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Topics
Introduction
Constituents of forests
Food chain
Humus and decomposers
Characteristics of forest
Importance of forest
Introduction
Air pollution and its control
Noise pollution
Water pollution and its control
Solid wastes
Agro-chemicals and their effects
Greenhouse effect and global warming
Ozone depletion in the stratosphere
Degradation by improper resource utilization and maintenance
Deforestation
Class 7 Biology Forests: Our Lifeline
Importance of forest
Importance of forest
We receive oxygen from forests.
Forests protect the soil.
Forests provide habitat to a large number of animals.
The neighboring areas get good rainfall due to forests.
We get medicinal plants and timber from forests.
Fig. Timber
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