Question

Assertion (A): The ozone layer in the upper atmosphere is very important for the existence of life on earth because it absorbs most of the harmful ultraviolet radiations coming from the sun and prevents them from reaching the earth.

Reason (R): The ultraviolet radiations coming from the sun can cause skin cancer. They also damage the eyes by causing an eye-disease called cataract. Ultraviolet rays also damage immune system by lowering the body’s resistance to diseases.

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true and R is correct explanation of the assertion.

Explanation:

The ozone layer in the upper atmosphere absorbs most of the harmful ultraviolet (UV) radiation from the Sun and prevents it from reaching the Earth. Therefore, Assertion (A) is true.

Ultraviolet radiations can cause skin cancer, cataracts (eye damage), and weaken the immune system by lowering the body's resistance to diseases. Therefore, Reason (R) is true.

Since these harmful effects of UV radiation explain why the ozone layer is essential for the existence of life on Earth, Reason (R) is the correct explanation of Assertion (A).

Hence, both A and R are true, and R is the correct explanation of the assertion.