Class 7 Science
Forests: Our Lifeline
Q1.
Explain how animals dwelling in the forest help it grow and regenerate.
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Q2.
Explain how forests prevent floods.
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Q3.
What are decomposers? Name any two of them. What do they do in the forest?
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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.
Fill in the blank:
(a) The insects, butterflies, honeybees and birds help flowering plants in _____________.
(b) A forest is a purifier of _____________ and _____________.
(c) Herbs form the _____________ layer in the forest.
(d) The decaying leaves and animal droppings in a forest enrich the _____________.
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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.
Which of the following is not a forest product?
(i) Gum
(ii) Plywood
(iii) Sealing wax
(iv) Kerosene
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Q11.
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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Q12.
Micro-organisms act upon the dead plants to produce
(i) sand
(ii) mushrooms
(iii) humus
(iv) wood
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Q.13
Micro-organisms act upon the dead plants to produce
(a) sand
(b) mushroom
(c) humus
(d) wood
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