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Q.

Excessive exposure of humans to UV-rays results in


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a

Damage to immune system

b

Damage to lungs

c

Skin cancer

d

Peptic ulcers 

answer is A.

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Detailed Solution

Concept: If we expose to UV rays more than limit then it causes damage to the DNA in skin cells and it leads to skin cancer. It can be affected by damaging the immune system and causing skin cancer.
The excess exposure to UV rays can result in the premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. The UV rays can also result in problems related to the eye. They can result in the cornea on the front of the eye becoming inflamed or burned.
Hece the correct options are 1 and 3.
 
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Excessive exposure of humans to UV-rays results in