Forests Our Lifeline

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

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

Why forest floor seemed to be dark coloured?

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

What are decomposers? Explain with example.

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.

List few ways to control sewage generation.

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

There is no waste in a forest. Explain

Explain the importance of forest.

What do you understand by the term "sewerage"?

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

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

Enlist the various

causes of water pollution.

What are the adverse effects of drinking contaminated water?

What is a clarifier?

Define the following:

• Crown

· Understoreys

What is sewage and sewage treatment?