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

Question

The main driving force for the ascent of sap in tall trees is:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Transpiration pull in plants
 **Related Topics**:  Xylem, cohesion-tension theory, water potential, osmosis
 **Prerequisites**: Basic understanding of plant anatomy and water transport mechanisms.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the primary force responsible for sap ascent in tall trees.
**Method & Steps**:
 1. Analyze the options:
  Reasoning: We need to identify the dominant force that overcomes gravity to lift water to the top of tall trees.
 2. Evaluate each option:
  Root pressure contributes minimally, especially in tall trees. Capillary action alone is insufficient for the heights involved. Active transport by xylem cells plays a minor role in water movement. Transpiration pull, driven by water evaporation from leaves, creates a negative pressure (tension) that pulls water upwards through the xylem. This is the main driving force.
 3. Conclude:
  Result: Transpiration pull is the primary force.
  Verification: The cohesion-tension theory, supported by extensive experimental evidence, explains the role of transpiration pull in sap ascent.
 ## OPTION ANALYSIS
A :x: Root pressure provides only a small initial push and is insufficient for tall trees.
B :x: Capillary action is too weak to lift water to the great heights of tall trees.
C ✓: Transpiration pull, the force generated by water evaporation from leaves, is the primary driving force for sap ascent in tall trees.
D :x: While active transport plays a role in moving solutes, it is not the main driving force for water transport in the xylem.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing root pressure with transpiration pull: Root pressure contributes minimally compared to transpiration pull.
  2.Underestimating the importance of cohesion and adhesion: These properties of water are crucial in maintaining the continuous water column in the xylem.
 **Quick Tips**:
  1.Remember the cohesion-tension theory: Cohesion between water molecules and adhesion between water and xylem walls are essential for transpiration pull.
  2.Visualize the process: Imagine water evaporating from leaves, creating a pull that draws water up from the roots.

Mr. NARESH KUMAR K · Answer

Root pressure

Mr. NARESH KUMAR K · Answer

Capillary action

Mr. NARESH KUMAR K · Answer

The correct Option is "Transpiration pull"

Mr. NARESH KUMAR K · Answer

Active transport by xylem cells

NEET Botany Transport in Plants Translocation Of Mineral Ion MCQs

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