A) W
B) X
C) Y
D) Z
Correct Answer: C
Solution :
Plants give out\[C{{O}_{2}}\]and take in\[{{O}_{2}}\]during respiration whereas they give out\[{{O}_{2}}\]and take in \[C{{O}_{2}}\]during photosynthesis. At daytime photosynthesis exceeds respiration hence\[{{O}_{2}}\]is released but at night photosynthesis stops and \[C{{O}_{2}}\]is released from plants. That is why level of oxygen will decline during night. In the given graphs, 'Y' shows concentration of \[{{O}_{2}}\]in the air at night.
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