The Question is from neet-botany plant-physiology transpiration, and it was created by the author Mr. NARESH KUMAR K

Question

The cohesion-tension theory explains the upward movement of water in plants. Which of the following is NOT a critical component of this theory?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Cohesion-tension theory of water transport in plants
 **Related Topics**: Transpiration, xylem, water potential, osmosis
 **Prerequisites**: Basic understanding of water properties (cohesion, adhesion), plant anatomy (xylem), and the process of transpiration.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the component NOT crucial to the cohesion-tension theory.
**Method & Steps**:
1. Understand the cohesion-tension theory: This theory explains how water moves upwards in plants against gravity. It relies on the cohesive forces between water molecules (they stick together), the adhesive forces between water and xylem walls (water sticks to the xylem), and the transpiration pull (water loss from leaves creates a negative pressure that pulls water upwards).
2. Analyze each option:
    * **A. Cohesion of water molecules:** This is essential; cohesion creates a continuous water column in the xylem.
    * **B. Adhesion of water molecules to xylem walls:** This is crucial; adhesion helps water molecules cling to the xylem walls, preventing the water column from breaking.
    * **C. Transpiration pull creating negative pressure:** This is vital; transpiration creates the driving force for water movement.
    * **D. Active transport of water into xylem by root cells:** While root cells do play a role in water uptake, the primary mechanism of water transport *upwards* in the xylem is explained by cohesion, adhesion, and transpiration pull.  Active transport is more significant in the initial uptake of water into the roots.
3. Identify the non-critical component: Option D, active transport of water into the xylem by root cells, is not a critical component of the *upward* movement of water explained by the cohesion-tension theory. While it contributes to water uptake, the upward movement is primarily driven by the other three factors.
  Result: D
  Verification: The cohesion-tension theory focuses on the physical properties of water and the transpiration pull. Active transport is a separate process primarily involved in initial water uptake.
 ## OPTION ANALYSIS
A ✓: Cohesion is a fundamental property of water crucial for the cohesion-tension theory.
B ✓: Adhesion ensures the water column stays attached to the xylem walls.
C ✓: Transpiration pull generates the negative pressure needed to draw water upwards.
D :x: Active transport is important for water uptake by roots but is not a central component of the cohesion-tension theory for upward water movement.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing active transport with passive transport:  While both are involved in water movement in plants, they have different mechanisms and roles in the overall process.
  2.Overlooking the importance of transpiration: Students might underestimate the role of transpiration in creating the negative pressure gradient driving water upward.
 **Quick Tips**:
  1.Remember the three key forces: cohesion, adhesion, and transpiration pull.
  2.Visualize the water column in the xylem and how these forces work together.

Mr. NARESH KUMAR K · Answer

Cohesion of water molecules

Mr. NARESH KUMAR K · Answer

Adhesion of water molecules to xylem walls

Mr. NARESH KUMAR K · Answer

Transpiration pull creating negative pressure

Mr. NARESH KUMAR K · Answer

The correct Option is "Active transport of water into xylem by root cells"

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