Question:
Which is the driving force for the process of passive absorption of water in roots?
Which is the driving force for the process of passive absorption of water in roots?
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In passive absorption the root only acts as a channel and the pull comes from the leaves.
Updated On: Nov 12, 2026
- Root pressure
- Capillarity in root xylem cells.
- Transpiration pull in leaves
- More supply of oxygen
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
In passive absorption the root cells are not metabolically involved. The force for water uptake is generated in the shoot.
Step 2: Mechanism
Transpiration from leaves creates tension in the xylem. Because water molecules cohere and adhere to xylem walls, this pull is passed to the root and water moves in from the soil.
Step 3: Why the other options fail
Root pressure is linked to active absorption. Capillarity is too weak and oxygen supply affects active absorption.
Final Answer:
Transpiration pull in leaves drives passive absorption. \[ \boxed{\text{(C) }\text{Transpiration pull in leaves}} \]
In passive absorption the root cells are not metabolically involved. The force for water uptake is generated in the shoot.
Step 2: Mechanism
Transpiration from leaves creates tension in the xylem. Because water molecules cohere and adhere to xylem walls, this pull is passed to the root and water moves in from the soil.
Step 3: Why the other options fail
Root pressure is linked to active absorption. Capillarity is too weak and oxygen supply affects active absorption.
Final Answer:
Transpiration pull in leaves drives passive absorption. \[ \boxed{\text{(C) }\text{Transpiration pull in leaves}} \]
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