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Revision 1

Q1. Which of the following statements is true?

A. A cell is the basic unit for animals only.

B. A multicellular organism has more than one cell in its body.

C. Plant cells and animal cells only differ in terms of cell wall.

D. A unicellular organism does not need a nucleus to function.

Plants and animals are examples of multicellular organisms. They contain

millions of cells in their body.

Q2. Which of the following characteristics is true for cell walls?

A. They restrict the movement of substances across the cell.

B. They support the cellular structure in animal cells from bursting when water enters

the cell excessively.

C. They are made up of cellulose that cannot be digested by animals easily.

D. They are found in some animal cells.

Extra: They are the fibres in our diets to help our bowel movement.

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Q3. What is the name of the system that consists of brain and spinal cord in human

beings?

A. The reproductive system B. The digestive system

C. The circulatory system D. The nervous system

Nervous system

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Q4. Which of the following organs are parts of the respiratory system?

A. heart and blood vessels B. sperm duct and penis

C. trachea and bronchi D. mouth and oesophagus

Q5. Which of the following organelles are collectively called protoplasm?

A. Chloroplast, nucleus, cell wall B. Cell wall, cell membrane, nucleus

C. Nucleus, cell membrane, cytoplasm D. Cell wall, cell membrane,

Protoplasm is the living contents of a cell that is surrounded by a plasma

membrane. Cell wall is not part of the protoplasm. Animal has protoplasm but

no cell wall.

Q6. Which of the following organelles in a cell allows energy transformation from

chemical energy to heat energy to take place?

A. Nucleus B. Cytoplasm C. Chloroplast D. Cell membrane

Cytoplasm is the site where chemical processes in the cell take place.

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Q7. Which of the following terms correctly describes a group of organ systems that

performs similar tasks in a systematic and coordinated manner?

A. Organs B. Organ systems C. Organism D. Cells

Structure Characteristics Examples

Tissue A large number of similar

cells performing a particular

function

Plants: Epidermal tissue, photosynthetic

tissue, supporting tissue

Animals: Epithelial tissue, muscle tissue,

nerve tissue

Organ Two or more tissues grouped

together, carrying out the

same function.

Heart (muscle, blood and connective

tissues)

Brain (nerve and connective tissues)

System Two or more organs working

together in the same function

Digestive, circulatory, nervous,

respiratory, excretory, reproductive

system

Q8. Which of the following animals cannot control over their own body temperature?

A. Chimpanzees B. Chameleons C. Hummingbirds D. Rodents

Cold-blooded animals cannot control their body temperature. Chameleons are

reptiles.

Fish Amphibians Reptiles

They are cold blooded

and live in water.

Their bodies are

covered with slimy scales.

They have gills for

breathing.

They have fins for

swimming.

They are cold blooded.

They have moist skin

which is not covered by

scales or hair.

They live on both land

and water but always lay

their eggs in water.

They have four legs.

They are cold blooded.

They have leathery skin

which is covered with dry

scales.

They always lay their

eggs on land.

Their eggs have soft

shells

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Birds Mammals

They are warm blooded.

Their bodies are covered with feathers.

They have beaks (no teeth) for

feeding.

They lay eggs with hard shells

They are warm blooded.

Their bodies are covered with hair or

fur.

Mothers produce milk for their babies

(suckle their young).

Q9. The descriptions of a plant kingdom are as follows:

I. Non-flowering II. Reproduce by seed Ill. Growth on land

What could be this plant kingdom?

A. Ferns B. Conifers C. Mosses D. Hibiscus

Conifers reproduce by seeds.

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Mosses

Conifers Ferns

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Q10. Which of the following characteristics can be observed in hibiscus and rose?

A. Both reproduce by spores. B. Both do not have true roots.

C. Both have stems and leaves. D. Both have spores in the capsules.

Both are flowering plants. They have true roots, stems and leaves.

Q11. Which of the following is one of the characteristics for conifers?

A. They have needle-like leaves. B. They have spores under their leaves.

C. They are flowering-plants. D. They do not have true roots.

They also reproduce by seeds.

