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

Question

A plant with a mutation that disables aquaporins in its root cells would likely exhibit:

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant water transport
 **Related Topics**: Aquaporins, apoplast pathway, symplast pathway, transpiration
 **Prerequisites**: Understanding of water movement in plants, roles of aquaporins
## SOLUTION PATHWAY
**Given Information**:
  A plant with a mutation disabling aquaporins in root cells.
  Aquaporins are channel proteins that facilitate water movement across cell membranes.
**Method & Steps**:
 1. Consider the role of aquaporins in water uptake.
  Reasoning: Aquaporins significantly increase the rate of water movement across cell membranes.  Disabling them reduces, but doesn't eliminate, water uptake.
  Formula/Rule:  No specific formula, but understanding of facilitated diffusion is crucial.
 2. Consider alternative pathways for water movement.
  Working: Even without aquaporins, water can still move via the apoplast (cell wall) pathway and the symplast (plasmodesmata) pathway, albeit at a slower rate.
  Key Point: The apoplast pathway is less regulated than the aquaporin-mediated pathway and may become more significant when aquaporins are non-functional.
 3. Determine the effect of aquaporin disablement.
  Result: The rate of water uptake will be reduced, but not completely stopped because alternative pathways exist.
  Verification: The question states a *mutation*, implying a partial, not complete, loss of function. Complete cessation of water uptake would be lethal.
 ## OPTION ANALYSIS
A :x: Complete cessation of water uptake is incorrect because alternative pathways for water transport exist (apoplast and symplast pathways).
B :x: Enhanced water uptake is incorrect; disabling aquaporins would hinder, not enhance, water uptake.
 C ✓: Reduced rate of water uptake but not complete cessation is correct because alternative pathways exist, though they are less efficient.
D :x: Aquaporins are involved in both water uptake and transpiration, but their role in root water uptake is directly relevant to this question.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Assuming complete cessation of water uptake:  Forgetting about alternative pathways for water transport.
  2.Overemphasizing aquaporins' role in transpiration: While important in transpiration, aquaporins also play a significant role in root water uptake.
 **Quick Tips**:
  1.Remember the three pathways of water movement in plants: apoplast, symplast, and transmembrane (via aquaporins).
  2.Visualize water movement through the root and how aquaporins facilitate this process.

B VENKAT · Answer

Complete cessation of water uptake.

B VENKAT · Answer

Enhanced water uptake due to increased reliance on the apoplast pathway.

B VENKAT · Answer

The correct Option is "Reduced rate of water uptake but not complete cessation."

B VENKAT · Answer

No change in water uptake as aquaporins are primarily involved in transpiration.

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