. jointb. ligament d. cartilage

2. Which part of the bone produces red blood cells?a. bone cell c. bone tissueb. bone marrow d. bone system

3. How many pairs of ribs does a person have?a. 8 c. 25b. 12 d. 30

4. Which is the longest bone of the body found in the thigh?a. femur c. tarsalsodyb. shoulders d. humerus

5. Which is not a function of the skeletal system?a. It acts as the framework of the body.b. It gives a shape and form to the body.c. It protects the muscles of the body.d. It produces the muscles of the body .

6. Which of these is a ball-and-socket joint?a. shoulders c. elbowsb. ankles d. ribs

7. What is cranium?a. heart c. skull b. vertebrae d. pelvis

8. Which skeletal ailment results in the displacement of bone ends from the joints?a. sprain c. fractureb. dislocation d. osteoporosis

9. Which shows proper care of the skeletal system?a. Eating foods rich in calcium and phosphorus. b. Drinking 8-10 glasses of water every day.

c. Watching television until late at night.d. Taking a bath using soap and clean water.

a. Which is an example of an immovable joint?a. skull c. ankleb. knee d. shoulder

10. All of these are skeletal muscles excepta. cardiac muscle c. muscle of the kneesb. muscle of the legs d. muscle of fingers

11. what food should you eat to make your bones and muscles strong?a. chicken c. legumesb. potato chips d. milk

12. Which should cause a bone a muscle injury?a. cramps c. bad fallb. stiffness d. tiredness

13. Which shows proper care of the skeletal and muscular systems?a. Eat plenty of foods rich in protein and carbohydrate.b. Always take a bathc. Maintain good posture all the time d. Have a good recreation and spend time wisely

14. What are the bands and tissues which attach the muscles to the bones?a. ligaments c. originb. tendons d. flexors

15. How do the muscles look when you bend your legs?a. They become shorter.b. They become bigger. c. They become longer and thinner.d. They become tighter.

16. Which of these muscles if involuntary?a. skeletal muscle c. finger muscleb. shoulder muscle d. cardiac muscle

17. Which muscle ailment is caused by prolonged exercise and poor blood circulation?a. rickets c. poliomyelitisb. cramps d. fibrositis

18. How many muscles that the body have?a. 600 c. 550b. 580 d. 206

19. All of these are functions of the muscular system except?a. gives shape and form to the bodyb. helps the bone movec. releases heat to maintain body temperatured. builds body cells and tissues

20. What is the larva of a housefly called?

a. grub c. wrigglerb. maggot d. caterpillar

21. Which sentence describes reproduction?a. it is the ability of an animal to undergo changes as it growsb. it is the ability of an animal to adjust to its environmentc. it is the ability of an animal to feed and take care of its young.d. it is the ability of an animal to produce other animals of the same kind.

22. Which group of animals are born to live?a. elephant, whale, kangaroob. crocodile, kingfisher, turtlec. man, giraffe, tortoise d. bird, butterfly, fly

23. When an egg cell unites with a sperm cell, what takes place?a. metamorphosis c. fertilizationb. reproduction d. menstruation

24. What are the gametes of a male called?a. sperms c. ovaryb. eggs d. testes

25. Which animal undergoes complete metamorphosis?a. mosquito c. houseflyb. butterfly d. grasshopper

26. What is the female sex organ?a. ovary c. eggsb. testes d. epiglottis

27. Which illness is caused by urine of a household pest?a. diarrhea c. leptospirosisb. cholera d. meningitis

28. How are animals which are born alive fed?a. They suck with milk from their mother’s mammary glands. b. They get food on their own.c. Their parents bring them to places where there is food.d. They swim or walk to find food.

29. Why should you avoid spraying insecticides near your pets?a. You may be attacked or bitten by your pet.b. Your pet might not come near you anymorec. Your pet might get poisoned .d. Your pet might have fleas and ticks.

30. Which of these is an enlarged underground rhizome?a. begonia c. onionb. sweet potato d. tulips

31. Brian saw some yellow powdery substances on the stamen of a flower. What are these?a. ovules c. egg b. anther d. pollen grains

32. How do insects like butterflies and bees help plants?

a. They make the garden look beautiful.b. They help in food production or photosynthesis.c. They help in pollination .d. They sip the nectar of flowers.

33. Why is the flower important to the plants?a. It makes the plants attractive.b. It is the reproductive organ of the plants .c. It transfers pollen grains from the anther to the stigma.d. It attracts insects.

34. Oscar cuts mature stems of santan. He puts them in water for some days to grow roots. What is this asexual reproduction called?a. cutting c. budding b. layering d. marcotting

35. Which of these plants reproduce through their leavesa. fern c. tulipsb. golden cactus d. rose

36. All these plants are bulbs, except? a. tulip c. onionb. hyacinth d. rose

37. How do strawberries and grasses reproduce asexually?a. shoots c. bulbsb. runners d. cuttings

38. Which part of a flower attracts butterflies and other insects?a. pollen grains c. antherb. calyx d. corolla

39. How do you know a seed is germinating?a. The seed dries up.b. The petal and sepal fall off.c. The tiny root and stem appear .d. The cotyledons supply food.

40. Which of these causes air pollution?a. red tide c. global warmingb. smog d. oil spillage

41. Why does Brian use hot water to prepare his cup of coffee?a. Brian prefers hot coffee.b. Ground coffee dissolves faster in cold water.c. Increasing the temp also increases the solubility of a substance. d. Coffee granules settle at the bottom of the cup.

42. Why you segregate your garbage?a. It is easy to burn them.b. It is easy to dispose or throw away.c. It can be reused and recycled .d. It causes air and water pollution.

43. What happens when iodized salt is mixed in water?a. The molecules of iodized salt spread evenly in water .b. Iodized salt settles at the bottom of the container.c. The solutions become cloudy.d. Iodized salt solidifies.

44. Which of the following is not a pollutant?a. carbon monoxide c. pesticidesb. industrial wastes d. plants

45. How can you keep the rivers and other bodies of water clean?a. Do not swim in rivers and springs.b. Avoid throwing or dumping garbage into the rivers and other bodies of water .c. Plant water lilies in the rivers.d. Spray insecticides and chemical substances to make the river clean.

46. Why should you prevent or minimized pollution?a. Pollution makes plants and animals healthy.b. Pollution makes the environment safe and clean.c. Pollution causes some diseases and ailments .d. Pollution beautifies the environment.

47. In a cup of boiled water, why will corn seeds not dissolve at all?a. Corn seeds are more hard than the boiled water.b. Corn seeds are insoluble .c. Corn seeds in boiled water is a mixture.d. Boiled water is the silvent.

48. Which is the primary source of heat energy?a. fossil fuels c. sunb. heavenly bodies d. nuclear fuels

49. Which of these ways increases friction?a. using ball bearingsb. applying lubricant or oilc. pulling the object on rough surfaces d. pulling rollers.

50. When you put a metal spoon into a cup of boiling water, how does heat travel?a. radiation c. frictionb. convection d. conduction

51. What happens to some solids when heated?a. they solidifyb. they evaporatec. they liquefy d. they remain the same

52. How does heat move?a. from a cool body to another cool bodyb. from hot body to a cool bodyc. from a cool body to a hot bodyd. from a cool body to another cool body

53. Why do the palms of your hands feel hot when you rub them together?a. because when two surface rub together, friction is produced. b. because the molecules of matter travel fast.c. because heat travels from cool body to a hot body.d. because heat changes matter.

54. At what temperature does water boil?a. 32 C c. 212 Cb. 0 C d. 100 C

55. How does heat from the sun reach the Earth?a. radiation c. convection b. conduction d. convection and conduction

56. Which sentence describes energy?a. Energy is found everywhere.b. Energy is the ability to do work .c. Energy comes from inside the Earth.d. Energy destroys matter.

57. In which state of matter are molecules farthest apart?a. solid c. liquid and solidb. gas d. solid and gas

58. Ifugaos build a steplike ridges on the mountain sides to plant rice. What is this method of preventing soil erosion?a. contour farming c. terracingb. strip cropping d. all of the above

59. why is erosion harmful?a. it takes place slowly.b. it carries soil from one place to another .c. it is caused by flowing or running water.d. it washes away the rich top soil.

60. Which of these agents of soil erosion leads to the formation of sand dunes?a. wind c. manb. flowing water d. other animals

61. On which place will more soil be eroded?a. on a flat landb. on a grass landc. on a slope of a hill d. on a top of a mountain

62. How do trees in the forests prevent soil erosion?a. Loggers cut down trees.b. The roots of the trees absorb much water. c. Soil holds the roots of the trees firmly.d. Trees get uprooted by flash floods.

63. What makes water in the garden muddy after a heavy rain?a. Sand and pebbles are moved by wind.b. Rainwater is brownish in color.c. Soil and small rock particles are washed away by flowing water. d. Erosion causes flash floods.

