Question:
In plants, active absorption usually does NOT occur when __________
In plants, active absorption usually does NOT occur when __________
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Active absorption needs metabolic energy and is important when transpiration is low.
Updated On: Nov 13, 2026
- stomata are open
- stomata are closed
- transpiration stops
- it is night time
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Absorption of water in plants is passive (due to transpiration pull) or active (using metabolic energy of root cells).
Step 2: Passive versus active
When stomata are open, transpiration is rapid and a strong pull draws water in, so passive absorption dominates. Active absorption is significant when transpiration is slow, such as with closed stomata, at night or when transpiration stops.
Step 3: Compare the options
Active absorption does NOT usually occur when the stomata are open.
Final Answer:
Active absorption usually does not occur when stomata are open. \[ \boxed{\text{(A) }\text{stomata are open}} \]
Absorption of water in plants is passive (due to transpiration pull) or active (using metabolic energy of root cells).
Step 2: Passive versus active
When stomata are open, transpiration is rapid and a strong pull draws water in, so passive absorption dominates. Active absorption is significant when transpiration is slow, such as with closed stomata, at night or when transpiration stops.
Step 3: Compare the options
Active absorption does NOT usually occur when the stomata are open.
Final Answer:
Active absorption usually does not occur when stomata are open. \[ \boxed{\text{(A) }\text{stomata are open}} \]
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