KENDRIYA VIDYALAYA DRDO,BENGALURU-93

CLASS - VI

SUBJECT- SCIENCE(H.HW.)

2021-22

Note: Write the answer of these questions.

Questions:

1. Classify the following habitats into terrestrial and aquatic types.

Grassland ,Pond ,Ocean ,Rice field.

2. Why is reproduction important for organisms?

3. What is a habitat?

4. Which of the things in the following list are non-living?

Plough ,Mushroom ,Sewing machine ,Radio ,Boat, Water hyacinth, Earthworm.

5. Explain the term ‘respiration`.

6. Paheli has a rose plant in her garden. How can she increase the number of rose plants in the

garden?

7. Why do desert snakes live in deep burrows during the day?

8. Mention one adaptation in the following animals:

(i) In camels to keep their bodies away from the heat of sand.

(ii) In frogs to enable them to swim.

9. Some desert plants have very small leaves whereas some others have only spines.How does

this benefit the plants?

10. How is cactus adapted to survive in a desert?

11. Which of the non-living things listed below, were once a part of a living thing?

Butter, Leather ,Soil ,Wool ,Electric bulb ,Cooking oil, Salt, Apple ,Rubber

12. How is a fish adapted to live in water?

13. How is the balance of carbon dioxide and oxygen maintained in nature?

14. What are the adaptive features of a lion that help it in hunting?

15. Distinguish between the following:

(i) biotic and abiotic components.

(ii) Predator and prey

KENDRIYA VIDYALAYA DRDO, BENGALURU – 93

SUBJECT – SCIENCE (H.H.W.)

CLASS -7

I. ANSWER THE FOLLOWING QUESTION.

1. Arrange the following statements in the correct order in which they occur during the formation and

removal of urine in human beings.

(a) Ureters carry urine to the urinary bladder.

(b) Wastes dissolved in water is filtered out as urine in the

kidneys.

(c) Urine stored in urinary bladder is passed out through

the urinary opening at the end of the urethra.

(d) Blood containing useful and harmful substances reaches

the kidneys for filtration.

(e) Useful substances are absorbed back into the blood

2. (a) Name the only artery that carries carbon dioxide-rich blood.

(b) Why is it called an artery if it does not carry oxygen-rich blood?

3. Name the process and the organ which helps in removing the following wastes from the body.

(a) Carbondioxide

(b) Undigested food

(c) Urine

(d) Sweat

4. Observe the given Figure and answer the given questions:

(a) Name the instrument.

(b) Label the parts A, B and C.

5. Match the parts of the heart in Column I with the direction of

flow of blood in Column II.

Column I Column II

(i) Right ventricle (a) Pushes blood into the pulmonary artery.

(ii) Pulmonary veins (b) Take deoxygenated blood from the heart to lungs.

(iii) Left atrium (c) Receives blood from different parts of the body.

(iv) Pulmonary arteries (d) Bring oxygenated blood from lungs to the heart.

(v) Left ventricle (e) Pushes blood into the aorta.

(vi) Right auricle (f) Receives deoxygenated blood from the pulmonary veins.

6. Fill in the blanks of the following paragraph using just two

words – arteries and veins.

___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon

dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have

thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow

blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into

extremely thin tubes called capillaries. The capillaries join up to form____ (h)_____.

7. In the figure of a flower given in Figure 12.4, label the parts

whose functions are given below and give their names.

(a) The part which contains pollen grains.

(b) The part where the female gamete is formed.

(c) The female reproductive part where pollen grains

germinate.

(d) The colourful part of flower which attracts insects

8. Fill in the blanks with correct terms.

The male and female gametes fuse to form a _____(a)______ during the process of _____(b)______.

This grows into an _____(c)______ which is enclosed within a seed. After fertilisation the ovules develop into

_____(d)______ and the ovary develops into a _____(e)______ .

9. Write how the following seeds are dispersed.

(a) Seeds with wings.

(b) Small and light seeds.

(c) Seeds with spines/hooks

10. Fungus, moss and fern reproduce by a common method of asexual reproduction. Name the

method.

