Forests Our Lifeline

Explain why there is a need of variety of animals and plants in a forest?

Explain how animals dwelling in the forest help it grow and regenerate.

Why forest floor seemed to be dark coloured?

What are decomposers? Explain with example.

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas?

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 how forests prevent floods.

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

List few ways to control sewage generation.

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

What do you understand by the term "sewerage"?

There is no waste in a forest. Explain

Explain the importance of forest.

Enlist the various

causes of water pollution.

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

What are the adverse effects of drinking contaminated water?

Define the following:

• Crown

· Understoreys

What is a clarifier?

What is sewage and sewage treatment?