Conifers leaves

Q12. Which of the following organisms does not have true roots but makes its own

food?

A. Mushroom B. Moss C. Fungi D. Conifer

They can carry out photosynthesis.

Q13. Which of the following groups of animals are all vertebrates?

A. Tiger, starfish, rabbit B. Monkey, rat, roundworm

C. Zebra, dolphin, rat D. Ant, crab, starfish

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Q14. Which of the following characteristics cannot be used to describe millipedes?

A. Have no backbones B. Have more than three pairs of legs

C. Have jointed legs D. Have soft and moist exoskeleton

Millipedes have hard and dry exoskeleton

Q15. An organism has the following characteristics.

I. Breathe through lung II. Have hair III. Give birth to young

Which of the following organisms fits the above characteristics?

A. Crocodiles B. Salamanders C. Stingrays D. Giraffe

Salamanders

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Stingrays

Q16. The diagram below shows an apparatus used to investigate osmosis.

After a few hours, which changes in levels will occur and which substances will move

across the membrane?

Level M Level N Substance

A. Fall Rise Starch

B. Fall Rise Water

C. Rise Fall Starch

D. Rise Fall Water

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Starch solution has a lower concentration of water, water will move across the

Visking tubing into the starch solution.

Q17. Which statement best explains why gases move across the stomata of green

leaves during warm and sunny day?

A. The gases gain energy which cause them to move more randomly and vigorously.

B. The gases expand. As a result, they move out from the stomata to occupy more

spaces.

C. The gases are warmed. As a result, their densities decrease and they rise up

D. The gases have different concentrations inside and outside of the leaves.

Questions 18 and 19 refer to the diagram below. It shows a typical plant cell after

being placed in a beaker of salt solution for 10 minutes.

Q18. What could be the concentration of the salt solution in the beaker?

A. 5% salt solution B. 15% salt solution

C. 20% salt solution D. 25% salt solution

The concentration of salt solution must be higher in the beaker than in the cell,

so that water molecules move out from the cell. The diagram shows a

plasmolysed plant cell.

Q19. Which process is involved to cause this observation of the cell?

A. Osmosis B. Diffusion C. Expansion D. Active transport

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Osmosis is the movement of water molecules from the region of higher water concentration to a region of lower water concentration through a partially permeable membrane.

Diffusion is the spreading out of one substance through another due to the

random motion of particles.

Q20. Which of the following is one of the functions of blood capillaries?

A. Allow osmosis of oxygen B. Allow diffusion of glucose

C Transport oxygen gas D. Transport plasma

Blood capillaries allow exchange of substances between bloodstream and the living

cells.

Oxygen and useful nutrients move out from the bloodstream into the living cells.

Waste products such carbon dioxide leave the living cells and enter the bloodstream.

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Q21. Which statement best explains why red blood cells have biconcave shape?

A. To transport more carbon dioxide B. To contain more cytoplasm

C. To decrease its density D. To increase the rate of oxygen exchange

Red blood cell has a biconcave disc shape to increase surface area to volume

ratio for efficient transportation of oxygen.

Q22. The diagram below shows part of a root hair cell.

Which of the following will take place?

A. Salt will move into the root hair cell from the soil through active transport.

B. Osmosis of water will not take place.

C. Cytoplasm of the cell will change in its volume.

D. No passive movement of substances will take place between the soil and the root

hair cell.

Cytoplasm will decrease in its volume because water molecules move out from

the cell into the surrounding by osmosis.

Q23. Which of the following substances is not transported by plasma?

A. Carbon dioxide B. Glucose C. Heat D. Oxygen

Oxygen is transported by red hood cells.

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Q24. The diagram below shows a simplified diagram of blood circulation in a

mammal.

Which blood vessels transports blood with the highest oxygen content?

A. 1 and 2 B. 2 and 4 C. 1 and 3 D. 3 and 4

Q25. Which statement about the movement of substances across the living cells is

not correct?

