Forests Our Lifeline

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?

Discuss the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.

Explain how forests prevent floods.

What are decomposers? Explain with example.

Untreated human excreta are a health hazard. Justify the statement.

What is sludge and

how is it treated?

There is no waste in a forest. Explain

Why forest floor seemed to be dark coloured?

Oils and fats should not release in the drain. Explain why?

List few ways to control sewage generation.

Explain the importance of forest.

What do you understand by the term "sewerage"?

Define the following:

• Crown

· Understoreys

Explain why is it harmful to discharge untreated sewage into Water bodies?

What are the adverse effects of drinking contaminated water?

What is a clarifier?

Enlist the various

causes of water pollution.

What do you mean by

waste water?