64. What agent of soil erosion causes rockslides and landslides?a. man c. gravityb. animals d. wind

65. What is the richest part of the soil called?a. topsoil c. rockyb. subsoil d. humus

66. How can soil erosion be prevented?a. replace cut down trees with a new ones b. plant trees on mountain sidesc. plant crops and grass alternately in a rowd. all of the above

67. Which sentence describes erosion?a. Erosion breaks down rocks into smaller pieces.b. Erosion carries or transports small pieces of rocks and soil to other places. c. Erosion causes flashfloods.d. Erosion causes plants to grow best in topsoil.

68. Which instrument do meteorologists use to measure air temperature?a. barometer c. thermometerb. rain gauge d. anemometer

69. Which statement best describes weather?

a. Cloud formation, temperature, wind speed and direction may vary at different locations at the same time.

b. Different places have the same weather conditions at the same time.c. Temperature and cloud formation remain the same at all times.d. Weather changes from places to places at different times .

70. Which of these clouds indicate fair and sunny weather?a. cirrus and stratus c. nimbus and statusb. cumulus and cirrus d. stratus and cumulus

71. What government agency gives an official weather forecast daily?a. Metro forecast c. meteorologists b. MWSS d. PAGASA

72. What are droplets and condensed water on bits of dust called? a. dew c. snowb. clouds d. rain

73. At what temperature does water boil?a. 32 F c. 100 Fb. 98 F d. 219 F

74. What happens to heated air on land surfaces?a. It expands and rises.b. It gets cooled and sinks.c. It evaporates and remains suspended in the air.d. It condenses, then evaporates .

75. Which is not an example of precipitation?a. rain c. sleetb. fog d. smog

76. How is wind named?a. from the direction it is blowingb. from the direction it comes from c. from the direction it blows all the timed. from the direction it rises and falls

77. Why is it cooler when there are more clouds in the sky?

a. because is high up in the sky.b. because the sun does not shine on Earth.c. because the clouds block the heat of the sun. d. because clouds are of different shapes and colors.

78. What is the imaginary path taken by the Earth as it goes around the sun?a. eclipse c. orbitb. axis d. revolution

79. Which of these phenomena results in the Earth’s rotation in a counterclockwise direction?a. occurrence of lunar and solar eclipsesb. sun seems to rise in the east and sets in the westc. causes days and nights d. different places have different seasons

80. What instrument do astronomers use to study heavenly bodies?a. microscope c. telescope b. binoculars d. camera

81. How long does it takes for the Earth to complete a rotation?a. 24 hours c. 29 daysb. 24 months d. 365 ¼ days

82. Which precautionary measure should you do when viewing a solar eclipse?a. look at the sun directlyb. panic because it is a bad omenc. believe that eclipses bring bad luckd. put on sunglasses or smoked glass

83. Why do eclipses occur?a. The Earth revolves around the sun.b. The moon rotates on its axis.c. The light travels in the straight line.d. The heavenly bodies form a shadow.

84. Why do you not feel that the Earth is moving very fast?a. because it moves counterclockwise.

b. because it is very enormous .c. because the sun moves across the sky.d. because the moon is the only satellite of the Earth.

85. Which of the following body systems gives the body its shape?a. digestive systemb. skeletal system c. nervous systemd. skeletal system

86. Which of the following bones protects the lungs?a. ribs b. skullc. hipbonesd. backbone

87. Which is the longest bone in the body?a. thigh bone b. hip bonec. shoulder boned. leg bone

88. What substances make the bone hard and strong?a. proteinsb. vitaminsc. minerals d. fats

89. Why can you turn your head without turning your body?a. A ball-and-socket joint connects the skullto the neck.b. A hinge joint connects the skull to the neck.c. A gliding joint connects the skull to the neck.d. A pivot joint connects the skull to the neck.

90. Which organs of the body are protected by the skull?a. stomach and intestinesb. lungs and heartc. liver and kidney

d. brain and eyes

91. Why is the bone marrow important to the body?a. It produces red blood cells .b. It stores much fat.c. It makes the bone strong.d. It produces a red substance.

92. A woman met an accident. Her spinal column was broken and she became paralyzed. what might be the reason?a. Her heart was damaged.b. Her spinal column was damaged. c. Her legs were broken.d. Her arms were lost.

93. You and your friends were having a race. All of a sudden , one of your friends stopped running and shouted for help. He had a sprain in his ankle. What would you do?a. Let your injured friend walk to the school clinic.b. Place a hot water bag on the sprained ankle. c. Rub the sprained part to keep it warm.d. Place an icebag on the sprained part.

94. Why can bones move in different ways?a. because of the joints. b. because of the skeleton.c. because of the backboned. because of the bone marrow.

95. What prevents moveable bones from getting out of place?a. cartilageb. ligaments c. Fluidd. Minerals

96. How does cartilage protect the moveable bones?a. It makes the bone softb. It covers the bone with soft musclesc. It acts as cushion that prevents wear and tear of bones .

d. It makes the bones thicker at the ends.

97. What do arms muscles do for the person?a. They help the person lift and carry things b. They help the person stand straightc. They help the person walk.d. They help the person sleep.

98. Which of these organs has voluntary muscles?a. arm c. heartb. stomach d. lung

100. When does a muscle pull a bone?

a. when it relaxesb. when it contracts c. when it expandsd. when it bends

101. Which nutrient in foods helps build muscles?

a. iron c. calciumb. vitamin d. protein

102. It is a condition in which there is an uncontrolled shortening of a muscle?

a. strain c. cramp b. fracture d. muscle bruise

103. What is the condition of the muscles which is a result of long hours of work or physical activity? a. sprain c. strain b. cramp d. fracture

104. Why is exercise good for the muscles?

a. It makes the muscles strong. b. It makes the muscles long. c. It makes the muscles stout.

d. It makes the muscles flat.

105. Where does digestion end?

a. mouth c. esophagus b. stomach d. small intestine

106. Rosa cannot swallow her food easily because her salivary glands are infected. What does she have?

a. mumps c. toothache b. diarrhea d. mouthsore

107. What happens to food during digestion?

a. It disappears. c. It is separated from water.b. It is changed to liquid . d. It is removed from the body.

108. Which movement moves the food from the time it leaves the mouth to the time it is digested?

a. chewing c. circulation b. peristalsis d. constipation

109. When do you have a balanced diet?

a. when you drink milk everydayb. when you eat much rice and fish each mealc. when you have fruits and vegetables every meald. when your meal contains the right amount of nutrients needed by the body

110. When Noel chewed rice, he noticed that it tasted sweet. Which nutrient in the food had been changed?

a. fat c. mineral b. carbohydrate d. vitamin

111. Which part of digestive system does digestion start?

a. mouth c. stomach b. small intestine d. large intestine

112. In which part of digestive system are fats digested completely?

a. stomach c. large intestine b. esophagus d. small intestine

113. When does food become useful to the body?

a. when it reaches the cellsb. when it reaches the bloodc. when it reaches the intestinesd. when it reaches the stomach

114. Why will you not get hungry easily if you eat lunch with rice, fried chicken and vegetables?

a. The digestive system works slowly after each meal.b. Vegetables contain fibers which cannot be digested.c. Chicken is harder to digest so it stays longer in the stomach.d. Rice contains carbohydrates so it takes longer time to digest.

115. Which of the following is not a part of the alimentary canal but helps in the process of digestion?

a. small intestineb. stomachc. large intestined. liver

116. Which of the following will prevent constipation?

a. Eat plenty of meat.b. Eat plenty of fruits and vegetables. c. Eat plenty of chocolates.d. Eat plenty of rice.

117. A certain food changes in taste while you are chewing it. What does this show?

a. The food is chemically changed. b. The does not taste good.c. The food is spoiled.d. The food is physically changed.

118. What is the process of reproduction in animals?

a. the process of breaking down food into smaller unitsb. the changes that happen to an animal as it grows

c. the process of producing its own kind d. the process of incubating eggs to help them hatch

119. What happens during fertilization?

a. A sperm unites with an egg .b. An egg disappears.c. A sperm matures.d. A sperm disappears.

120. Which of these animals looks like its parent animal when it is born?

a. birdb. butterflyc. cockroachd. goat

121. What is the larva of a mosquito called?

a. maggotb. wriggler c. nymphd. caterpillar

122. Why does a caterpillar eat and destroy a lot of leaves?

a. It is preparing for its inactive life when it becomes a pupa. b. It is very fond of leaves.c. It is very destructive animal.d. It is a plant-eater.

123. Which of these animals fertilizes its eggs inside its body?

a. fish c. birdb. frog d. butterfly

124. Which shows the correct order in the life cycle of a fly?

a. egg-maggot-pupa-adult c. adult-pupa-maggot-eggb. egg-pupa-maggot-adult d. egg-pupa-adult-maggot

125. What will happen if a sperm unites with an egg?

a. digestion c. metamorphosis

b. incubation d. fertilization

126. Why are earthworms useful?

a. Earthworms eat harmful insects.b. Earthworms can be used as food.c. Earthworms loosen and fertilize the soil. d. Earthworms eat garbage.

