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?

Why forest floor seemed to be dark coloured?

What are decomposers? Explain with example.

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

What is sludge and

how is it treated?

Explain how forests prevent floods.

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

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

Explain the importance of forest.

Define the following:

• Crown

· Understoreys

There is no waste in a forest. Explain

List few ways to control sewage generation.

What do you understand by the term "sewerage"?

What are the adverse effects of drinking contaminated water?

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

Enlist the various

causes of water pollution.

What is a clarifier?

What is sewage and sewage treatment?