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Exercises on Forests Our Lifeline. Multiple Choice Questions (MCQs) 1. Removal of top fertile soil by wind or water is called (a) leaching (b) weathering of soil (c) soil erosion (d) siltation 2. Microorganisms act upon the dead plants and animals to produce (a) sand (b) clay (c) humus (d) wood 3. The topmost layer of the forest is (a) forest.
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Question: Explain how forests prevent floods. Answer: Forest absorbs rainwater and allows it to seep naturally; its leaves and branches prevent rain to hit the ground directly. Question: What are decomposers? Explain with example. Answer: The micro-organisms which convert the dead plants and animals to humus are known as decomposers like Fungi and bacteria.
NCERT 7th Class (CBSE) Science: Forests: Our Lifeline admin November 10, 2017 7th Class, Science Leave a comment 4,208 Views Question: Write a short note on the cycle of nutrients.
Summers are warm and winters are cold, but not as cold as the northern coniferous forests. In the winter, snow covers the ground and the deciduous trees and plants lose their leaves. The decaying leaves help make the soil rich in nutrients. Many insects, spiders, snails, and worms make their homes in this rich soil.
A forest is usually an area filled with trees but any tall densely packed area of vegetation may be considered a forest, even underwater vegetation such askelp forests, or non-vegetation such asfungi, (2) andbacteria. Tree forests cover approximately 9.4 percent of theEarth's surface (or 30 percent of total land area), though they once covered much more (about 50 percent of total land area).