Question

Which is not an harmful effect of ozone depletion

• A. Cataract
• B. Skin cancer
• C. Decreased immunity
• D. Respiratory trouble

Answer 1

The correct option is D

Respiratory trouble

Concept used: Ozone layer depletion

Prerequisite: Global warming

Solution:

Explanation for correct answer:

• Ozone depletion: It is the thinning of the earth's atmosphere due to the use of ozone-depleting agents (ODS) such as Chlorofluorocarbons (CFCs) and other halons. These chemicals are used in refrigerators, fire extinguishers, etc. when it is released from the atmosphere, chlorofluorocarbons slowly deplete the ozone layer.
• It do not cause respiratory or breathing trouble.
• Breathing trouble is the difficulty in breathing due to stress or other diseases. Example: Allergy, Asthma etc

Explanation for incorrect answers:

• Ozone depletion can cause skin cancer, sunburn and decrease immunity
• Skin cancer: UV is an environmental human carcinogen that is responsible for skin cancer.
• Sunburns: UV burns the skin. Sunburn is a burn that occurs when skin cells are damaged. This damage to the skin is caused by the absorption of energy from UV rays.
• Decrease immunity: Over-exposure to UV radiation has a harmful suppressing effect on the immune system.

UV rays may affect human body at the molecular level, not at the morphological level.

So the options (a) ,(b ) and (c ) are incorrect.

Final Answer: The correct option is D.