Question

Give scientific reasons for the following statements :
(i) Use of C.F.C is banned in many countries.
(ii) We cannot distinguish colours in moonlight.
(iii) Balsam plants wilt during midday even if the soil is well watered.
(iv) Carbon monoxide is highly dangerous when inhaled.
(v) A person after consuming alcohol walks clumsily.

Answer 1

(i) Chlorofluorocarbons (CFC) are one of the major cause for ozone depletion. These are compounds which are used as coolants. They destroy the ozone molecules and cause depletion.

(ii) Moonlight is dimlight. The colours in the moonlight does not allows the cone cells of our eye to function well. So, the colour is not perceived and analysed. It is only rod cells that function in moonlight.

(iii) It is a herbaceous plant and loses too much of water by excessive transpiration. The rate of transpiration is more than the rate of absorption. So they with weak stem droops and wilts.

(iv) Carbon monoxide has great affinity with haemoglobin of our blood. It mixes with haemoglobin almost 300 times more than that with oxygen. It cuts off the supply of oxygen due to which it is fatal.

(v) Alcohol affects the cerebellum part of the brain which is responsible for muscular co-ordination. So after consuming alcohol due to lack of muscular balance and co-ordination, the person walks clumsily.