Question:
According to capillarity theory, ______ alone causes the ascent of sap in plants.
According to capillarity theory, ______ alone causes the ascent of sap in plants.
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Capillarity theory is a physical force theory and needs no living cells.
Updated On: Nov 12, 2026
- hydrostatic pressure
- osmotic pressure
- transpiration pull
- physical forces and dead cells
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Theories of ascent of sap are grouped as vital force theories, root pressure theory and physical force theories.
Step 2: Capillarity theory
Capillarity theory (Boehm) is a physical force theory. Xylem vessels and tracheids are narrow, dead tubes in which water rises by capillary action.
Step 3: Result
In this view only physical forces working in dead conducting cells lift the sap. Root pressure, osmotic pressure and transpiration pull belong to other theories.
Final Answer:
According to capillarity theory, sap rises only due to physical forces and dead cells. \[ \boxed{\text{(D) }\text{physical forces and dead cells}} \]
Theories of ascent of sap are grouped as vital force theories, root pressure theory and physical force theories.
Step 2: Capillarity theory
Capillarity theory (Boehm) is a physical force theory. Xylem vessels and tracheids are narrow, dead tubes in which water rises by capillary action.
Step 3: Result
In this view only physical forces working in dead conducting cells lift the sap. Root pressure, osmotic pressure and transpiration pull belong to other theories.
Final Answer:
According to capillarity theory, sap rises only due to physical forces and dead cells. \[ \boxed{\text{(D) }\text{physical forces and dead cells}} \]
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