127. Why are flowers important to plants?

a. They make the plants attractive.b. They become fruits.c. They protect the ovules. d. All of the above.

128. Which parts of the flower are needed in reproduction?

a. sepals and petalsb. pistil and stamen c. calyx and antherd. pistil and petals

129. Which part of a seed provides food for the young plant?

a. chlorophyll c. cotyledonb. leaves d. roots

130. Why do runners grow into new plants?

a. their stems are surrounded by fleshy leaves.b. their nodes produce new plants.c. their leaves produce new plants.d. their horizontal stems grow along the surface of the ground .

131. A coconut fruit floating in the river may be taken to another place where it could grow into a new plant. What agent of seed dispersal does this show?

a. wind c. waterb. animals d. soil

132. What is inside a seed?

a. a new leaf b. a new plant c. a new root d. a new fruit

133. When does fertilization of an egg in plant take place?

a. when an ovule unites with another ovuleb. when the pollen tube enters an ovule c. when the seed unites with an ovuled. when a flowers becomes a fruit.

134. When would you know that a seed has germinated?

a. when the seed does not changeb. when the seed develops roots and leaves c. when the seed becomes bigd. when the seed splits into two

135. You observe that the ovary of a wilted flower has become big. What does this show?

a. A seed is developing inside the ovary. b. More ovules are being produced in the ovary.c. The ovary is going to break.d. The ovary is going to drop.

136. Which of the following has an underground stem that produces suckers which can grow into new plants?

a. ginger c. Bermuda grassb. potato d. banana

137. why do runners grow into new plants?

a. Their stems are surrounded by fleshy leaves.b. Their nodes produce new plants.c. Their leaves produce new plants.d. Their horizontal stems grow along the surface of the ground.

138. A coconut fruit floating in the river may be taken to another place where it could Grow into a new plan. What agent seed dispersal does this show?

a. windb. animalsc. water

d. soil

139. What is inside a seed?

a. a new leafb. a new plant c. a new rootd. a new fruit

140. When does fertilization of an egg cell in a plant takes place?

a. when an ovule unites with another ovuleb. when the pollen tube enters an ovule c. when the seed unites with an ovuled. when a flower becomes a fruit

141. When would you know that a seed has germinated?

a. when the seed does not changeb. when the seed develops roots and leaves c. when the seed becomes bigd. when the seed splits into two

142. You observe that the ovary of a wilted flower has become big. What does this show?

a. A seed is developing inside the ovary. b. More ovules are being produced in the ovary.c. The ovary is going to break.d. The ovary is going to drop.

143. Why is soil important for the survival of people and animals?

a. Soil is the outer covering of the earth.b. Many microorganism live in soilc. Plants grow in soil .d. Soil holds water.

144. A farmer’s field is on the slope of a mountain. In what way can he prevent the soil from being washed away by rain.

a. build a canal at the foot of the mountainb. use a crop rotationc. use contour plowing d. build a fence around the field

145. Why is topsoil good for plant growth?

a. It contains decayed parts of plants and animals .b. It contains particles of sand.c. It is made of tiny particles of rock.d. It is made mostly of clay.

146. In which of these landforms would soil be easily eroded?

a. valleyb. plainc. plateaud. mountain

147. Which agent of erosion carries the greatest amount of soil to another place?

a. windb. water c. animald. people

148. Which of the following continuously changes the surface of the earth?

a. earthquakeb. volcanic eruptionc. erosion d. rocks

149. The passing wind causes the branches of trees to break? What is the wind speed?

a. slowb. fastc. very fast d. moderate

150. Which temperature reading shows the warmest air?

a. 35 degree Celsius b. 20 degree Celsiusc. 25 degree Celsiusd. 10 degree Celsius

151. There are layers of clouds that cover part of the sky. What kind of clouds are these?

a. stratus clouds b. cirrus cloudsc. cumulus cloudsd. nimbus clouds

152. You are facing north. You observe that dried leaves are being blown toward the direction you are facing. Where is the wind coming from?

a. south b. eastc. northd. west

153. How does water evaporate when air is saturated?

a. very slowlyb. very fastc. slowly d. past

154. You observed that droplets of water formed outside a glass of cold water. Where do these droplets come from?

a. from water inside the glass.b. from ice inside the glass.c. from ice in the air.d. from water vapor in the air touching the glass .

155. How are clouds formed?

a. by the heating of air.b. by cooling of water vaporc. by cooling of water in the seas.d. by evaporation of water .

156. When does the earth receive more energy from the sun?

a. when there is moisture in the air.b. when the sun is at the horizonc. when clouds reflect some radiant energy back into space.d. when earth absorbs the radiant energy coming from space .

157. You observed that the clouds are low. Which of the following will you infer?

a. There is much water vapor in the air.b. There is very little water vapor in the air.c. Air moves upward in places near the sea.d. Rain will fall very soon.

158. Which of the following statements about air movement is true?

a. Air moves form a high pressure area to a low pressure area .b. Air moves from a low pressure area to a high pressure area.c. Air moves upward in places near the sea.d. Air moves downward in places near mountain.

159. About how many rotations does the earth make in one revolution?

a. 12 c. 24b. 30 d. 365

160. What is the direction of the Earth’s rotation?

a. from south to northb. from east to westc. from west to east d. from north to south

161. What is the period of time called year?

a. the time it takes the moon to rotate on its axisb. the time it takes the moon to revolve around the earthc. the time it takes the earth to revolve around the sun d. the time it takes the earth to rotate on its axis

162. How long does it take the earth to make a complete rotation on its axis?

a. one year c. one dayb. one month d. one week

163. What is the earth’s path around the sun called?

a. orbit c. rayb. axis d. phase

164. In which phase of the moon would a lunar eclipse occur?

a. full moon c. half moonb. new moon d. Gibbous moon

165. Why do we see only one side of the moon?

a. The moon rotates once as it makes one turn around the earth b. The moon does not leave its position in space.c. The moon revolves around the earth and the sund. The moon rotates twice as it makes one turn around the earth

166. How many days are there in a leap year?a. 368 c. 354b. 366 d. 362

167. Which of the following would happen if the earth did not rotate?

a. The sun would not shine on earthb. We would not have days and nights c. We would not have a new yeard. The earth would fall in space.

168. Which of the following number tells that the earth is about to complete one revolution?

a. 30 daysb. 250 daysc. 100 daysd. 365 days

169. How will you observe a solar eclipse safely?

a. use a hatb. use clear eyeglasses c. use film negatives in viewing the eclipsed. use a black umbrella

170. Why does a solar eclipse occur only during a new moon?

a. the sun is between the moon and the earthb. the moon is between the sun and the earth c. the earth is between the sun and the moon.d. the sun, moon ,and earth are not aligned

171. A pear shaped hallow organ that serves as storage or container, digester and mixer.

a. enzymesb. valvec. biled. stomach

172. How many muscles are there to make up muscular system?

a. 400b. 600 c. 450d. 650

173. Made up of bone cells and lone tissues.

a. bones b. skeletalc. cellsd. tissues

174. It holds the bones together at moveable joints.

a. cartilageb. collagenc. ligaments d. phosphorus

175. It is made up of the skull , spine, vertebral column.

a. appendicular c. musclesb. axial d. Ligaments

176. It is a fluid which comes from liver and stored in gall bladder.

a. enzymes c. Bileb. valve d. Stomach

177. This enzymes mixes with saliva and changes starch into sugar.

a. ptyalin c. Dentb. amylase d. Epiglottis

178. It is the male part of the flower.

a. ovule c. Filamentb. anther d. Stamen

179. It is the female part of a flower.

a. pollen grains c. Pollinationb. pistil d. Stigma

180. It is formed during fertilization after the sperm cell unites with the egg cell.

a. zygote b. protozoansc. cellsd. seeds

181. Matter is made up of very tiny particles called.

a. protonsb. mixturesc. molecules d. substance

182. It is the universal solvent.

a. water b. mixture c. solutiond. substance

183. Ability of matter to dissolve into other kinds of matter.

a. waterb. suspensionc. filtrationd. solubility

184. Farmers help prevent erosion through:

a. contour farmingb. terracingc. strip cropping

d. all of the above. 185. Movement of air towards the water is called:

a. sea breeze b. land breezec. low pressured. high pressure

186. Cloud formation near the ground.

a. snowb. fog c. raind. precipitation

187. It gives the clues to determine the weather.

a. rain c. cloudsb. wind d. Thermometer

188. Darkest portion of the moon’s shadow.

a. lunar eclipseb. penumbrac. eclipsed. umbra

189. Moving energy or energy put into work.

a. kinetic energy b. potential energyc. chemical energyd. work

190. Process of removing the liquid component such as water from mixture.

a. filtrationb. dissolvingc. evaporation d. suspension

191. Horizontal stems that produce new plants when their nodes touch the ground.

a. creeping stems c. suckers

b. runners d. bulb

192. Tiny living plant inside the side.

a. radical c. embryo

b. hypocotyl d. seed coat

193. Seeds with two cotyledons are called

a. mono oot c. phemule

b. decots d. radicle

194. The moon has no light of its own. It only reflects light from?

a. Earth c. light

b. sun d. star

195. It is the condition of the atmosphere from day to day at a certain place.

a. weather b. temperature c. speedd. direction

196. Asexual reproduction is also called vegetative reproduction which maybe done through these except?

a. cutting b. runnersc. bulbsd. tuber

197. These are the agent of pollination except

a. wind b. water c. sund. man

198. Which of the following statement s refers to climate?

a. It is so hot today b. The temperature today is as cold as that of yesterday.c. It is hot all year round at the desert.d. It is cooler in the morning than in the afternoon.

