The Question is from neet-botany plant-physiology imbibition, and it was created by the author D VINOD

Question

The pressure that develops in the xylem during imbibition of water by seeds is primarily responsible for which of the following?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Imbibition and Seed Germination
 **Related Topics**: Water potential, xylem function, seed structure
 **Prerequisites**: Understanding of water movement in plants, seed germination process.
## SOLUTION PATHWAY
**Given Information**:
  The question focuses on the pressure generated in the xylem during imbibition (the absorption of water by a substance, causing it to swell).
  Imbibition is a crucial initial step in seed germination.
**Method & Steps**:
 1. Understanding Imbibition:
  Reasoning: Imbibition leads to the swelling of the seed, increasing its volume and exerting pressure on the surrounding structures, including the seed coat (testa).
  Formula/Rule: No specific formula is applicable here; it's a qualitative understanding of physical processes.
 2. Pressure Development:
  Working: The water absorbed during imbibition enters the xylem, creating pressure within the xylem vessels. This pressure is known as imbibition pressure or seed pressure.
  Key Point: This pressure is not the same as root pressure (which is generated by active transport in roots) or transpiration pull (which is a negative pressure drawing water upwards).
 3. Effect of Pressure:
  Result: The pressure generated in the xylem during imbibition is primarily responsible for breaking open the hard testa (seed coat), allowing the radicle (embryonic root) to emerge and begin the germination process.
  Verification:  This is a well-established fact in plant physiology. The imbibition pressure is a significant force in seed germination.
 ## OPTION ANALYSIS
A :x: Transpiration pull is a force that draws water upwards in the xylem, but it's not the primary force responsible for breaking the testa during imbibition.
B :x: Root pressure is generated by active transport in the roots and contributes to water movement, but it's not the main cause of testa rupture during imbibition.
C ✓: Breaking open the testa is the direct result of the pressure generated in the xylem during imbibition.
D :x: Guttation is the exudation of water droplets from leaves, a process unrelated to the initial pressure generated during seed imbibition.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing imbibition pressure with root pressure or transpiration pull: Focus on the initial stages of seed germination.
  2.Overlooking the physical force exerted by imbibition: Understand the swelling of the seed and its effect on the testa.
 **Quick Tips**:
  1.Remember that imbibition is the initial step leading to seed germination, and the pressure generated directly contributes to testa rupture.
  2.Visualize the seed swelling and the force required to break the hard testa.

D VINOD · Answer

Transpiration pull

D VINOD · Answer

Root pressure

D VINOD · Answer

The correct Option is "Breaking open the testa"

D VINOD · Answer

Guttation

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