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

Question

A plant is exposed to high light intensity and limited water availability. Which of the following is the most likely physiological response?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant responses to environmental stress (specifically water stress)
 **Related Topics**: Stomatal regulation, photosynthesis, transpiration, water potential
 **Prerequisites**: Understanding of stomata function, the process of photosynthesis and transpiration, and the relationship between them.
## SOLUTION PATHWAY
**Given Information**:
  High light intensity (implies high photosynthetic potential)
  Limited water availability (implies risk of water loss through transpiration)
**Method & Steps**:
 1. Analyze the impact of high light intensity:
  Reasoning: High light intensity increases the rate of photosynthesis, requiring more $CO_2$ uptake.
  Formula/Rule:  Photosynthesis rate is affected by light intensity, $CO_2$ concentration, and temperature (among other factors).
 2. Analyze the impact of limited water availability:
  Reasoning: Limited water availability necessitates reducing water loss through transpiration to prevent wilting and desiccation.
  Key Point: Transpiration occurs primarily through open stomata.
 3. Consider the trade-off between CO2 uptake and water loss:
  Reasoning: The plant needs to balance the need for $CO_2$ for photosynthesis with the need to conserve water.
  Working: Complete stomatal closure would halt photosynthesis entirely.  Increased stomatal opening would exacerbate water loss.  No change in aperture wouldn't address the water limitation. Partial closure represents a compromise.
 4. Determine the most likely response:
  Result: Partial closure of stomata is the most likely response, as it reduces transpiration while still allowing some $CO_2$ uptake, albeit at a reduced rate.
  Verification: This response aligns with the plant's need to survive under water stress. Complete closure is a last resort used under extreme conditions.
 ## OPTION ANALYSIS
A :x: Increased stomatal opening would increase water loss, worsening the situation.
B :x:  Maintaining the same aperture doesn't address the water limitation.
C :x: Complete closure would halt photosynthesis entirely, which is not ideal unless the plant is facing extreme desiccation.
D ✓: Partial closure represents a compromise between minimizing water loss and maintaining some level of photosynthesis. This is the most adaptive response under the given conditions.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Ignoring the trade-off between photosynthesis and transpiration: Students might focus solely on maximizing photosynthesis without considering water loss.
  How to avoid: Clearly identify the limiting factor (water) and understand how stomatal regulation affects both processes.
  2.Assuming complete stomatal closure is always the best response: This is only true under extreme water stress conditions.
  How to avoid: Consider the level of water stress and the plant's need to continue some level of photosynthesis.
 **Quick Tips**:
  1.Remember that stomata are the primary regulators of water loss and $CO_2$ uptake in plants.
  2.Think of the plant's survival strategy under stress:  It needs to balance its needs for $CO_2$ and water.

D VINOD · Answer

Increased stomatal opening to maximize CO2 uptake for photosynthesis.

D VINOD · Answer

No change in stomatal aperture, maintaining a balance between transpiration and photosynthesis.

D VINOD · Answer

Complete closure of stomata to prevent water loss, halting photosynthesis.

D VINOD · Answer

The correct Option is "Partial closure of stomata to reduce transpiration, even at the cost of reduced CO2 uptake for photosynthesis."

NEET Botany Transport in Plants Transpiration And Photosynthesis Compromise MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company