Forests - Our Lifeline Class 7 Worksheet Science Chapter 12

Q.1. Fill in the blanks.
(i) The insects, butterflies, honeybees and birds help flowering plants in _____________.
(ii) A forest is a purifier of _______ and ______ .
(iii) Herbs form the _______ layer in the forest.
(iv) The decaying leaves and animal droppings in a forest enrich the _______.

Q.2. State True (T) or False (F).
(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. __________

Q.3. What is the effect of deforestation on soil?

Q.4. Why does the forest floor seem to be dark-coloured?

Q.5. What is canopy?

Q.6. What are known as understoreys in forest?

Q.7. In which layer of the soil would you find humus? What is its importance to the soil?

Q.8. Why does the forest floor seem to be dark-coloured?

Q.9. Why raindrops do not hit the forest floor directly?

Q.10. Why forests are called green lungs?

Q.11. Why are forests disappearing?

Q.12. Explain the importance of forest.

Q.13. Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.

Q.14. What are decomposers? Name any two of them. What do they do in the forest?

Q.15. Why does deforestation increase carbon dioxide in the atmosphere?

Q.16. Explain why forest is called “the dynamic living entity”?

Q.17. Explain why there is no waste in a forest.

Q.18. Explain how forests prevent floods.

Q.19. Why should we worry about the conditions and issues related to forests far from us?

We should worry about the conditions and issues related to forests far from us because:

Q.20. Explain how forest affects our food chain.

You can find Worksheets Solutions here: Worksheet Solutions: Forests - Our Lifeline