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Class III – Science – Importance of Plants

A. Fill in the blanks:-

1. Plants are ____________ to us in many ways.

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Ans. Plants are useful to us in many ways.

2. Garlic and ginger plants are also used to make _____________.

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Ans. Garlic and ginger plants are also used to make medicines.

3. Plants give out __________ gas during day time.

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Ans. Plants give out oxygen gas during day time.

4. People who cut down trees should be ____________.

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Ans. People who cut down trees should be punished.

5. All living things need oxygen gas for ____________.

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Ans. All living things need oxygen gas for survival.

B. State true or false : –

1. We must protect plants to survive on the earth.

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Ans. True

2. Fallen leaves can be burnt.

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Ans. False

3. We should encourage deforestation.

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Ans. False

4. Only a few of us need to try to increase the number of plants and trees.

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Ans. False

5. Plants, give us food only.

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Ans. False

C. Tick the correct option.

1. They are an important gift of nature.

a) toys b) plants c) cars d) mobiles

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Ans. b) plants

2. Plants give us –

a) wool b) wood c) egg d) butter

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Ans. b) wood

3. Efforts need to be made to protect forests from –

a) fires b) rains c) air d) animals

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Ans. fires

D. Answer the following questions briefly: –

1. In which forms, do we get food from plants?

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Ans. We get food from the plants in the form of fruits, vegetables, pulses and grains.

2. How do plants help the soil?

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Ans. Plants bind the soil with the help their roots.

3. What is deforestation? Is it good or bad for all of us?

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Ans.  Cutting down of trees is called deforestation. It is bad for all of us.

E. Answer the following questions.

1. List any four uses of plants.

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Ans. Four uses of plants are:

  • Plants give us food.
  • It gives us oils and spices.
  • We get wood, paper and rubber from plants.
  • Some plants like Tulsi, neem, ginger and garlic are used to make medicine.

2. How do plants act as air purifiers?

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Ans. Plants give out oxygen gas during the day time. This helps to increase the amount of oxygen in the air and, thereby, purify it. Hence plants act as air purifier.

3. Suggest three ways that can help to conserve plants.

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Ans. Three ways that can help to conserve plants are:

  • We should promote afforestation, i.e., Planting new plants.
  • There should be punishment for those who cut down trees.
  • Let us not cut trees. We should use only those branches and leaves that have fallen down.