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What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas?
Explain how animals dwelling in the forest help it grow and regenerate.
What are decomposers? Explain with example.
Untreated human excreta are a health hazard. Justify the statement.
Explain how forests prevent floods.
What do you understand by the term "sewerage"?
List few ways to control sewage generation.
Discuss the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
What is sludge and
how is it treated?
Explain why there is a need of variety of animals and plants in a forest?
There is no waste in a forest. Explain
What is a clarifier?
Why forest floor seemed to be dark coloured?
What are the adverse effects of drinking contaminated water?
What is sewage and sewage treatment?
Explain why is it harmful to discharge untreated sewage into Water bodies?
What do you mean by
waste water?
Enlist the various
causes of water pollution.
Explain the importance of forest.
Explain the various steps involved in water treatment plant.