A. The direction of the movement of one substance depends on the concentration of

the other substance.

B. No energy is required when a substance moves down its concentration gradient

C. Active transport will take place when mineral salts become scarce in soil.

D. Osmosis can only take place if cell membrane is present in the living cells

The movement of one substance from one region to another depends on its

own concentration gradient iii different regions.

Q26. The diagram below shows a typical root hair cell.

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Which substance does not moves across the cell membrane by simple diffusion

during respiration?

A. Oxygen B. Carbon dioxide C. Glucose D. Excess water

This movement of water across the cell membrane is known as osmosis.

Q27. An onion layer loses its mass after placing in a beaker of solution for a period

of time. Which of the following is not possible to be the solution in the beaker?

A. Pure distilled water B. Pure starch solution

C. Pure glucose solution D. Pure mineral salt solution

Pure distilled water has the highest concentration of water molecules,

therefore, there will he net movement of water molecules into the onion cells

to cause them to gain mass.

Q28. The diagram below shows an experiment to investigate the movement of

substances.

Which of the following most likely will not happen to the respective regions 1, 2 and 3

at the end of the experiment?

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A. Region 1 increases in volume.

B. There are same numbers of glucose molecules in these three regions.

C. Regions 2 and 3 have equal volume.

D. Blue-black observed in region 3 when two drops of iodine is added to it.

Starch cannot move across the partially permeable membrane.

Q29. Which statement best explains why the muscular walls of veins is thinner than

that of arteries?

A. They carry deoxygenated blood.

B. They carry smaller volume of blood.

C. They carry less substance in blood.

D. They carry blood that flows slower in the vessels.

Blood flows with a lesser pressure in the veins, so the speed of the blood is

slower. Therefore, it does not require a thicker wall to withstand the low

pressure.

Q30. The diagram below shows the effect of solution Y on a red blood cell after half

an hour.

Which statement is not correct from this observation?

A. Solution Y contains a higher concentration of solute than in the red blood cell

B. The cell membrane of this red blood cell eventually will break apart.

C. The red blood cell is said to be dehydrated.

D. The red blood decreases in its volume and becomes soft.

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The red blood cell shrinks. The appearance of thin red blood cell indicates that

it loses water by osmosis. Therefore, the cell membrane will not burst.

Hypotonic solution means dilute solution or less concentrated solution

Hypertonic solution means concentrated solution or solution with little water.

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Q31. Which of the following is not one of the differences between a red blood cell

and a white blood cell?

A. Presence of haemoglobin B. Presence of nucleus

C. Presence of cytoplasm D. Presence of chromosomes

White blood cells and red blood cells both have cytoplasm.

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Q32. The diagram below shows the structure found in a typical human cheek cell.

Which statement about this structure is correct?

A. They restrict the movement of any substances across it by their masses.

B. Water is the only substance that its direction of movement depends on the

presence of this structure.

C. It only allows the substances to move from its region of higher concentration to its

region of lower concentration.

D. It is present in a typical plant cell but is made of cellulose

Osmosis takes place. A partially permeable membrane does not prevent active

transport of a substance.

Q33. Which of the following movements of substances is not an example of diffusion

in plants?

A. Oxygen is given out to the surroundings through the stomata after photosynthesis.

B. Mineral salts are taken in by root hair cells when they have a lower concentration

in soil.

C. Water vapour is lost from the leaves through stomata during a warm and sunny

day.

D. Food is transferred from the leaves to the various parts of the plant after

photosynthesis.

Active transport is a process when a substance moves from its region of low

concentration to its region of high concentration against a concentration

gradient. Energy is involved.

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Q34. Which of the following components transport substances in the circulatory

system?

I. Plasma II. White blood cells Ill. Red blood cells

A. I only B. Ill only C. I, II and Ill D. I and Ill

White blood cells do not transport substances. They only fight against

infections.

Q35. Which of the following is not one of the differences between an artery and a

vein?

