Question

Which one among the following is NOT a reason for increase in concentration of carbon dioxide in the atmosphere?

• A. Burning of fossil fuel
• B. Rapid deforestation
• C. Weathering of rocks
• D. Respiration by plants and animals

Hint:

Chemical weathering of rocks uses up carbon dioxide, so it does not raise its level.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
The level of \(\text{CO}_2\) rises when sources increase or when sinks are lost.

Step 2: Check the options
Burning fossil fuels releases carbon stored for millions of years as \(\text{CO}_2\). Deforestation removes plants that absorb \(\text{CO}_2\) and adds more by burning and decay. Respiration of plants and animals releases \(\text{CO}_2\).

Step 3: Weathering
Chemical weathering of rocks uses up atmospheric \(\text{CO}_2\) and forms dissolved bicarbonate, so it lowers the concentration.

Final Answer:
Weathering of rocks is not a reason for the rise in carbon dioxide. \[ \boxed{\text{(C) }\text{Weathering of rocks}} \]