The Question is from neet-botany , and it was created by the author B VENKAT

Question

Which of the following contributes the most to the long-distance transport of water in tall trees?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Water transport in plants
	**Related Topics**: Transpiration, Cohesion-tension theory, Capillary action, Root pressure
	**Prerequisites**: Basic plant anatomy and physiology
## SOLUTION PATHWAY
**Given Information**:
	We need to identify the primary driver of long-distance water transport in tall trees.
**Method & Steps**:
	1. **Analyze each option**:
		Reasoning: Consider the mechanism and contribution of each process to water movement.
	2. **Identify the most significant contributor**:
		Working: Compare the effectiveness of each process in moving water over long distances.
		Key Point:  Tall trees require a strong upward force to overcome gravity and transport water to their highest points.
	3. **Select the correct option**:
		Result: Transpiration
		Verification: The cohesion-tension theory explains how transpiration creates a negative pressure gradient that pulls water upwards from the roots to the leaves.
## OPTION ANALYSIS
[A] :x: Root pressure: While root pressure can push water upwards, it's a relatively weak force and not the primary driver of long-distance transport, especially in tall trees.
[B] :x: Capillary action: Capillary action plays a role in water movement within small spaces like xylem vessels, but it's not strong enough to lift water to the tops of tall trees.
[C] ✓: Transpiration: Transpiration, the evaporation of water from leaves, creates a negative pressure (tension) that pulls water up the xylem. This 'pulling' force is the main driver of long-distance water transport in tall trees.
[D] :x: Active transport by xylem cells: Xylem cells are dead at maturity and don't perform active transport. Water movement in xylem is passive, driven by the transpiration pull.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing capillary action with the primary driver of water transport: Capillary action contributes to water movement but is insufficient for long-distance transport in tall trees.
		2. Overestimating the role of root pressure: Root pressure is a minor contributor compared to transpiration.
	**Quick Tips**:
		1. Remember the cohesion-tension theory: Transpiration is the engine that drives the upward movement of water.
		2. Visualize the process: Imagine water being pulled up a straw – transpiration creates the suction force.

B VENKAT · Answer

Root pressure

B VENKAT · Answer

Capillary action

B VENKAT · Answer

The correct Option is "Transpiration"

B VENKAT · Answer

Active transport by xylem cells

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