The source of CO_2 for photosynthesis during | vedclass

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(B) In $CAM$ plants,the stomata open at night to take in $CO_2$,which is fixed into malic acid and stored in vacuoles.During the day,the stomata remai

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Malic acid

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(B) In $CAM$ plants,the stomata open at night to take in $CO_2$,which is fixed into malic acid and stored in vacuoles.During the day,the stomata remain closed to prevent water loss.The stored malic acid is transported out of the vacuole and decarboxylated to release $CO_2$ and pyruvic acid.This released $CO_2$ is then utilized in the $C_3$ cycle (Calvin cycle) for photosynthesis.

The source of $CO_2$ for photosynthesis during the day in $CAM$ plants is:

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