A. Compositions of blood B. The size of lumen

C. Thickness of muscular wall D. Blood flow pressure

Blood flow in both vessels contains the same compositions, i.e. plasma, red

blood cells, white blood cells and platelets.

Q36. The diagram below shows a section from the plant root after taken out from a

red dye solution. Which structure most likely transports substance made in the green

leaves?

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D. This diagram shows the section from the root. The structure which is

stained red is a xylem vessel because xylem vessels transport water

containing the red dyes. Option D is phloem.

Q37. The diagram below shows part of the human circulatory system.

Which substance occurs at a higher concentration in the blood flow 1 than in the

blood flow 2?

A. Oxygen B. Carbon dioxide C. Nitrogen D. Glucose

Blood floss from the lungs to the heart has the highest oxygen concentration

after picking up fresh oxygen front the atmosphere.

Q38. Which of the following blood vessels most likely contains the highest

concentration of dissolved oxygen in the blood vessels?

A. Pulmonary artery B. Pulmonary vein C. Aorta D. Renal artery

Pulmonary vein receives fresh oxygen from the lungs.

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Q39. The diagrams show three types of blood vessels, 1, 2 and 3.

Which of the following describes the characteristics for each type of vessel?

Blood flow under

high pressure

Location of exchange

of substances

Blood flow

controlled by valves

A. 1 2 3

B. 3 1 2

C. 2 3 1

D. 1 3 2

Arteries

Veins

Capillaries

Function carry blood away from

the heart

carry blood towards the

heart

allow exchange of

substances between

blood and the body

cells

Structure Thick, elastic and

muscular wall

Thin, less elastic and

less muscular wall

One-cell thick to allow

substances can

diffuse to and from the

cells

Valves Absent Present Absent

Blood

flow

Very fast as blood is

under high pressure

In spurts

Slow as under low

pressure

Smooth flow

Slow as under low

pressure

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Size of

lumen

Small Large Very narrow

Q40. Which of the following is the correct pathway for blood circulation in human?

A. Right atrium left atrium left ventricle lungs right ventricle

B. Lungs left atrium left ventricle right ventricle right atrium

C. Left ventricle right atrium right ventricle lungs left atrium

D. Lungs left ventricle left atrium right ventricle right atrium

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Q41. A plant was placed in jar as shown below. The condition was suitable for the

plant to make food, as there was sunlight and the soil was moist. The air inside the

jar contained carbon dioxide gas which is made up of radioactive carbon element.

The carbon from the gas was incorporated into food during photosynthesis.

After two hours, the plant was removed from the jar. The stem was cut cross-

sectional. It was then placed on photographic film which became black when

exposed to radioactivity. Which diagram shows the correct positions of the black

spots found on the film?

A. The black spots should only be observed in phloem tissues as they transport food

substances.

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Q42. The diagram below shows a human heart and

its attached vessels.

Which of the following correctly describes the

conditions of the blood in the different vessels?

P Q R S

A Oxygenated,

high pressure

Deoxygenated,

low pressure

Deoxygenated,

high pressure

Oxygenated,

high pressure

B Deoxygenated,

high pressure

Deoxygenated,

low pressure

Oxygenated,

high pressure

Oxygenated,

high pressure

C Deoxygenated,

low pressure

Deoxygenated,

low pressure

Oxygenated,

high pressure

Oxygenated,

high pressure

D Oxygenated,

high pressure

Deoxygenated,

high pressure

Deoxygenated,

low pressure

Deoxygenated,

low pressure

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Q43. The diagram below shows part of the human alimentary canal

What is the function of X?

A. To remove solid waste from the body B. To absorb water into body

C. To take in mineral salts into the body D. To store solid waste temporarily

It is a rectum.

Q44. Which of the following is not one of the end products of digestion in the small

intestine?

A. Fatty acids B. Short protein chains

C. Glycerol D. Glucose

Proteins are broken down into short protein chains in the stomach. In the

small intestine, they are further digested into amino acids.

Q45. Which of the substances is taken into the bloodstream when it reaches the

large intestine?