KENDRIYA VIDYALAYA DRDO, BENGALURU – 93

SUBJECT – SCIENCE (H.H.W.)

CLASS - 8

I. ANSWER THE FOLLOWING QUESTION.

1. Explain the importance of reproduction in organisms.

2. Describe the process of fertilisation in human beings.

3. Give two differences between a zygote and a foetus.

4. Define asexual reproduction. Describe two methods of asexual reproduction in animals.

5. In which female reproductive organ does the embryo get embedded?

6. What is metamorphosis? Give examples.

7. Differentiate between internal fertilisation and external fertilisation.

8. Why do you think it is necessary for frogs and fish to lay so many eggs?

9. Write a brief note on IVF.

10. Define

a) Menarche

b) Menopause

c) Adolescence

11. In the list of animals given below, hen is the odd one out.

human being, cow, dog, hen

The reason for this is

(a) it undergoes internal fertilisation.

(b) it is oviparous.

(c) it is viviparous.

(d) it undergoes external fertilization

12. Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate

reason from the following.

(a) The animals are small in size and want to produce more offsprings.

(b) Food is available in plenty in water.

(c) To ensure better chance of fertilisation.

(d) Water promotes production of large number of gametes.

13. Mother gives birth to a baby but the baby has characters of both parents. How is this possible?

14. Fill up the blanks with the terms given below:

body, asexual, binary, single, nucleus

Amoeba is a ___________ celled organism. It reproduces by ___________ reproduction. The process of

reproduction begins by the division of its ___________ into two. This is followed by the division of its

___________ into two. This type of reproduction is called ___________ fission

II. Complete the crossword puzzle using the clues given below:

Across (†’)

1. The process of the fusion of the gametes.

6. The type of fertilisation in hen.

7. The term used for bulges observed on the sides of the body of hydra.

8. Eggs are produced here.

Down (†“)

2. Sperms are produced in these male reproductive organs.

3. Another term for the fertilised egg.

4. These animals lay eggs.

5. A type of fission in amoeba

HOLIDAY HOME WORK – AUTUMN BREAK 2021

KV DRDO BANGALORE

CLASS 9

SUB-SCIENCE

1. a) Define Avogadro’s number.

(1) b) Calculate the mass of 1.0505×1023 molecules of carbon di oxide (CO2).

1. c) Calculate the formula unit mass of Al2(CO3)3

(2) a) Write the structural formulae of

1. Aluminium Sulphate 2. Calcium chloride 3. Potassium sulphate 4. Potassium nitrate

5. Sodium oxide

2. b, State the six postulates of Dalton’s atomic theory.

(3) State the law with example.

(a) . Law of conservation of mass

b) Law of constant proportion . c) Define atomic mass unit

3. What is AIDS? Write the method of transmission of AIDS and the preventive

measures for this.

4. Write the chemical formula of these compound also find the molecular mass of the

compound.

a. Aluminium Chloride. b. Zinc Oxide. c. Potassium Nitrate. d. Barium Chloride . e.

Sodium Sulphate .f. Calcium Carbide . g. Ammonium Sulphate. h.Potassium

Permagnate . Alluminium Oxide . i. Nitrous Oxide . j. Ferric Oxide. k. Oxygen . l. Water

5. a. Ravi suffered from tuberculosis while Rehman suffered from typhoid. Which

disease caused more damage and why ?

b. What are the principles of treatment of a disease ?

c. Name two diseases for which the children below the age of one year should be

vaccinated.

d. What are symptoms shown by a person if

Lungs get infected

Stomach is infected ?

6. With diagram only depict the common methods of transmission of diseases.

7.a. Why is the weight of a body less at equator than at poles ?

b. A force of 20 N acts upon a body of weight 9.8 N. What is the mass of the body and

how much is its acceleration ( g = 9.8 m s-2)?

c. What do you understand by free fall ? Derive an expression for the acceleration due

to gravity. Write the factors on which “acceleration due to gravity” depends?

8.What are the Characteristics of Gravitational force?

9. Describe the role played by lysosomes. Why are these termed as suicide bags ?

How do they perform their function ?

10. Differentiate between

(i) Nucleus and nucleoid.

