Question

Which one of the following protects the life from ultraviolet rays?

• A. Ionosphere
• B. Ozonosphere
• C. Thermosphere
• D. Troposphere

Answer 1

The correct option is B

Ozonosphere

Explanation for correct option:

Option B

Ozonosphere:

• The ozone layer absorbs the harmful ultraviolet rays of the sun and prevents them from reaching the earth's surface.
• Due to a decrease in the concentration of ozone in the air, the harmful ultraviolet rays enter the earth's lower atmosphere to cause skin cancer, cataracts in the eyes, sunburn, etc.

Therefore, option B is correct.

Explanation for incorrect option:

Option A

Ionosphere:

• The mesosphere and thermosphere are together called the ionosphere.
• Auroras occur here.

Therefore, option A is incorrect.

Option C

Thermosphere:

• This layer extends from up to 500 Km to 1000 Km, as there is no fixed boundary for this layer.
• Man-made satellites orbit in this region.

Therefore, option C is incorrect.

Option D

Troposphere:

• It is the lowermost layer of the atmosphere.
• It is also the densest layer.
• In this layer, all the weather changes occur.
• All the water vapor in the air and clouds formation takes place in this layer.
• It extends up to 10 - 16 Km from sea level.

Therefore, option D is incorrect.