Q. 615.0( 1 Vote )

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.

Class 10th Lakhmir Singh & Manjit Kaur- Biology 5. Our Environment

Answer :

a) i) The gas A used by animals to obtain energy from food by respiration is Oxygen O₂.

ii) The gas B is Ozone O₃. Radiations X (ultraviolet) when act on oxygen, convert oxygen to ozone.

b) The layer C is Ozone layer. Gas B i.e. Ozone forms ozone layer in the stratosphere.

c) i) X- Ultraviolet radiations

ii) Y- Sun. Ultraviolet radiations come from the sun

iii) Z- Chlorofluorocarbons. CFC’s are released from refrigerator and air-conditions which are destroying the ozone layer.

d) Ozone hole has been formed over Antarctica’s upper atmosphere.

e) The radiations X i.e. ultraviolet radiations cause skin cancer, when they fall on skin; they destroy the genetic material of the cells, thus resulting in uncontrolled growth of cells. These radiations are also absorbed by the lens of the eyes which leads to formation of free radicals inside the lens that causes cataract over time. Ultraviolet radiations also cause immunosuppression.

Rate this question :

How useful is this solution?

We strive to provide quality solutions. Please rate us to serve you better.

PREVIOUSWhich of the following cannot be added in a composting pit to prepare compost?NEXTThe surface of water in a lake appears green due to a layer of tiny free-floating organisms X on its surface. The lake water also contains organisms like water beetle, fish and tadpole. The sun shines over the lake water and provides energy for the functioning of this lake ecosystem.(a) What could organisms X be?(b) Write a food chain comprising of all the four organisms mentioned.(c) What is the general name of the food chains like the one written above?(d) Name(i) Secondary consumer(ii) Producer(iii) Tertiary consumer, and(iv) Primary consumer in the above food chain(e) If the tertiary consumer gets 0.2 J of energy from the secondary consumer, then how much energy was radiated by the sun to the producer?

RELATED QUESTIONS :

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.

(d) Name the area D.

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

Lakhmir Singh & Manjit Kaur- Biology

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

NCERT - Science Exemplar

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

NCERT - Science Exemplar

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

NCERT - Science Exemplar

Depletion of ozone is mainly due to

NCERT - Science Exemplar

What is the function of ozone in the upper atmosphere?

Science - Board Papers

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

Science - Board Papers

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

Science - Board Papers

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

Science - Board Papers