Question

Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of _______.
1. its escape into the outer stratosphere.
2. the photosynthesis by phytoplankton in the oceans.
3. the trapping of air in the polar ice caps.
Select the correct answer using the codes given below.

• A. 1 and 2
• B. Only 2
• C. 2 and 3
• D. Only 3

Answer 1

The correct option is B Only 2

Phytoplankton are a very important part of the ocean foodchain. They make their own food by photosynthesis for which they utilize atmospheric carbon dioxide.

Trapping of carbon dioxide on polar ice caps is not known. Also, carbon dioxide does not escape into the stratosphere.