Question:
Stomata open at night in
Stomata open at night in
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CAM plants show scotoactive stomata (open at night to conserve water, closed during day).
Updated On: Sep 15, 2026
- C3 plants
- CAM plants
- C4 plants
- C2 plants
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Xerophytic and succulent plants adapt stomatal movements to minimize evapotranspirational water loss in arid environments.
Step 2: Detailed Explanation:
Crassulacean Acid Metabolism (CAM) plants (e.g., pineapple, Opuntia, Kalanchoe, agave) exhibit scotoactive stomatal behavior.
Their stomata open during the cool night to fix atmospheric $\text{CO}_2$ into malic acid via PEP carboxylase, storing it in vacuoles, and close during the hot day to perform photosynthetic de-acidification and Calvin cycle behind closed stomata.
Step 3: Final Answer:
Thus, stomata open at night in CAM plants.
Xerophytic and succulent plants adapt stomatal movements to minimize evapotranspirational water loss in arid environments.
Step 2: Detailed Explanation:
Crassulacean Acid Metabolism (CAM) plants (e.g., pineapple, Opuntia, Kalanchoe, agave) exhibit scotoactive stomatal behavior.
Their stomata open during the cool night to fix atmospheric $\text{CO}_2$ into malic acid via PEP carboxylase, storing it in vacuoles, and close during the hot day to perform photosynthetic de-acidification and Calvin cycle behind closed stomata.
Step 3: Final Answer:
Thus, stomata open at night in CAM plants.
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