A. Vitamins B. Glucose

C. Amino acids D. Fatty acids and glycerol

Large intestine absorbs mineral salts, vitamins and water. Note that no

chemical digestion takes place in large intestine.

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Q46. The diagram below shows part of the human alimentary canal.

What would happen when part P is removed?

A. Digestion of fats becomes slower

B. No production of bile in the digestive system

C. No secretion of lipase

D. No secretion of hydrochloric acid

Bile breaks up fats into droplets to increase its total surface area so that lipase

can digest them at a faster rate. Bile is produced by the liver. Structure P is

bile duct. The bile secreted by the liver passes through a Y-shaped duct, as

shown in Figure. The bile travels down one branch of the Y shaped duct and

then up the other branch to the gallbladder, a saclike organ that stores and

concentrates bile.

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Q47. Which chemical digestion takes places in the beginning of the human

alimentary canal?

A. Complex protein molecules are broken down into smaller protein molecules.

B. Large and complex food is broken into smaller pieces by the action of chewing.

C. Food is pushed down into the stomach by a long muscular tube.

D. Large and complex starch in food is broken down into maltose.

Starch is digested first in the mouth by salivary amylase. Salivary amylase is

released by the salivary glands.

Q48. Which of the following statements about starch and glucose is correct?

A. They both contain the constituent elements of carbon, hydrogen and oxygen only.

B. Starch can provide twice the amount of energy than glucose in a same amount of

mass.

C. Starch gives blue--black colour with iodine after mixed with salivary amylase.

D. Glucose is the first carbohydrate that is broken down in the mouth of the human

alimentary canal.

Glucose and starch are carbohydrates. Fats are also made up of elements

carbon, hydrogen and oxygen only.

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Q49. The diagram below shows the movement of substances in a muscular tube.

Which of the following regions in the human alimentary canal can this movement be

found?

I. Oesophagus II. Mouth III. Large intestine

A. I only B. II only C. I and Ill D. II and Ill

As you can see in Figure, alternating contractions

of these muscle layers push the bolus through

the esophagus and into the stomach. This series

of rhythmic muscular contractions and

relaxations is called peristalsis.

Peristalsis is so efficient at moving materials

down the esophagus that you can drink while

standing on your head.

The smooth muscles move the water “up” the

esophagus, against the force of gravity.

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Q50. Which of the following does not secrete enzymes in the human alimentary

canal?

A. The liver B. The small intestine

C. The pancreas D. The stomach

Liver secretes bile.

Q51. The diagram below shows part of the human alimentary canal.

Which statement about structure P is not correct?

A. It is part of the human alimentary canal which carries out chemical digestion of

food

B. Digestion of fatty food substances can only be carried out from the secretion of P.

C. Protease from structure P digests the smaller protein molecules into amino acids.

D. Maltase secreted by structure P completes the digestion of starch into glucose.

P is pancreas. It is an organ associated to alimentary canal but it is not part of

it. It does not carry out chemical digestion. Chemical digestion is carried out in

the small intestine.

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Q52. The diagram below shows part of the human alimentary canal.

Which of the following actions does not take place in structure M?

A. Killing bacteria in food B. Breaking down proteins chemically

C. Absorption of amino acids D. Churning action on the digested food

Absorption of simpler food molecules only takes place in the small intestine.

Q53. Which statement best explains why fibres are not taken into the bloodstream in

the small intestine?

A. Fibres are too heavy to move through the wall of the small intestine.

B. Fibres do not have any useful functions in our body, so they are not being

absorbed.

C. Fibres are not able to move across the partially permeable membrane present in

the wall of the small intestine.

D. Fibres cannot move against its concentration gradient from the lumen of the small

intestine into the bloodstream.

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Q54. The diagram below shows the human alimentary canal.

Which regions show the enzyme activities?

A. 1 and 4 B. 1, 3 and 5 C. 2, 3 and 5 D. 1, 2 and 4

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The Human Digestive System. Food breaks down as it moves through the

chambers of the digestive tract. Accessory organs aid in digestion.