199. How does a breeze blow?

a. from a cold area to a warm areab. from a warm area to a cold areac. from a high place to another high place d. from a low place to a high place

200. Which part of the Earth have the lowest temperature?

a. north and south polar regionb. north temperate zonec. south temperate zoned. equatorial region

201. Why do the different parts of the Earth receive unequal heating from the sun?

a. The Earth’s axis is tilted 23 ½ degrees.b. The Earth rotates on its axis 24 hours.c. The sun rays strike the surface of the Earth at different angles.d. All of the above .

202. Why do winds deflect to the right in the northern hemisphere and to the left in the southern hemisphere.

a. because the wind is lightb. because the wind has strong force c. because the Earth rotates from west to eastd. because Earth revolves around the sun.

203. Why does the southwest monsoon bring heavy rains?

a. The air is carrying much moisture. b. The air is very warm and dry.c. The air moves fast.d. The air pressure is high.

204. What is the basis for the classification of Philippine climate?

a. temperature b. rainfallc. humidityd. tropical cyclone

205. What is the season in the northern hemisphere when the North Pole is tilted 23 ½ degrees toward the sun?

a. summer c. autumn b. winter d. spring

206. Which of the following terms describes latitude?

a. how strong a wind is blowingb. how hot or cold a place isc. how far east or Weston the globe a place is locatedd. how far north or south of the equator a place is located

207. What happens to water vapor that goes up to high altitude?

a. It is cooledb. It is heatedc. It evaporates d. It produces wind

208. In what direction does the Earth rotate?

a. from east to west b. from west tom east c. from north to southd. from south to north

209. Why is it very hot at the equatorial region?

a. The rays of the sun strike vertically at the equatorial region.b. The rays of the sun strike horizontally at the equatorial region. c. The rays of the sun strike in circles at the equatorial region.d. The rays of the sun are very hot at the equatorial region.

210. What happens to the air at the equatorial region?

a. It disappears in the atmosphere.b. It condenses into snow. c. It goes down then it is cooled.d. It rises then it is cooled .

211. How is a cyclone described?

a. It is a low pressure area.b. It is a high pressure area. c. It is a low pressure area with a circular wind motion.d. It is the movement of the wind from the land to the sea.

212. Which is the thickest layer of the Earth.

a. inner core c. crustb. outer core d. mantle

213. Which of the following has helped provide scientists with information about the Earth’s interior.

a. formation of mountainsb. erosion on Earth’s surfacec. volcanic eruptions and earthquakesd. crustal plates on the Earth’s surface .

214. What causes a volcano to erupt?

a. The magma works its way upward through the cracks in the rocks above .b. There is too much water inside the Earth.c. There is fire inside the Earth.d. The hot rocks inside the Earth explode.

215. Why are there many volcanoes in the Philippines?

a. The Philippines is an archipelago.b. There are many faults and trenches in the Philippines. c. The Philippines is located near the equator.d. The Philippines is surrounded by water.

216. Why is the Earth’s crust in constant motion?

a. It lies on top of the liquid part of the mantle.

b. It is broken into big platesc. It has big bodies of water .d. It is being pulled by gravity.

217. Which of these is the bad effect of the eruption of Mt. Pinatubo?

a. cooling of world temperature for several yearsb. filtering the sun’s lightc. destruction of lives and property d. cleaning of the atmosphere

218. What will you do when you are on the street during an earthquake.

a. stand still.b. stand beside a post.c. hide inside a building.d. stay away from posts and buildings .

219. Which of the following tells about the magnitude of an earthquake?

a. distance from epicenterb. depth of focus c. duration of shakingd. amount of energy released

220. Why are the ashes from an erupting volcano very hot?

a. Ashes are heated by the sun.b. Ashes are burned by ultra violet rays.c. Ashes come from the hot interior of the Earth .d. Ashes come from hot springs.

221. Which is the hottest part of the Earth?

a. core b. mantlec. crustd. atmosphere

222. What is the effect of the erosion and volcanic eruption of the Earth?

a. They make the Earth smaller.b. They increase the size of the Earth.c. They form more volcanoes.

d. They change the Earth’s surface .223. A bulletin was issued to warn people that Taal Volcano may erupt within the week.

What should the people living in the danger areas do?

a. Wait for the next bulletin.b. Cover the roof with wet sacks.c. Reinforce the roof of their houses.d. Follow orders to evacuate.

224. Ashes from an erupting volcano are all over your place. What should you do to protect yourself?

a. Cover the nose with wet cloth.b. Stay inside the house .c. Wear sunglasses.d. Wear a hat.

225. Your family is going to evacuate. You are told to bring along only a few things. which of these will you bring along?

a. chairs, tables and closetsb. food, water and clothes c. pets, toys and booksd. candles, rags and matches

226. Why can you see a very distant object through a telescope?

a. A telescope can make the image of an object very much bigger .b. A telescope works like a camera.c. A telescope can make an image very clear.d. A telescope makes a big obeject real.

227. The sun is one of the stars. Why does it outshine all the other stars as we see it from The earth during daytime.

a. It is bigger than all the other stars. b. It has a yellow lightc. It is nearer to earth than all the other stars.d. It is the hottest star.

228. Why can the sun give off heat and light

a. It has many chemicalsb. It is a ball of burning gases

c. It is made of iron and steeld. It is made of burning liquids.

229. Which of these stars are the youngest?

a. red stars b. orange starsc. yellow starsd. white stars

230. Why is the north star used as a guide for locating directions?

a. It is the brightest star in the sky. b. It is a star in the constellation ursa minor.c. It appears to remain in the same position.d. It is the most beautiful star in the northern hemisphere.

231. The Milky Way is a galaxy which consists of billions of stars. Why is it very important Galaxy for us?

a. It is the biggest galaxy in the universeb. It is a spiral galaxyc. It is a very young galaxyd. It is the galaxy which our solar system belongs .

232. How do scientists describe the universe based on the sizes, distances and movements of the stars and galaxies?

a. The universe is dyingb. The universe is getting smallerc. The universe is expanding d. The universe is contracting

233. One of the greatest inventions of man is the artificial satellites. Why?

a. It enables man to study the earth and its atmosphere. b. It enables man to get information about other planets.c. It enables man to invent more advanced equipments and facilities.d. All of the above.

234. Why is it very necessary for a rocket to reach its “escape velocity” ?

a. to reach the moon immediatelyb. to reach the sun as soon as possible

c. to escape the force of gravity d. to escape the thick layer of the atmosphere

235. Why does an astronaut bring oxygen during his space travels.

a. Oxygen in outer space is very expensiveb. Oxygen in outer space is poisonousc. There is no oxygen in outer space .d. There is only carbon dioxide in outer space.

236. Why should spaceships be made of very strong materials?

a. There are very large meteors that travels at great speeds which can damage the ships.

b. It is very hot in outer space.c. The spaceship may collide with the stars .d. The surface of the moon is filled with big rocks and craters.

237. Which of the following statements refers to climate?

a. It is so hot todayb. The temperature today is as cold as that of yesterday .c. It is hot all year round in the dessert.d. It is colder in the morning than in the afternoon.

238. How does a breeze blow?

a. from a cold area to a warm area.b. from a warm area to a cold area.c. from a high place to another high place.d. from a low place to a high place.

239. Which parts of the earth have the lowest temperature?

a. The earth’s axis is tilted 23 ½ degrees.b. The Earth rotates on its axis every 24 hours.c. The sun’s rays strike the surface of the earth at different angles.d. All of the above .

240. Why do winds deflect to the right in the northern hemisphere and to the left in the Southern hemisphere?

a. because the wind is light.b. because the wind has strong force.

c. because the Earth rotates from west to east. d. because Earth revolves around the sun.

241. Why does the southwest monsoon bring heavy rains?

a. The air is carrying much moisture. b. The air is very warm and dry.c. The air moves fast.d. The air pressure is high.

