Same chapter3 marksDifficulty: Medium
What is the greenhouse effect? Name two greenhouse gases and state one consequence of an enhanced effect.
Atmospheric Pollution
3 marksDifficulty: Medium
What causes the depletion of the ozone layer and why does it matter?
Original Khojo Papers practice question — not from a past board paper.
Answer
Chlorofluorocarbons released from refrigerators, air conditioners and aerosols rise to the stratosphere, where ultraviolet light breaks them up and frees chlorine atoms that destroy ozone molecules. It matters because the ozone layer absorbs most of the sun's harmful ultraviolet radiation, and without it the risk of skin cancer, cataract and damage to crops rises sharply.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The Montreal Protocol phased out the use of chlorofluorocarbons.
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