If photosynthesis does not take place in a plant during the day time, then the plant releases

Oxygen.

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Carbon dioxide.

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Water vapour.

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None of the above.

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Solution

The correct option is C Carbon dioxide.
In photosynthesis, an enzyme called RuBP carboxylase absorbs $C O_{2}$ in the first steps of photosynthesis. This works because there is plenty of carbon dioxide than oxygen. If there is too much oxygen, RuBP carboxylase will absorb oxygen instead of the $C O_{2}$ and photorespiration will occur. Photorespiration does not help build up any sugars, so if photorespiration occurs, growth stops. Normally, oxygen (produced in photosynthesis) is passed through the stomata; however, if there isn't enough water available (as would happen under bright, hot, sunny conditions), excess oxygen may build up and trigger photorespiration and $C O_{2}$ will be released out through the stomata.

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