242. What is the basis for the classification of Philippine climate?

a. temperature b. rainfallc. humidityd. tropical cyclone

243. What is the season in the northern hemisphere when the north pole is tilted 23 ½ degrees toward the sun?

a. summer b. winter c. autumnd. spring

244. Which of the following terms describes latitude?

a. how strong a wind is blowingb. how hot or cold a place isc. how far west or east on the globe a place is locatedd. how far north or south of the equator a place is located.

245. What happens to water vapor that goes up high altitude?

a. It is cooledb. It is heatedc. It evaporates d. It produces wind

246. In what direction does the earth rotate?

a. from east to west c. from north to southb. from west to east d. from south to north

247. Why is it very hot in equatorial region?a. The rays of the sun strike vertically at the equatorial region b. The rays of the sun strike horizontally at the equatorial regionc. The rays of the sun strikes in circles ate the equatorial regiond. The rays of the sun are very hot at the equatorial region.

248. What happens to the air at the equatorial region?

a. It disappears in the atmosphereb. It condenses into snowc. It goes down then it is cooledd. It rises then it is cooled .

249. How is a cyclone described?

a. It is a low pressure area. b. It is a high pressure area.c. It is a low pressure area with a circular wind motiond. It is a movement of the wind from the land to the sea.

250. Which is the thickest layer of the Earth?

a. inner coreb. outer corec. crustd. mantle

251. Which of the following has helped provide scientists with information about the Earth’s interior?

a. formation of the mountains.b. erosion on the Earth’s surface.c. volcanic eruptions and earthquakes. d. crustal plates on the Earth’s surface.

252. What causes a volcano to erupt?

a. The magma works its way upward through the cracks in the rocks above. b. There is too much water inside the Earth.c. There is fire inside the Earth.d. The hot rocks inside the Earth explode.

253. Why there are many volcanoes in the Philippines?

a. The Philippines is an archipelago.b. There are many faults and trenches in the Philippines. c. The Philippines is located near the equator.d. The Philippines is surrounded by water.

254. Why is the Earth’s crust in constant motion?

a. It lies on top of the liquid part of the mantle. b. It is broken into big plates.c. It has big bodies of water.d. It is being pulled by gravity.

255. Which of these is the bad effect of the eruption of Mt. Pinatubo?

a. Cooling of world temperature for several years.b. Littering of sun’s life.c. Destruction of lives and property. d. Cleaning of the atmosphere.

256. What will you do when you are on the street during an earthquake.

a. Stand still.b. Stand beside a post.c. Hide inside a building.d. Stay away from posts and building.

257. Which of the following tells about the magnitude of an earthquake?

a. distance from epicenter.b. depth of focus.c. duration of shaking.d. amount of energy released.

258. Why are the ashes from an erupting volcano very hot?

a. Ashes are heated from the sun.b. Ashes are burned by ultraviolet rays.c. Ashes come from the hot interior of the Earth. d. Ashes come from hot springs.

259. Which is the hottest part of the Earth?

a. core b. mantle

c. crustd. atmosphere

260. What is the effect of the erosion and volcanic eruptions on the Earth?

a. They make the earth smaller.b. They increase the size of the Earth.c. They form more volcanoes.d. They change the Earth’s surface.

261. You see a flag waving on a pole. A force is acting on the flag. What is exerting that force?

a. wind b. waterc. gravityd. magnet

262. When you throw a ball, it goes up; then it goes down. Why?

a. The force that moves it is not strong.b. Gravity does not act on the ball upon release.c. Gravity pulls the ball down. d. The speed of the ball is affected by air friction.

263. Why does a bus going uphill travel more slowly than one going downhill?

a. It is helped by gravity. b. It is moving against gravity.c. There is more friction in going up.d. The cold wind pulls it down.

264. A jeepney travels 120 kilometers in 3 hours. What is its average speed?

a. 120km/hrb. 60km/hrc. 40km/hr d. 43km/hr

265. A car had engine trouble just as it was about to go downhill. The driver wedged rock in front of the wheel. What force is each rock trying to overcome?

a. gravityb. friction c. magnetism

d. inertia266. What does a traffic sign of 60km/hr on a road mean?

a. The minimum speed a car may travel is 60km/hr. b. The maximum speed a car may travel is 60km/hr.c. A car may travel more than 60km/hr when traffic is light.d. A car is not allowed to have a speed of 60km/hr.

267. Why is a speed of 10km/hr required at school zones?

a. to economize on fuel.b. to prevent damage to vehicles.c. to prevent vehicles from bumping one another.d. to keep the children safe from vehicular accident.

268. Which would require the greatest force to make a sudden stop?

a. A car travelling at 120km/hr.b. A car travelling at 80km/hr. c. A car travelling at 60km/hr.d. A car travelling at 10km/hr.

269. A car and a truck are travelling in the same direction at the same speed. Why would the car accelerate faster than the truck?

a. The car has more gasoline.b. The car has a new engine.c. The car has less force. d. The car has less mass.

270. A bus is travelling at a speed of 60km/hr bus. Suddenly, the driver stepped on the brakes. In what direction will the passengers be thrown when the bus suddenly stops?

a. backward b. sideward leftc. forwardd. sideward right

271. What forms of energy do muscles, wind and running water show when they work?

a. mechanical energy b. sound energyc. nuclear energyd. potential energy

272. A big mango fruit is on the edge of table. What kind of energy does it have?

a. mechanical energyb. heat energyc. potential energy d. kinetic energy

273. A boy threw a ball over the fence. What energy did the moving ball have?

a. potential energyb. heat energyc. mechanical energy d. light energy

274. Which sequence of energy transformation takes place when you switch on an electric bulb?

a. light ---- heat---- electricalb. electrical ---- heat --- lightc. electrical ---- light ---- heat d. heat ---- electrical ---- light

275. When gasoline is burned in a car engine and the car moves, what energy is generated?

a. chemical energyb. nuclear energy c. mechanical energy d. light energy

276. What form of energy is released when a uranium atom is split?

a. potential energyb. nuclear energy c. mechanical energyd. chemical energy

277. What is the process of changing one form of energy into another to make it useful?

a. nuclear energyb. energy transformation c. potential energyd. kinetic energy

278. Which is an example of heat transfer by conduction? a. boiling water b. a very warm room c. a spoon in very hot water d. your warmth as you stay near the stove

279. What kind of energy is involved when ice melts?

a. light energyb. chemical energyc. heat energy d. nuclear energy

280. How can you conserve electricity at home?

a. Switch off the light when not needed. b. Turn on the air conditioner even when the weather is cool.c. Iron one piece of clothing every time you need to wear one.d. Leave refrigerator open for a long time.

281. Which of the following shows that electrical energy is transformed into sound energy?

a. when the passengers in the car talkb. when the policeman blows his whistle c. when the passenger gets off his card. when the driver blows the horn of the car

282. How is the sun’s heat transferred to the objects on Earth?

a. by conductionb. by convectionc. by radiation d. by transformation

283. Green plants transform the sun’s energy into chemical energy. Food inside the body combines with oxygen and produces heat in your body. Where does the heat of your body go?

a. to the clothes you wearb. to the stomachc. to the environment d. to the face

284. When the nuclei of certain hydrogen atoms are forced to combine, tremendous energy is

produced. What is this process called?a. nuclear energyb. nuclear fissionc. nuclear fusion d. nuclear transformation

285. Why are disinfectants used in bathroom?

a. They can easily be bought in stores.b. They have a good smell.c. They are easy to use.d. They kill diseases-causing microorganisms.

286. Which of the following is an antiseptic?

a. rat killerb. muriatic acidc. insect sprayd. hydrogen peroxide

287. Why additives are used in foods?

a. to improve the flavor and texture of food b. to make the food sweetc. to preserve the foodd. to add vitamins to the food

288. Why are synthetics widely used?

a. They are heat-resistant and water- resistant. b. They are soft.c. They have many colors.d. They are made of plastics.

289. Why are metals used for making utensils and tools?

a. They are shiny and beautiful.b. They can be made into different shapes. c. They are strong and heavy.d. They are white and easy to clean.

290. Why is technology very important and useful in modern life?

a. It helps produce better things and better ways of doing things.

b. It is producing expensive materials.c. It is an application of knowledge in science.d. It helps discover knowledge in science.

291. Why do liquids take the shape of their containers?

a. Their molecules are closely packed.b. Their molecules can slide around each other.c. Their molecules are shapeless.d. Their molecules are smaller than those of solids.

292. What is at the center of an atom?

a. spaceb. nucleus c. liquidd. air

293. Which of the following happens when too much carbon dioxide is present in the \ atmosphere?

a. global warming b. stormc. blackening of cloudsd. strong wind

294. Which of the following is the major cause of the pollution?

a. erosion of soilb. use of different materialsc. hole in the ozone layerd. burning of fuels

295. Which part of an atom is electrically neutral?

a. protonb. neutron c. electrond. nucleus

296. What is the smallest particle of a chemical element that retains the characteristics of that element?

a. molecule

b. atomc. electrond. proton

297. You have many kinds of materials in your home. How can you use them to prevent accidents?

a. Read labels and instructions before using them. b. Do not use them at all.c. Display all materials in different parts of the house.d. Do not throw away empty bottles and cans.

