Question:
Stomatal transpiration takes place during day time in the following plants EXCEPT________.
Stomatal transpiration takes place during day time in the following plants EXCEPT________.
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A CAM plant such as cactus keeps its stomata closed during the day.
Updated On: Nov 12, 2026
- Lotus
- Mango
- Grass
- Cactus
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Most plants open their stomata in light, so stomatal transpiration occurs by day in lotus, mango and grass.
Step 2: The exception
Cactus is a xerophyte with CAM photosynthesis. Its stomata are closed during the day to save water and open at night (scotoactive stomata) to take in \(\text{CO}_2\).
Step 3: Conclusion
Its stomatal transpiration takes place at night, not during the day.
Final Answer:
Cactus is the exception. \[ \boxed{\text{(D) }\text{Cactus}} \]
Most plants open their stomata in light, so stomatal transpiration occurs by day in lotus, mango and grass.
Step 2: The exception
Cactus is a xerophyte with CAM photosynthesis. Its stomata are closed during the day to save water and open at night (scotoactive stomata) to take in \(\text{CO}_2\).
Step 3: Conclusion
Its stomatal transpiration takes place at night, not during the day.
Final Answer:
Cactus is the exception. \[ \boxed{\text{(D) }\text{Cactus}} \]
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