NCERT Solutions for Class 7 Science Chapter 17

Forests: Our Lifeline Class 7

Chapter 17 Forests: Our Lifeline Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 217

Q1 :  

Explain how animals dwelling in the forest help it grow and regenerate.


Answer :

The animals in forests are of various types. These could be herbivores, carnivores, micro-organisms, etc. These play an important role in maintaining the food chains.

(i) Micro-organisms convert the dead plants and animals to humus. This humus helps in returning the nutrients back to the soil. These are absorbed by plants.

(ii) The animals also help in dispersing the seeds of certain plants.

(iii) The decaying animal dung provides nutrients to various types of seedlings to grow.

All these activities of animals dwelling in the forest help it to grow and regenerate.

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Q2 :  

Explain how forests prevent floods.


Answer :

Forest acts as a natural absorber of water. It allows rain water to seep through. In the absence of trees, the rain water would hit the ground directly resulting in flood. However, because of the presence of trees, rain water does not hit the ground directly. It rather hits the ground slowly. Hence, before flooding, all the rain water seeps through ground. In this way, forests prevent floods.

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Q3 :  

What are decomposers? Name any two of them. What do they do in the forest?


Answer :

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Q4 :  

Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.


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Q5 :  

Explain why there is no waste in a forest.


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Q6 :  

List five products we get from forests.


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Q7 :  

List five products we get from forests.


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Q8 :  

Why should we worry about the conditions and issues related to forests far from us?


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Q9 :  

Explain why there is a need of variety of animals and plants in a forest.


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Q10 :  

In figure, the artist has forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels:

clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table


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Q11 :  

Which of the following is not a forest product?

(i) Gum

(ii) Plywood

(iii) Sealing wax

(iv) Kerosene


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Q12 :  

Which of the following statements is not correct?

(i) Forests protect the soil from erosion.

(ii) Plants and animals in a forest are not dependent on one another.

(iii) Forests influence the climate and water cycle.

(iv) Soil helps forests to grow and regenerate.


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Q13 :  

Micro-organisms act upon the dead plants to produce

(i) sand

(ii) mushrooms

(iii) humus

(iv) wood


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<< Previous Chapter 16 : Water: A Precious Resource Next Chapter 18 : Wastewater Story >>

Science : CBSE NCERT Exercise Solutions for Class 7th for Forests: Our Lifeline will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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