Q. In CAM-plants, carbon dioxide required for photosynthesis enters the plant body during
A) Day time through the lenticels
B) Night through the stomata, which are kept open
C) Day time when the stomata are open
D) Night when the hydathodes are open
Explanation
In CAM-plants, the stomata open at night. This allows the entry of carbon dioxide in the leaves. The carbohydrates stored in plants are converted to PEP by Glycolysis, which is carboxylated to malic acid. Thus, carbon dioxide 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 carbon dioxide is fixed by Calvin cycle.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.