298. How can you produce chemical change in wood?

a. Chop it.b. Cut it into many tiny pieces.c. Burn it. d. Put it in water.

299. Why is kaingin a bad practice?

a. It does not produce enough food.b. It clears land by cutting down trees. c. It pollutes the rivers and seas.d. It pollutes the land.

300. How does reforestation help the environment?

a. Big trees are cut down for lumber.b. Big animals graze the land.c. New animals live in the forest.d. Young and fast growing trees are planted in denuded areas.

301. How can good soil help a big population?

a. Good soil is free from chemicals. b. Good soil contains water and air.c. Good soil helps produce more crops.d. Good soil contains humus.

302. How can we prevent diseases?

a. by breathing clean air.b. by making our surroundings clean.

c. by sleeping 8 to 10 hours a day.d. by controlling population growth.

303. Which of the following will reduce garbage by using again some old materials?

a. burning old materialb. painting old materialsc. recycling old materials d. throwing old materials

304. Why are people part of ecosystem?

a. They are intelligent.b. They take care of living things.c. They interact with living things and nonliving things. d. They produce chemicals for living things.

305. Which of the following problems would arise if the number of people in a placeIncreases very fast?

a. not enough houses for all people in the placeb. not enough food for all people in the placec. not enough water for all people in the placed. all of the above

306. When the number of people in the barangay increases, which of the following will also increases?

a. amount of garbage b. amount of sunlightc. amount of raind. amount of soil

307. What harm can erosion do to the soil?

a. It makes the soil brown.b. It makes the soil coarse.c. It removes the tiny animals from the soil.d. It removes the rich topsoil.

308. Why are forests important to us?

a. They make the earth beautiful.b. They prevent floods .c. They prevent volcanic eruptions.

d. They give off carbon dioxide.309. How does recycling help protect the environment?

a. Recycling helps reduce the garbage problem.b. Recycling can produce beautiful things.c. Recycling can help you earn money.d. Recycling is a good practice.

310. Why problems may arise in an overcrowded community?

a. food storageb. water shortagec. poor healthd. all of these

311. Which of these materials is needed during photosynthesis?

a. carbon dioxide c. soilb. nitrogen d. oxygen

312. What will happen if there is overpopulation of an organism in a habitat?

a. It will help the ecosystem. b. It will harm the ecosystem.c. It will not affect the habitat.d. It will not affect the ecosystem.

313. A mushroom in a fungus that cannot make its own food.

a. It has no stem.b. It has noroots.c. It has no leave. d. It has no chlorophyll.

314. Which of the following may disrupt a food chain?

a. reforestrationb. ecosystemc. overcrowding d. food nutrient cycle.

315. Why is the plant called a producer?

a. Plant is eaten by animals.

b. Plant is eaten by people.c. Plant has many uses. d. Plant can make its own food.

316. Which of these is the work of decomposers?

a. They break down dead plants and animals .b. They help return nitrogen to the airc. They feed on decayed animalsd. They help plants manufacture their foods

317. Which of the following shows energy transfer in a food chain?

a. Energy is lost to the air.b. Energy is transferred from producer to consumer.c. Energy is transferred from consumer to producer.d. Energy is increased from one consumer to another consumer.

318. What kind of relationship in an ecopsystem exists when both organisms are benefited.

a. parasitismb. commensalism c. predator-preyd. mutualism

319. You are a growing child. Which of the following nutrients are needed by your bones and teeth?

a. carbohydratesb. fatsc. proteinsd. minerals and vitamins

320. Which of the following foods are rich in protein?

a. rice and cornb. fruits and vegetables c. fish and chickend. milk and cake

321. Which of the following can make a balanced diet?

a. rice, fish and softdrinkb. bread, cheese, chicken, banana and fruit juice

c. cake, ice cream ,popcorn and coffeed. hot cake, hot tea, and hotdog

322. Why is water important for the body?

a. Water regulates body temperature. b. Water provides oxygen to the blood.c. Water increases one’s weight.d. Water removes carbon dioxide from the blood.

323. Why is exercise good for the body?

a. It helps the body to relax.b. It makes the person tall.c. It gives the body power and energy. d. It provides rest the muscles.

324. What health problem would a child who eats too much sweets have?

a. stomach acheb. anemiac. scabiesd. tooth decay

325. Why is it important to have a healthy body?

a. A healthy body can also produce healthy mind.b. A healthy body is beautiful.c. A healthy body is big.d. A healthy body never gets sick.

326. Why is jogging a good form of exercise?

a. It helps different muscles in the body become strong. b. It makes the muscle thinner but stronger.c. It makes the muscle contract and expand.d. It relaxes the muscles.

327. How does a child is accepted and loved feel?

a. The child feels sickly.b. The child feels lonely.c. The child feels threatened.d. The child feels secure.

328. Which part of the nervous system is found in all parts of the body?

a. spinal cordb. cerebrumc. nerves d. cerebellum

329. What carry messages from the sense organs to the brain?

a. motor nervesb. sensory nerves c. connector nervesd. blood vessels

330. What important work is done by the nerves?

a. to carry bloodb. to carry messages c. to protect the braind. to protect the spinal cord

331. Which of the following is a safety practice in the bathroom?

a. keep the bathroom floors always dry b. keep the bathroom soap trayc. keep the bathroom floor shinyd. keep the bathroom always open

332. Which part of the brain controls reflex actions?

a. cerebellum b. cerebrumc. medulla oblongatad. occipital lobe

333. Why is our nervous system important?

a. It helps us gather information about the things around us.b. It helps us move our muscles.c. It helps our body organ to move.d. All of the above

334. Why should you protect your brain from injury?

a. The brain is the center of our body. b. The brain controls the work of all the parts of the body.c. The brain helps us think.d. The brain is connected to the spinal cord.

335. What is the most important function of the nerves?

a. They are all over the body.b. They carry messages from one part of the body to another. c. They are connected to the spinal cord.d. They are connected to the brain.

336. Which body structure links the brain with the rest of the body?

a. spinal cordb. blood vesselsc. meningesd. motor nerves

337. Which animal has rabies virus that can cause death when someone is bitten by the animal?

a. cockroachb. mosquitoc. dog d. rat

338. Which of the following is a reflex movement?

a. blinking your eyes when something comes near your faceb. jerking your knee when someone taps itc. drawing your hand away from burning candled. all of these .

339. Which of the following explains what problem is?

a. It is a question for which you are trying to find an answer. b. It is an explanation of a difficulty.c. It is an answer to a certain question.d. It is a situation that requires mathematical computation.

340. Which of the following is stated as a problem?

a. How are you today?b. Which will weigh heavier, oil or alcohol? c. Sometime the sun can be seen from the sky . sometimes it hides behind the

clouds.d. Oil and alcohol have different densities.

341. What is important to know when you have a problem?

a. forget your problemsb. write the problemc. try to know how to find the answer to the problem d. ask other people to help you solve the problem

342. What is the manipulated variable?

a. variable to be tested b. variable to be rejectedc. variable to be acceptedd. variable to be changed

343. You want to observe the difference between the heights of two plants. Which tool do you need?

a. microscopeb. lensc. ruler d. platform balance

344. Early man learned a great deal about plants because

a. there were plenty of forests thenb. plants were more interesting than animals c. he depends upon them for his basic needsd. plants were more accessible and available

345. What event opened up new fields in the science of biology?

a. the conquest of the Greeks by the romans b. the invention of microscopec. the formulation of the scientific methodd. the setting up of the science of taxonomy

346. Which of the following does not describe a hypothesis

a. It is an answer to a problem.b. It is an educated guess.c. It is a prediction. d. It is a proposed solution to a problem.

