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Important questions based on NCERT syllabus for Chapter 17 - Forests: Our Lifeline:
Question-1: Define forest.
Solution: A forest is a large area of land covered with trees or other woody vegetation. Forests are the dominant terrestrial ecosystem of Earth, and are distributed across the globe. Forests account for 75% of the gross primary productivity of the Earth's biosphere, and contain 80% of the Earth's plant
Question-2: What would happen if it rains heavily in your town? How does forest affect rain?
Solution: The forest acts as a natural absorber of rainwater and allows it to seep. It helps maintain the water table throughout the year. Forests not only help in controlling floods but also help maintain the flow of water in the streams so that we get a steady supply of water. On the other hand, if trees are not present, rain hits the ground directly and may flood the area around it. Heavy rain may also
damages the soil. Roots of trees normally bind the soil together, but in their absence the soil is washed away or eroded
Question-3: There are so many forests in India. What difference will it make if we cut some trees for a factory?
Solution: You have read about autotrophs, heterotrophs and saprotrophs. You have learnt how green plants produce food. All animals, whether herbivores or carnivores, depend ultimately on plants for food. Organisms which feed on plants often get eaten by other organisms, and so on. For example, grass is eaten by insects, which in turn, is taken by the frog. The frog is consumed by snakes. This is said to
form a food chain: Grass→ insects→ frog→ snake→ eagle. Many food chains can be found in the forest. All food chains are linked. If anyone food chain is disturbed, it affects other food chains. Every part of the forest is dependent on the other parts. If we remove one component, say trees, all other components would be affected.