(ii) Plant cell and animal cell,

11. Derive the law of conservation of linear momentum.

OR

Total momentum of two bodies remains unchanged before and after the collision.

Justify this statement.

12. Identify the following muscular tissues and draw their diagrams :

(a) This tissue is mostly attached to bones and helps in body movements.

(b) This tissue is found in the iris of eye and bronchi of lungs.

(c) This tissue contracts and relaxes rapidly and rhythmically throughout life.

13. Draw a labelled diagram of section of phloem. Name the four types of elements

found in phloem. With respect to conduction, what is the main difference between

xylem and phloem

14. (a) How many neutrons are present in C-14 isotope of carbon ?

(b) How many protons does He2+ ion possess ?

(c) How many electrons can be filled in the third orbit of an atom at the maximum ?

(d) An element is represented as 8X16.

Find : The number of electrons in element X. .

Mass number of an element X.

The number of neutrons in element X.

Read carefully and answer

Mitochondria and Chloroplast Mitochondria and Chloroplast -both are energy transformers of

cells mitochondria = cellular respiration chloroplast = photosynthesis -both are not part of the

endomembrane system -most of their proteins are synthesized by the free ribosomes in the

cytosol -a few of the proteins are synthesized from their own ribosomes -both organelles

contain small quantity of DNA that direct the synthesis of polypeptides produced by the

internal ribosomes -both organelles grow and reproduce as semiautonomous organelles

Mitochondria -1-10 µm long -some cells contain a single large mitochondrion but most cells

contain several mitochondria -enclosed by two membrane: outer and inner membrane with

different permeability -cristae = fold of inner-membrane to increase the surface area -matrix

and intermembrane space -inner-membrane of mitochondria contains: -electron transport

chain -ATP synthase The energy from catabolism in the matrix is converted into ATP.

Chloroplast -is one of the generalized plant structure called plastids -found in mesophyll cells

of the leaves and in algae -2-4 µm wide and 5-10 µm long

Question 1.(a) Which two organelle are named as ‘semi autonomous? ---------------------- -----

----------------- (b) How will you justify this term for them? -----------------------------------------

-----------------------------------------------------

Question 2. Observe the diagrams given above and write the difference between the inner

membrane of Mitochondria and Chloroplast. ----------------------------------------------------------

-------------------------------------------------

Question 3. The organelle of endomembrane system can be- (a) Chloroplast (b) Nuclear

membrane (c) Endoplasmic reticulum (d) Lysosomes

Choose the correct option- (i) Only a (ii) a and c (iii) b and c (iv) b, c and d

PROJECTS ( ONE PROJECT MANDATORY FOR ALL) TO SUBMIT

1.Collect and analyse wide variety of graphs from newspapers, magazines or the

internet. Analyse and interpret the graphs(for example, distance-time, speed-time, or

acceleration-time graphs of motion of a vehicle on a straight road)

2. Observe various technological devices and innovative exhibits such as waste

management kits, water filtration system, using low-cost or no-cost eco- friendly

materials, develop them and showcase it in science exhibitions, clubs and parent-teacher

meets.

3. Designs models using eco-friendly resources, such as, 3D model of a cell/ water

purification system/stethoscope, etc.

4.Do the survey on any one communicable disease. Prepare your survey report that you

have done.

HOLIDAY HOME WORK – AUTUMN BREAK 2021

KV DRDO BANGALORE

CLASS 10

SUB-SCIENCE

1. When a cell reproduces, what happens to its DNA?

2. Na, Mg and Al are the elements of the 3rd period of the Modern Periodic Table having group

number 1, 2 and 13 respectively. Which one of these elements has the (a) highest valency,

(b) largest atomic radius, and (c) maximum chemical reactivity? Justify your answer stating

the reason for each.

3. (a) Write the functions of each of the following parts in a human female reproductive

system:

(i) Ovary

(ii) Uterus

(iii) Fallopian tube

(b) Write the structure and functions of placenta in a human female.

4. A student focuses the image of a candle flame, placed at about 2 m from a convex lens of

focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens

and each time focuses its image on the screen.

