PDE Q18

Statements 1 and 3 are correct.

Correct Statements:

• Statement 1: Ozone is found mostly in the Stratosphere
   True. About 90% of the Earth's ozone resides in the stratosphere, forming the ozone layer, typically between 15 to 35 km above the Earth’s surface.

• Statement 3: Ozone absorbs ultraviolet radiation from the Sun
   True. The ozone layer absorbs harmful UV-B and UV-C radiation, protecting life on Earth from its damaging effects (like skin cancer and eye problems).

Incorrect Statements:

• Statement 2: Ozone layer lies 55–75 km above the surface of the earth
  Statement 4: Ozone layer has no significance for life on the earth

• Option A (1 and 3) 
   Both statements are correct — this is the correct answer.