The Question is from neet-botany plant-physiology how-do-plants-absorb-water, and it was created by the author D VINOD

Question

The main driving force for the absorption of water in plants is:

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Water transport in plants
 **Related Topics**: Transpiration, root pressure, capillary action, osmosis
 **Prerequisites**: Understanding of water potential, cohesion-tension theory
## SOLUTION PATHWAY
**Given Information**:
The question asks about the main driving force for water absorption in plants.
**Method & Steps**:
1. Analyze the options:
  Reasoning: We need to identify the dominant mechanism responsible for water uptake from roots to leaves.
  Formula/Rule: None directly applicable, but understanding of the processes is crucial.
 2. Evaluate each option:
  Working: 
        * **Root pressure:** This contributes to some water movement, but it's relatively weak and insufficient to lift water to the tops of tall trees.
        * **Capillary action:** This plays a minor role, particularly in smaller vessels, but it's not the primary force.
        * **Transpiration pull:** This is the major driving force.  Transpiration (water loss from leaves) creates a negative pressure (tension) in the xylem, pulling water upwards from the roots. This is explained by the cohesion-tension theory.
        * **Photosynthesis:** Photosynthesis uses water, but it doesn't directly drive water absorption.
 3. Conclusion:
  Result: Transpiration pull (option C) is the main driving force for water absorption in plants.
  Verification: The cohesion-tension theory strongly supports this conclusion. The continuous column of water in the xylem is maintained by the cohesive forces between water molecules and the adhesive forces between water and xylem walls. The transpiration pull creates the tension necessary for this upward movement.
## OPTION ANALYSIS
A :x: Root pressure is a minor contributor, not the primary force.
B :x: Capillary action is a minor contributor, insufficient for tall plants.
C ✓: Transpiration pull is the main driving force, supported by the cohesion-tension theory.
D :x: Photosynthesis uses water but doesn't directly cause its absorption.
## LEARNING AIDS
 **Common Mistakes**:
  1. Confusing root pressure with transpiration pull: Root pressure contributes minimally, while transpiration pull is the dominant force.
  How to avoid: Understand the relative strengths of these mechanisms and the cohesion-tension theory.
  2. Overlooking the role of cohesion and adhesion: These forces are crucial for maintaining the continuous water column in the xylem.
  How to avoid: Learn the cohesion-tension theory and its components.
 **Quick Tips**:
  1. Remember the cohesion-tension theory as the primary explanation for water transport in plants.
  2.  Think of transpiration as the 'pull' that initiates the process.

D VINOD · Answer

Root pressure

D VINOD · Answer

Capillary action

D VINOD · Answer

The correct Option is "Transpiration pull"

D VINOD · Answer

Photosynthesis

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