(A) In which direction does he move the lens to focus the flame on the screen?

(B) What happens to the size of the image of the flame formed on the screen?

(C) What difference is seen in the intensity (brightness) of the image of the flame on the

screen?

(D) What is seen on the screen when the flame is very close (at about 5 cm) to the lens?

5. List two different functions performed by pancreas in our body.

How it can be proved that the basic structure of the Modem Periodic Table is based on the

electronic configuration of atoms of different elements?

6. The electronic configuration of an element is 2, 8, 4. State its :

(a) group and period in the Modern Periodic Table.

(b) name and write its one physical property

7 The growing size of the human population is a cause of concern for all people. The rate of birth in a

given population will determine its size. Reproduction is the process by which organisms increase

their population. The process of sexual maturation for reproduction is gradual and takes place while

general body is still going on. Some degree of sexual maturation does not necessarily mean that

mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive

devices are being used by human beings to control the size of population.

(a) List two common signs of sexual maturation in boys and girls.

(b) What is the result of reckless female foeticide?

(c) Which contraceptive method changes the hormonal balance of the body?

(d) Write two factors that determine the size of a population.

8 (a) A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List

two possible reasons due to which this defect of vision may have arisen. With the help of ray

diagrams, explain

(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.

(ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by

the use of this lens.

(b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power

of the lens as per the new Cartesian sign convention.

9 For question numbers i, and ii , two statements are given- one labelled Assertion (A) and the

other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c)

and (d) as given below:

a) Both A and R are true, and R is correct explanation of the assertion.

b) Both A and R are true, but R is not the correct explanation of the assertion.

c) A is true, but R is false.

d) A is false, but R is true.

i. (A ) . Assertion: After white washing the walls, a shiny white finish on walls is obtained after two to

three days.

(R) . Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which

gives shiny white finish.

ii. (A) . Assertion: A geneticist crossed a pea plant having violet flowers with a pea plant with white

flowers, he got all violet flowers in first generation.

(R ) Reason: White colour gene is not passed on to next generation.

10. (a) List the three different between ammeter and volt meter in a tabular

form?

(b) Explain why conductors offer resistance to the flow of current?

(c) In a household , 5 tube lights of 40 W each are used for 10 Hrs and an electric press 500 W for 4 Hrs every day . Calculate the total energy consumed by the tube lights and press in a months of 30 days?

11.(a) Why does menstruation occur?

(b) What are the functions performed by the testis in human beings?

(c) Draw a labelled diagram of the longitudinal section of a flower.

12. A cloth strip dipped in onion juice is used for testing a liquid ‘X’. The

liquid ‘X’ changes its odour. Which type of an indicator is onion juice ?

The liquid ‘X’ turns blue litmus red. List the observations the liquid ‘X’

will show on reacting with the following :

(a) Zinc granules

(b) Solid sodium carbonate

Write the chemical equations for the reactions involved.

13. State with reasons the mode of connecting all electrical appliances

in common domestic electric circuits.

(b) Which two separate circuits are often used in domestic electric

circuits and why ?

(c) When does an electric short circuit occur ? How can it be

prevented ?

14. (a) Why is nutrition necessary for the human body ?

(b) What causes movement of food inside the alimentary canal ?

(c) Why is small intestine in herbivores longer than in carnivores ?

(d) What will happen if mucus is not secreted by the gastric glands ?

PROJECT BASED COMPULSORY ONE PROJECT FOR EVERY ONE

1.Collect wide variety of graphs from newspapers, magazines, or the internet, with a view to

understand the information contained therein. The learners may be facilitated to draw a

graph, such as V-I graph for analysing the relationship between the potential difference

across a conductor and the current through it.

2. Collect eco-friendly, commonly available materials to design and develop technological

devices and innovative exhibits, such as, electric motor, soda acid fire extinguisher,

respiratory system, etc. All have to display their exhibits or models in science exhibitions,

science club, classrooms, during parent-teacher meet and to respond to the queries raised

during interaction.

3. Design models using eco-friendly resources such as, working model of respiratory/

digestive/ excretory systems/soda acid fire extinguisher/periodic table/electric motor/

generator, etc