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ICSE Class 10 Biology Question 5 of 10

Pollution — A Rising Environmental Problem — Question 3

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Question 3

The following picture depicts a certain phenomenon.

The following picture depicts a certain phenomenon. Name the phenomenon and explain it. Enlist the sources that are responsible for the above mentioned phenomenon. List out the effects of the above phenomenon on humans. Pollution A Rising Environmental Problem, Concise Biology Solutions ICSE Class 10.

(i) Name the phenomenon and explain it.

(ii) Enlist the sources that are responsible for the above mentioned phenomenon.

(iii) List out the effects of the above phenomenon on humans.

Answer

(i) The phenomenon depicted in the picture is Ozone layer depletion. It is a phenomenon in which certain gaseous compounds such as chlorofluorocarbons (CFCs) break down into chlorine atoms which in turn break down ozone (O3) into oxygen (O2) and O.

(ii) The sources responsible for ozone layer depletion are gaseous compounds such as chlorofluorocarbons (CFCs) released from refrigerators, aerosol spray cans and packaging material styrofoam.

(iii) Effects of ozone layer depletion on humans are:

  1. Sun burn
  2. Genetic disorders
  3. Skin cancer