During day time the green plants show a ratio of $C O_{2}$ consumption to $C O_{2}$ production of

1 : 1

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5 : 1

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10 : 1

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20 : 1.

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Solution

The correct option is B 10 : 1
During the daytime, in the period of intense sunlight, the stomata are closed because the plant will lose excess of water due to transpiration.
Therefore photosynthesis takes place during the daytime and respiration is reduced.
The amount of CO₂ consumed is more in the daytime as it is the raw material for photosynthesis.
So, the correct option is '10:1'

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During day time the green plants show a ratio of CO2 consumption to CO2 production of

During day time the green plants show a ratio of $C O_{2}$ consumption to $C O_{2}$ production of