347. What is a fundamental hypothesis that has survived the test of time?

a. conclusionb. generalizationc. lawd. theory

348. Which substance is the most abundant in the ecosystem?

a. patsb. water c. proteind. nucleic acid

349. This element is present in hemoglobin of red blood cells

a. heme b. globinc. irond. magnesium

350. It is a bond that is formed between carbon and hydrogen in methane CH4

a. ionic b. polarc. covalentd. hydrogen

351. This element is present in proteins only

a. sulfurb. oxygenc. calcium d. nitrogen

352. This property of water preserves life beneath the frozen lake

a. high specific heatb. high density

c. high surface tensiond. polarity

353. DBA consist of

a. ribose; tyrosineb. ribulose adenine, sulfate c. deoxyribose, thymine, phosphated. hexoses, guanine, chlorate

354. Which is a carbohydrate?

a. starch in a rice b. myosin in meatc. fats in lardd. albumin in plasma

355. This is a raw material for the synthesis of organic matter.

a. nitrous oxideb. carbon dioxidec. glucose d. ammonia

356. Amino acid is to protein as

a. fats is to glycerol b. nucleic acidis to ademinec. glucose is to carbohydrated. carbon is to sugar

357. Which structure would tell you that a cell is that of a bacterium?

a. DNAb. ribosome c. plasma membraned. cell wall

358. All cells have

a. nucleus b. chloroplastc. cell walld. plasma membrane

359. Most of the photosynthesis in a leaf takes place in the

a. upper epidermis b. palisade layerc. spongy layerd. lower epidermis

360. The process by which energy is released in living organisms is called

a. metabolism b. excretionc. respirationd. nutrition

361. The starting material for respiration to proceed is the

a. pyruvate b. oxygen c. acetyl CoAd. glucose

362. Which of the following can not be a secondary consumer?

a. frogb. manc. grasshopperd. snake

363. Which are the decomposers?

a. grassesb. bacteria c. miced. deer

364. Each step in a food chain is referred to as a

a. energy level b. trophic levelc. habitatd. energy pyramid

365. Which animal uses cutaneous respiration?

a. dragonfly b. earthwormc. turtled. spider

366. Exchange of gases occurs in

a. larynx b. tracheac. bronchioled. alveoli

367. Which animal uses gills as the respiratory organ?

a. crocodile b. starfishc. hombilld. whale

368. Which is not an excretory organ?

a. skinb. lungs c. kidneyd. anus

369. nitrogen wastes in birds is excreted by

a. urea b. uric acidc. creatinined. ammonia

370. Which is not an adaptation in arctic mammals

a. black colorb. small sizec. thick furd. absence of sweat glands

371. What region of the root contains root hairs?

a. region of cell division

b. region of elongationc. region of maturationd. root cap

372. Which essential mineral is a component of chlorophyll?

a. calcium c. potassiumb. magnesium d. molybdenum

372. Which tissue is merismatic?

a. xylem c. vascular cambiumb. cortex d. endodermis

373. Which of these conductive cells contains nucleus?

a. vessel b. tracheidc. sieve celld. companion cell

374. What structural modification is found in a gabi plant?

a. tuberb. rhizomec. corn d. bulb

375. A faithful replication from parent cell to daughter cell is seen in

a. mitosis b. meiosisc. cytokinesisd. gametogenesis

376. DNA replication occurs during

a. telophase b. metaphasec. prophased. interphase

377. This is a diploid cell in gonad.

a. secondary oocyteb. Spermatidc. oogonia d. secondary spermatocycle

378. The seed originates from the

a. ovaryb. ovule c. pistild. anther

379. The megaspore gives rise to the

a. polentb. embryo sac c. endospermd. zygote

380. The structure which serves as the birth control is the

a. vaginab. cervixc. uterusd. fallopian tubes

381. In human reproduction, the site of fertilization is the

a. ovary b. oviductc. uterusd. cervix

382. Pregnancy is established when there is

a. union of sperm and egg b. rise in level of progesteronec. successful implantation of blastocyst in uterine walld. the zygote is activated to undergo cleavage

383. This embryonic structure gives rise to the extra embroyonic membranes

a. trophoblast b. inner cell mass

c. blastulad. placenta

384. Which structure in the seed nourishes the embryo?

a. radicleb. seed coatc. embryo sac d. endosperm

385. The process restores the diploid chromosome number of the organisms.

a. fertilizationb. gametogenesisc. differentiation d. parturition

386. A banana plant reproduces through the formation of _______

a. runner b. budsc. rhizomed. sucker

387. Tetrads align at the equator during

a. metaphase 1b. prophase IIc. prophase Id. metaphase II

388. When cancer cells invade new locations and develop new tumors, this is called ____

a. cell proliferationb. metastasis c. mitosisd. metamorphosis

389. Which is not a characteristic of monerans?

a. they do not have membrane-bound organellesb. they reproduce by simple mitosis c. the genetic material lies within a nuclear enveloped. the DNA is not associated with histone proteins

390. Which of the following is cyanobacteria?

a. E coli b. euglenac. oscillatoriad. volvox

391. What is the locomotory organelle of paramecium?

a. pseudopodiab. ciliac. flagellad. apical complex

392. The fungi body is called ____

a. thallus b. hyphaec. hymeniumd. stipe

393. The asexual spores of penicillium are called _____

a. conidiab. sporangiosporesc. ascosporesd. oospores

394. Which is not a fungus?

a. saprolegnia b. rhizopusc. agaricusd. selaginella

395. Which is not a characteristic of bryophytes?

a. exhibit alternation of generationb. form sporesc. form a zygote d. none of the above

396. In ferns, a sorus is cluster of ____

a. sporesb. sporangiac. meispores d. microsporangia

397. Which specimen produce seeds?

a. equisetum b. aspleniumc. pinusd. auricularia

398. Which characteristic is common to all plants?

a. produced seedsb. have sporophyte and gametophyte phasec. well developed vascular tissuesd. have roots for absorption

399. Which group comprises the parasitic flatworms?

a. turbellariansb. phasmideans c. trematodesd. hirudineans

400. Which structure is present to all adult enidarians?

a. medusab. polypc. nematocystd. exoskeleton

401. Birds and butterflies have wings which perform the same function but the two are notrelated. Why is this so?

a. because they belong to different phylab. because they have different food requirementc. because their wings function differentlyd. because their wings have no basic similarity in structure

402. In fishes, the gill pouches of the embryo develop into gills whereas in man, they Develop into structures of the

a. lungs c. liverb. heart d. throat

403. Which of the following is an example of morphological adaptation?

a. Bats feed during the night. b. The sunflower tends to face the sun.c. The turtle has thick shells for body covering.d. Gymnosperm do not shed off their leaves in autumn.

404. It is the Earth’s satellite

a. star c. jupiterb. moon d. sun

405. These kind of eclipses should not be viewed directly to avoid damage of the eye.

a. lunar eclipsesb. solar eclipses c. eclipsed. penumbra

406. Which of the following occurs when the sun is directly above the Earth’s equator?

a. equinox c. torrid zoneb. eclipse d. solstice

407. The tilting of the Earth as it revolves around the sun causes

a. changes seasons and climates b. changes of daysc. different phases of the moond. eclipses to occur

408. What do you call the clouds that indicate sunny weather?

a. cirrus c. cumulusb. stratus d. nimbus

409. What do you call for a cloud formation near the ground?

a. dew c. smog

b. rain d. fog410. Which of these causes the water to evaporate in the atmosphere?

a. wind c. gravityb. temperature d. sun

411. The following list can cause erosion except

a. running water c. insectsb. wind d. other animals

412. Every time a tree is cut, a young tree should be planted to replace it. This is called?

a. reforestation c. terracingb. planting d. farming

413. This condition described as the suddenly burning of a substance without any external heat source

a. radiation c. conductionb. spontaneous combustion d. boiling

414. What is the ability of matter to dissolve into other kinds of matter?

a. solubility c. colloidb. mix d. suspension

415. This is the process of the food making of the plants?

a. chloroplast c. proteinsb. photosynthesis d. mitosis

416. The green pigment of the plants?

a. pistil c. chloroplastb. vitamins d. plasma

417. The study of the plants is called?

a. Zoology c. Anatomyb. Nursing d. Botany

418. What is the fundamental hypothesis that has survived the test of time?

a. conclusion c. generalizationb. law d. theory

419. The study of the viruses is called?

a. Virology c. Ichthyologyb. Taxonomy d. Protozoan

420. The flow of the blood from the heart to the lungs and back to the heart is called?

a. pulmonary circulation c. circulatoryb. systematic circulation d. coronary circulation

421. What is the largest structure of the brain?

a. hemisphere c. cerebrumb. temporal lobes d. frontal lobes

422. The brain and the spinal cord received messages from the different parts of the body through?

a. connector nervesb. sensory nerves c. motor nervesd. spinal nerves

423. What is the study of cells?

a. cytology b. paleontologyc. pathologyd. conchology

424. Which of the following explains what a problem is?

a. It is a question for which you are trying to find an answer. b. It is an explanation of a difficulty.c. It is an answer to a certain question.d. It is a situation that requires mathematical computation.

425. Which of the following is stated as a problem?

a. How are you today?b. Which will weigh heavier the oil or alcohol.

c. Sometimes the sun can be seen from the sky. Sometimes it hides behind the clouds.

d. Oil and alcohol have different densities.

426. Which of the following will you use to know how many legs a grasshopper has?

a. direct observationb. reading books about animals.c. looking at pictures of animalsd. all of the above.

427. What is important to know if you have a problem?

a. Forget your problems.b. Write the problem.c. Try to know how to find the answer to the problem. d. Ask other people to help you solve the problem.

428. When you have a problem to solve, why is it very important to state it very clearly?

a. It is easy to read a clearly stated problem.b. It is easy to solve a clearly stated problem.c. It takes a much shorter time to find an answer to a clearly stated problem.d. It is easy to know exactly what you are trying to find out.

