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

Question

Imagine a mutant plant with stomata that are less sensitive to abscisic acid (ABA).  Under drought conditions, compared to a wild-type plant, this mutant would MOST likely exhibit:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: 2
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant response to drought stress and the role of abscisic acid (ABA) in stomatal regulation.
 **Related Topics**: Stomatal conductance, transpiration, photosynthesis, water potential.
 **Prerequisites**: Understanding of plant physiology, particularly the role of ABA in stress response and the relationship between stomata, transpiration, and photosynthesis.
## SOLUTION PATHWAY
**Given Information**:
  A mutant plant with reduced ABA sensitivity in its stomata.
  Drought conditions.
  Comparison with a wild-type plant.
**Method & Steps**:
 1. Understanding ABA's role: Abscisic acid (ABA) is a plant hormone that plays a crucial role in drought stress response.  When water is scarce, ABA levels increase, causing stomata to close. This reduces transpiration (water loss through stomata) and helps conserve water. 
  Reasoning: Since the mutant plant has stomata less sensitive to ABA, they will not close as effectively in response to drought.
  Formula/Rule: No specific formula is directly applicable here; this is a qualitative reasoning problem.
 2. Predicting the mutant's response:  With less stomatal closure, the mutant plant will lose more water through transpiration than the wild type under drought conditions.
  Working: The reduced stomatal closure will lead to increased transpiration.  This increased water loss, coupled with drought conditions, will likely limit the plant's ability to carry out photosynthesis efficiently due to water stress.
  Key Point:  Photosynthesis requires water; insufficient water supply will reduce the rate of photosynthesis.
 3. Final Conclusion: The mutant plant will exhibit a higher transpiration rate and a lower photosynthetic rate compared to the wild type under drought conditions.
  Result: Higher transpiration rate and lower photosynthetic rate.
  Verification:  The reasoning aligns with the known roles of ABA and stomata in plant water balance and photosynthesis.
 ## OPTION ANALYSIS
A :x: Lower transpiration rate and higher photosynthetic rate is incorrect because the mutant's stomata are less sensitive to ABA, leading to increased transpiration and reduced photosynthesis under drought.
B ✓: Higher transpiration rate and lower photosynthetic rate is correct because reduced ABA sensitivity leads to increased water loss (transpiration) and consequently, reduced photosynthetic activity due to water stress.
C :x: Lower transpiration rate and lower photosynthetic rate is incorrect because increased transpiration is expected due to reduced ABA sensitivity.
D :x: Higher transpiration rate and higher photosynthetic rate is incorrect because drought conditions and increased transpiration will limit photosynthetic activity.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the effect of ABA:  Students might incorrectly assume that less ABA sensitivity would lead to increased photosynthesis without considering the consequences of increased water loss.
  How to avoid: Focus on the overall water balance and its impact on photosynthesis.
  2.Ignoring drought conditions:  The analysis needs to consider the context of drought—water is a limiting factor.
  How to avoid: Always consider the environmental conditions when analyzing plant responses.
 **Quick Tips**:
  1.Remember ABA's role in stomatal closure and drought tolerance.
  2.Connect water availability to photosynthetic rate.

Mr. NARESH KUMAR K · Answer

Lower transpiration rate and higher photosynthetic rate

Mr. NARESH KUMAR K · Answer

The correct Option is "Higher transpiration rate and lower photosynthetic rate"

Mr. NARESH KUMAR K · Answer

Lower transpiration rate and lower photosynthetic rate

Mr. NARESH KUMAR K · Answer

Higher transpiration rate and higher photosynthetic rate

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