3rd std science icse

Science practise paper

1. Write T for True and F for False, correct the false statement.

1. Sugar cane and potato store food in their roots. __

2. Tulsi is a medical plant.                                        __

3. Grapevine is an example of a tree.                       __

4. Tea leaves are used to make oil.                          __

5. Herbs have single non-woody stem.                   __

6. Coriander and mint are examples of climbers.    __

7. Climbers have weak stems and need the support of other plants.   __

8. Herbs are smaller than shrubs.                           ___

9. Water exits in only two forms.                             ___

10. When water boils, it turns into ice.                     ___

11. The process by which a solid changes into a liquid is called solidification.   ____

12. The process by which a liquid changes into a gas is called evaporation.     ____

13. When gas is heated, it changes into liquid.      ____

14. Many water droplets come together to form clouds.  ___

15. Water that is fit for drinking is called fresh water. ___

16. Rainwater harvesting can also be done by making canals. ____

17. Purifying drinking water with the help of chlorine tablets is called medication. ____

18. The sun gives us heat and light. ___

19. Energy from the Sun is used to produce wind energy. ____

20. Energy sources that last for a short time are called renewable sources of energy. ____

21. A pressure cooker uses the heat of the Sun for cooking food. ____

22. Energy from the Sun is used to produce solar energy. ____

23. The sun gives us air and water. ____

24. You should not keep the water geyser switched on all the time. ____

25. Water filters use different types of technologies and micro filters to remove germs. ____

26. The process of purifying drinking water with the help of chlorine tablets is called filtration. ____

27. The impurities that dissolve in water are called soluble impurities. ____

( B ) Name the following :-

1. The single woody stem of trees. ____________________________________________________    

2. Plants that grow along the ground. __________________________________________________

3. A seed that we eat. __________________________________________________

4. A beverage made from a part of a plant. ________________________________________________

5. Changing of water into ice. __________________________________________________

6. Changing of ice into water. __________________________________________________

7. Changing of water vapour into water. __________________________________________________

8. Changing of water into water vapour. __________________________________________________

9. Changing of water vapour into water droplets. __________________________________________

10. A method of collecting rainwater for later use. __________________________________________

11. The impurities that dissolve in water. __________________________________________

12. The impurities that do not dissolve in water. __________________________________________

13. Removal of harmful substances to make water fit for drinking. ___________________________

14. The simplest way of purifying drinking water. __________________________________________

15. The process of purifying water by adding chlorine. ______________________________________

16. A method of collecting and storing rainwater for later use. _______________________________

17. The cycle that involves the change of water into water vapour and then to water again.

       __________________________________________

18. The only star in our solar system. _________________________________________

19. The form of renewable energy. __________________________________________

20. The form of non-renewable energy. __________________________________________

21. The hottest season of the year. __________________________________________

( C )  Give two examples of the following :-

1. Trees - _________________________________. __________________________________________.

2. Herbs- _________________________________. __________________________________________.

3. Shrubs- ________________________________. __________________________________________. 

4. Medical plants - _____________________________. ______________________________________.

5. Leaves that store food - __________________________. __________________________________.

6. Soluble substances - __________________________. __________________________________.

7. Insoluble substances- __________________________. __________________________________.

8. Objects that stink in water - _______________________. __________________________________.

9. Objects that float in water- _______________________. __________________________________.

10. Forms of water- _______________________. __________________________________.

( D ) choose the correct option :-

1. _________________________ is an example of a tree.

   

      a. Mint          b. Grapevine          c. Spinach           d. Banyan 

2. _________________________  have many thin, woody stems near the ground.

      a. Herbs        b. Climbers         c. Shrubs          d. Trees

3. We eat the root of this plant.

      a. Banana        b. Tea          c. Radish          d. Orange

4. The seeds of this plant are used as a spice.

      a. Cherry         b. Potato       c. Mango         d. Mustard

5. We get oil from this fruit.

      a. Apple          b. Mango        c. Orange        d. Coconut

6. The process by which a gas changes into a liquid on cooling is called

     a. Evaporation      b. Condensation       c. Melting      d. Solidification 

7. The substance that dissolves is called a _________________ .

     a. Solute     b. Solvent      c. Solution         d. Mixture 

8. The process by which a liquid changes into a gas:

     a. Condensation       b. Freezing           c. Melting          d. Evaporation 

9. An example of a solute:

     a. Water        b. Sugar         c. Milk          d. Sugar solution

10. Which of these objects float on water?

     a. Key       b. Sponge           c. Marble        d. Stone

( E ) Choose the correct word to fill in the blank.

1. Potato and __________________ ( sugar cane/ carrot ) are examples of stems we eat.
2. We get tea, coffee and ___________________ ( sugar/ water ) from plants.
3. We get oil from _____________________ ( plants/paper ).
4. __________________ ( broccoli/ spinach ) is a leaf that we eat.
5. The leaves of ______________________ ( neem/ cardamom ) are used to make medicines.
6. Ice changes into water on ___________________ ( heating/ solidifying ).
7. Water vapour changes into water on ___________________ ( heating/ cooling ).
8. The process by which a liquid changes into a solid is called ____________________ ( melting/ solidification ).
9. The liquid in which a solute dissolves is called the _________________ ( solvent/ solution ).
10. _______________ ( water/ milk ) is called the universal solvent.
11. _________________ ( Sun/ Moon ) is a huge ball of very hot gases.
12. Solar geysers use __________________ ( Sun’s/ moon’s ) energy to heat water.
13. Human activities change due to the change of ____________________ ( seasons/ wind ).
14. Sun and water are ______________________ ( renewable/ non-renewable ) energy sources.

