What are the problems caused by the non-biodegradable wastes that we generate?

2

(a)

If all the waste we generate is biodegradable, will this have no impact on the environment?

2

(a)

Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

2

(a)

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

2

(a)

Why energy of herbivores never come back to the autotrophs?

2

(a)

Aquarium requires regular cleaning whereas lakes normally do not. Why?

2

(a)

Construct an aquatic food chain showing four trophic levels.

2

(a)

Why some substances are degraded and others not?

2

(a)

Define food web.

2

(a)

Explain the different trophic level in an ecosystem by giving examples in pond and grassland.

2

(a)

Is it necessary to conserve our environment? Why?

2

(a)

Give the correct sequence of various trophic levels in a food chain

2

(a)

In the food chain given below:
Grass\(\longrightarrow\)Grasshopper\(\longrightarrow\)Frog\(\longrightarrow\)Snake\(\longrightarrow\)Peacock
What will happen if all the frogs are removed?

2

(a)