429. Why are science tools important in learning science?

a. Science tools help in discovering science deals ideas. b. Science tools are easy to handle.c. Science tools are inexpensive.d. Science tools provide fun and excitement.

430. Why are magnifying lenses very useful in observation?

a. Magnifying lenses give objects interesting colors.b. Magnifying lenses make close objects appear larger. c. Magnifying lenses are good for the eyes.d. Magnifying lenses make close objects appear smaller.

431. How does a telescope help in observation?

a. A telescope makes distant objects appear clear and big. b. A telescope is used only for watching stars.c. A telescope is usually situated in a higher place.

d. A telescope helps scientist discover more things about heavenly bodies.

432. Why is it not good to believe in superstitions?

a. Superstitions bring bad luck.b. Superstitions are associated with evil spirits.c. Superstitions are opinions and beliefs that are not proven by science. d. Superstitions originated from ancient people.

433. Why experimentation a very good way of finding out a solution to a problem?

a. Experiments are planned trials to use to see what happens under certain conditions.

b. Experiments are long procedures in solving problems.c. Experiments always start with a problem.d. Experiments use many tools and materials.

434. You want to observe the difference between the heights of two plants. Which tool do you need?

a. microscopeb. lensc. ruler d. platform balance

435. What is the manipulated variable?

a. variable to be tested b. variable to be rejectedc. variable to be acceptedd. variable to be changed

436. What is the sac that covered the heart?

a. myocardiumb. pericardium c. atriumd. semi lunar values

436. What is the swelling of the gums characterized with redness and bleeding?

a. dental carriesb. colitisc. gastritis

d. gingivitis

437. There are the common disorders of the digestive system except?

a. diarrheab. hemorrhoidsc. toothache d. dental carries

438. Digestion begins from the mouth and is completed at what part of the digestive system?

a. stomachb. pancreasc. small intestine d. large intestine

439. All of these causes digestive orders except?

a. poor eating habitsb. emotional stressc. eating spoiled foodd. eating the right kind of food

440. What is an enzyme which helps digest carbohydrates and proteins?

a. amylase b. ptyalinc. salivad. bile

441. What organ that closes to windpipe that prevents food from entering the lungs?

a. epiglottis b. esophagusc. salivary glandsd. pancreas

442. Which of these is a fluid comes from liver and stored in the gall bladder?

a. diarrheab. pancreatic juicec. bile d. Enzyme

443. The digested food is absorbed by the blood through the action of fingerlike structures called?

a. ptyalinb. pancreasc. biled. vili

444. How many muscles the muscular system made of?

a. 300b. 600 c. 400d. 100

445. What is male’s sex cells?

a. egg cells c. zygoteb. sperm cells d. gametes

446. What kind of satellites are now orbiting the Earth?

a. natural satellitesb. artificial satellites c. communications satellitesd. meteorological satellites

447. These are theories about origin of the universe except

a. Steady State Theoryb. Pulsating Theoryc. Big Bang Theory d. Theory of evolution

448. A light year is the distance light travels in one year. One light year is about

a. Six trillion kilometers b. Five trillion kilometersc. Three trillion kilometersd. Seven trillion kilometers

449. There are billions of galaxies in space. In which our solar system belongs?

a. Milky way

b. Andromeda galaxyc. Large Magellanic Cloudd. Small Magellanic Cloud

450. What are the substances that destroy pests or harmful organisms.

a. antisepticsb. pesticides c. preservativesd. additives

451. What kind of pesticides are used to kill weeds that disturb the growth of food crops?

a. herbicides c. biodegradable pesticidesb. fungicides d. insecticides

452. These are bad effects of rapid population growth, except

a. pollution and garbage problemb. food shortagec. housing problemd. contribute to flooding

453. The relationship of two organisms which benefits one organism and usually harms the other is called?

a. parasitism b. commensalismc. cutualismd. none of the above

454. What kind of organisms that eat both plants and animals?

a. omnivores c. carnivoresb. herbivores d. none of the above

455. There are also non living things in the pond such as water, sunlight, soil, stones and air.These are called

a. abiotic factors b. biotic factorsc. organismd. community

456. What is a term for an animal that a predator eats?

a. insect c. carnivoreb. prey d. wild animal

457. Which of these disrupt the food chain?

a. competitionb. ecosystemc. mutualismd. poisoning and overcrowding

458. Means not to exist anymore

a. lost c. extinctb. forgotten d. endangered

459. We can improve our environment by, except

a. control and prevention of diseasesb. population educationc. producing more garbage d. recycling of waste materials

460. The three common states of matter are

a. solid, liquid and gas b. wood, glass and rocksc. protons and neutronsd. none of the above

461. What is a substance made up of two or more elements combined chemically?

a. molecules c. plasticb. compound d. paper

462. Plasma is the fourth state of matter. It exists only in

a. a very low temperatureb. a standard temperaturec. a very high temperatured. none of the above

463. What is a synthetic material made from chemicals?

a. stone c. plasticb. metal d. paper

464. It is kind of energy that is present in all substances. It is released when a chemical reaction Takes place.

a. chemical energy c. kinetic energy b. mechanical energy d. electrical energy

465. What is the maximum or minimum speed permitted by law in a given area?

a. speed limitb. velocityc. motiond. force

466. Speeding up motion is called?

a. decelerationb. acceleration c. distanced. speed

467. Which layer of the earth is thickest?

a. mantle b. crustc. cored. none of the above

468. It connects a muscle to a bone, it joins calf muscle to the heel bone.

a. tendons b. jointc. cartilaged. ligaments

469. What does connect one bone to another?

a. tendonsb. jointc. cartilage

d. ligaments

470. It is a soft tissue that covers the end of a bone?

a. tendonsb. jointsc. cartilage d. ligaments

471. It is an uncontrolled shortening of one or more muscles?

a. torn musclesb. muscle strainc. muscle bruised. cramps

472. Whale is an example of?

a. mammals b. reptilesc. amphibiansd. none of the above

473. It is the study of reptiles?

a. Eugenicsb. Cytologyc. Ecologyd. Herpetology

474. It is a series of changes in form during the development of an animal from egg to adult?

a. life cycleb. metamorphosis c. fertilizationd. none of the above

475. It is the study of the relationship of the plants and animals in the environment?

a. Virologyb. Pathologyc. Ecology d. Botany

476. What is the female part of the plants?

a. pistil b. pollen grainsc. styled. stamen

477. It protects the flower while it is still a bud?

a. pistilsb. Ssepals c. stamend. stalk

478. It is the transfer of pollen from the anther to the stigma?

a. photosynthesisb. fertilizationc. pollination d. self-pollination

479. It is a method of exercising the muscles by pushing and pulling hard against another part of the body?

a. flexibilityb. endurancec. strengthd. Isometrics

480. It is caused by very tiny organisms that produce toxins?

a. red tide b. cholerac. dysenteryd. none of the above

481. What instrument used for measuring temperature?

a. anemometerb. thermometer c. barometerd. meter stick

482. What do you call the study of animals?

a. Biochemistry b. Conchology c. Ecology d. Zoology

483. What instrument used for measuring wind speed?

a. barometerb. anemometer c. wind milld. none of the above

484. The summary of the weather conditions in a specific place and time?

a. weather report b. weatherc. wind vaned. temperature

485. All of these are phases of matter except?

a. solidb. liquidc. gasd. elements

486. Tables, chairs, chalk and books are examples of?

a. gasb. liquidc. solid d. mixture

487. Juice, milk, iced tea and coffee are examples of?

a. gasb. liquid c. solidd. elements

488. Oxygen, hydrogen and nitrogen are examples of?

a. gas b. liquid

c. solidd. mixture

489. Which of the following is a fossil fuel?

a. coal b. firewoodc. coconut shelld. coconut husk

490. Which of these is a product of slow oxidation?

a. fireb. rust c. decayd. oxygen

491. What is the most common cause of fires?

a. matchstickb. petroleumc. candled. carelessness

492. Heat travels by?

a. Conductionb. Convectionc. Radiationd. All of the above

493. What are artificial ways of propagating plants?

a. Layeringb. Buddingc. Graftingd. all of the above

494. What is the study of tissues?

a. Eugenicsb. Histology c. Ecologyd. Botany

495. What is the study of internal organs of the body?

a. Anatomy b. Ichthyologyc. Paleontologyd. Pathology

496. What do you mean by the Latin word “bios”?

a. plantb. life c. lightd. animal

497. How many constellations do we have?

a. 14b. 16c. 12 d. 10

498. One hour is equivalent to how many minutes?

a. 45b. 60 c. 50d. 55

499. It is where the earth rotates?

a. orbital shellb. orbitc. axis d. none of the above

500. How far is the sun from earth?

a. 160 million kilometers b. 120 million kilometersc. 140 million kilometersd. 150 million kilometers

SCIENCE TODAY

Submitted by: RIMEL CHRISTIAN G.CALICDAN GRADE IV-B

Submitted to: MR. ERNIE V. PANGAN