( F ) Match the following:

1. Chickpeas                 1. Medicine
2. Mustard                     2. Sugar cane
3. Sugar                        3. Oil
4. Neem                        4. Pulses

1. Evaporation                1. Strainer
2. Water filter                  2. Harvesting
3. Tea leaves                  3. Drying clothes
4. Condensation            4. Pure water
5. Rainwater                  5. Water droplets

1. Flower                       1. Herbs
2. Woody                       2. Cauliflower
3. Non woody stem       3. Cardamom
4. Spices                       4. Tea
5. Beverage                   5. Shrubs

1. Soluble substance         1. Key
2. Evaporation                    2. Sugar
3. Solution                          3. Liquid to gas
4. Insoluble substance       4. Solute + solvent

Write two examples of each of the following?

1	Trees
2	Shrubs
3	Herbs
4	Climbers
5	Creepers
6	Roots we eat
7	Stems we eat
8	Leaves we eat
9	Flowers we eat
10	Seeds we eat
11	Beverages

Write one difference and one similarity between climbers and creepers:

	Climbers	Creepers
Difference
Similarity

Complete the analogy

1. Mustard : Oilseed ;  ________________________ : Medicine.
2. ____________ : chocolates ;  sugarcane : jaggery.
3. Green gram : ________________ ;  rice : cereals.
4. Trees : trunk ;  ______________herbs .

Answer the following in one - two sentences each.

1. What type of stem do tree have?

Ans - _______________________________________________________________________________________

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2. What are oilseeds used for?

Ans - _______________________________________________________________________________________

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3. What are spices?

Ans - _______________________________________________________________________________________

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4. How is the sun useful to plants?

Ans - _______________________________________________________________________________________

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5. How are solar cells used as a source of electricity?

Ans - _______________________________________________________________________________________

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6. Give two examples of renewable and non-renewable sources of energy?

Ans - _______________________________________________________________________________________

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7. Define solute and solvent?

Ans - _______________________________________________________________________________________

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8. Name the solute and solvent present in sugar solution. Why is water called the universal solvent?

Ans - _______________________________________________________________________________________

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9. What is melting? Give one example.

Ans - _______________________________________________________________________________________

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10. What happens when you heat water in a pan over a stove?

Ans - _______________________________________________________________________________________

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11. What are impurities? Name two types of impurities.

Ans - _______________________________________________________________________________________

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12. Define water cycle?

Ans - _______________________________________________________________________________________

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13. Define insoluble impurities?

Ans - _______________________________________________________________________________________

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14. Give two examples of fruits that we eat.How are the stems of shrubs different from the stems of herbs?

Ans - _______________________________________________________________________________________

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15. Name three plants that are used to make medicines.

Ans - _______________________________________________________________________________________

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16. What is condensation ?

Ans - _______________________________________________________________________________________

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17. When a steel glass of ice-cold water is kept out in the open for some time, tiny droplets of water are seen on its surface. Why does this happen?

Ans - _______________________________________________________________________________________

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18. What is chlorination?

Ans - _______________________________________________________________________________________

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19. Define rainwater harvesting.

Ans - _______________________________________________________________________________________

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Answer the following questions in brief :-

1. Write a note on the edible parts of a plant mentioned below.

Ans  Stems- 

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Leaves -

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Roots -

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Flowers -

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Seeds -

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2. What are beverages ? Which part of plant is used to make beverages?

Ans. - _______________________________________________________________________________________

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3. Why are plants useful to us?

Ans. - _______________________________________________________________________________________

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4. Why should we not eat parts of some plants?

Ans. - _______________________________________________________________________________________

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5. Differentiate between renewable and non-renewable sources of energy.

Ans. - _______________________________________________________________________________________

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6. List any five ways in which you save energy?

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7. Explain the process of evaporation.

Ans. - _______________________________________________________________________________________

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8. Explain the process of solidification.

Ans. - _______________________________________________________________________________________

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9. Differentiate between soluble and insoluble substance.

Ans. - _______________________________________________________________________________________

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10. Explain different ways of purifying drinking water at home.

Ans. - _______________________________________________________________________________________

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11. Describe the method of rainwater harvesting with a suitbable sketch.

Ans. - _______________________________________________________________________________________

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12. Explain the process of melting.

Ans. - _______________________________________________________________________________________

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13. Explain the process of solidification.

Ans. - _______________________________________________________________________________________

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14. Differentiate between evaporation and condensation.

Ans. - _______________________________________________________________________________________

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15. What happens when we hold a lid over boiling water.

Ans. - _______________________________________________________________________________________

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Give scientific reason.

1. Roots of plants such as carrot, turnip, radish and beetroot are thick and fleshy.

Ans - _______________________________________________________________________________________

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2. Wet clothes dry faster in summer than in winter.

Ans - _______________________________________________________________________________________

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3. We can see droplets of water forming on the surface of a glass of cold milk or ice water.

Ans - _______________________________________________________________________________________

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complete the table given below:

Ice                                             water                                       vapour

Write two ways by which you can save energy in school :-

1.

2.

complete the table given below:

Uses of Solar Energy     

complete the table given below:

Types of Plants