Multiple choice

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.

Which of the statements given above is/ are correct?

  1. 1 and 2

  2. 2 and 3

  3. 2 only

  4. 3 only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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 the photosynthesis by phyto-plankton in the oceans. The trapping of air in the polar ice caps is concerned with Mars, not Earth.

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