What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner?

The gas A is used by most of the animals to obtain energy from food by the process of respiration. When A is acted upon by radiation X, it gets converted into another gas B which is an allotrope of A but poisonous when inhaled. B forms a kind of layer C in the upper atmosphere which absorbs radiations X coming from a source Y and prevents them from reaching the earth. Some chemicals Z released from the various devices on the earth are destroying the layer C slowly. In fact, a hole has already been formed in layer Cover the area D of the earth.

(a) What are gases?

(i) A, and

(ii) B? Write their molecular formulae.

(b) Name the layer C.

(c) What are (i) X, (ii) Y, and (iii) Z?

(d) Name the area D.

(e) Name any two human ailments which may be caused by X.

Suggest any four activities in daily life which are eco-friendly.

What are the advantages of cloth bags over plastic bags during shopping?

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

Depletion of ozone is mainly due to

What is the function of ozone in the upper atmosphere?

What is the important function of presence of ozone in earth’s atmosphere?

Every one of us can do something to reduce our consumption of various natural resources. List four such activities based on 3-R approach.

The construction of large dams lead to social and environmental problems. List two problems of each category.