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  1. Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, bu a lot of it does not remain in the lower atmosphere because of
    1. Its escape into the outer strato-sphere.
    2. The photosynthesis by phyto-plankton 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 only
    3. 2 and 3 only
    4. 3 only
Correct Option: C

NA



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