Question

Which disease may primarily be caused in humans by ultraviolet (UV) rays of the Sun?

• A. Lung cancer
• B. Tuberculosis (T.B.)
• C. Oral cancer
• D. Skin cancer

Hint:

The ozone layer protects us from UV radiation. Depletion of ozone increases the risk of skin cancer.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The Sun emits ultraviolet (UV) radiation, which can damage living tissues when exposure is prolonged or intense.
Lung cancer: Caused mainly by smoking or air pollution.
Tuberculosis (T.B.): Caused by bacteria Mycobacterium tuberculosis, not UV rays.
Blood cancer: Caused by abnormal growth of blood cells, unrelated to UV rays.
Skin cancer: Caused by harmful UV rays damaging DNA in skin cells.
Step 2: Detailed Explanation:
The major harmful effect of UV rays is skin cancer, especially in people with prolonged sun exposure and less melanin protection.
Step 3: Final Answer:
The disease caused by UV rays is Skin cancer.