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Explain how animals dwelling in the forest help it grow and regenerate.
What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas?
Explain why there is a need of variety of animals and plants in a forest?
Explain how forests prevent floods.
Discuss the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Why forest floor seemed to be dark coloured?
What are decomposers? Explain with example.
What is sludge and
how is it treated?
Untreated human excreta are a health hazard. Justify the statement.
Oils and fats should not release in the drain. Explain why?
There is no waste in a forest. Explain
List few ways to control sewage generation.
Explain the importance of forest.
What do you understand by the term "sewerage"?
Define the following:
· Understoreys
Explain why is it harmful to discharge untreated sewage into Water bodies?
What are the adverse effects of drinking contaminated water?
Enlist the various
causes of water pollution.
What is a clarifier?
What is sewage and sewage treatment?