A) day time through the lenticles
B) night through the stomata which are kept open
C) day time when the stomata are open
D) night when the hydathodes are open
Correct Answer: B
Solution :
In CAM plants the stomata open at night. This allows the entry of \[C{{O}_{2}}\]in the leaves. The carbohydrate stored in plants are converted to PEP by glycolysis which is carboxylated to malic acid. Thus, \[C{{O}_{2}}\]is fused in plants as malic acid. Which stored inside vacuole. In the day time stomata close and the malate transported to chloroplast, undergoes decarboxylation and the released \[C{{O}_{2}}\] is fixed by Calvin cycle.
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