Question

Excessive exposure of humans to U V-rays results in

(i) damage to the immune system

(ii) damage to lungs

(iii) skin cancer

(iv) peptic ulcers

• A. (i) and (ii)
• B. (ii) and (iv)
• C. (i) and (iii)
• D. (iii) and (iv)

Answer 1

The correct option is C

(i) and (iii)

The correct answer is C.

Explanation of the correct option:

1. Ultraviolet is referred to as the kind of radiation emitted by the Sun and is transmitted either as waves or particles with different wavelengths and frequencies.
2. The harmful effects of UV rays affect the upper surface of our body.
3. UV rays lead to skin cancer and as skin is the protective covering of our body, it may lead to damage to the immune system.

Explanation of the incorrect options:

Option A:

1. UV radiation cannot lead to damage to the lungs. Polluted air can be responsible for damaging the lungs.
2. UV rays may cause damage to the immune system.

Option B:

1. UV radiation cannot lead to damage to the lungs.
2. Peptic ulcers are not formed due to UV radiation. But contaminated food and high acid content in the body can lead to peptic ulcers.

Option D:

1. UV rays may cause skin cancer.
2. Peptic ulcers are not formed due to UV radiation. But contaminated food and high acid content in the body can lead to peptic ulcers.

Final answer: Excessive exposure of humans to UV rays results in damage to the immune system and skin cancer.