Question:
According to capillarity theory __________ alone causes ascent of sap in plants.
According to capillarity theory __________ alone causes ascent of sap in plants.
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The capillarity theory depends on physical forces acting in non-living xylem tubes.
Updated On: Nov 13, 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
Several theories explain the ascent of sap, such as root pressure, capillarity theory and cohesion-tension theory.
Step 2: Capillarity theory
According to this theory water rises in the narrow xylem vessels by capillary action, using the physical forces of adhesion and surface tension. Xylem vessels and tracheids are dead cells and no living activity is needed.
Step 3: Compare the options
Hydrostatic pressure, osmotic pressure and transpiration pull belong to other theories. The option mentioning physical forces and dead cells fits.
Final Answer:
The capillarity theory attributes ascent of sap to physical forces and dead cells. \[ \boxed{\text{(D) }\text{physical forces and dead cells}} \]
Several theories explain the ascent of sap, such as root pressure, capillarity theory and cohesion-tension theory.
Step 2: Capillarity theory
According to this theory water rises in the narrow xylem vessels by capillary action, using the physical forces of adhesion and surface tension. Xylem vessels and tracheids are dead cells and no living activity is needed.
Step 3: Compare the options
Hydrostatic pressure, osmotic pressure and transpiration pull belong to other theories. The option mentioning physical forces and dead cells fits.
Final Answer:
The capillarity theory attributes ascent of sap to physical forces and dead cells. \[ \boxed{\text{(D) }\text{physical forces and dead cells}} \]
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