The Question is from neet-botany , and it was created by the author K SURESH KUMAR

Question

Stomatal closure is LEAST likely to be directly induced by:

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Stomatal Regulation
	**Related Topics**: Plant Physiology, Water Relations, Photosynthesis
	**Prerequisites**: Understanding of stomata function and factors influencing their opening and closing.
## SOLUTION PATHWAY
**Given Information**:
	The question asks for the factor that is LEAST likely to induce stomatal closure.
**Method & Steps**:
	1. **Analyze each option's effect on stomatal opening/closure:**
		Reasoning: Stomata regulate gas exchange (CO2 intake for photosynthesis, O2 release) and water loss (transpiration).  Their opening and closing are influenced by environmental and internal factors.
	2. **Identify the factor that promotes opening rather than closure:**
		Working:  High humidity reduces the water potential gradient between the leaf interior and the atmosphere, decreasing transpiration. This favors open stomata.
	3. **Confirm the least likely factor for closure:**
		Result: High humidity is the least likely to directly induce stomatal closure.
		Verification: The other options are known to induce closure under certain conditions.
## OPTION ANALYSIS
[A] :x: Abscisic acid (ABA): A plant hormone that promotes stomatal closure, especially during water stress.
[B] :x: High temperature: Can lead to increased transpiration and water loss, indirectly inducing stomatal closure to conserve water.
[C] :x: Water deficiency: Directly triggers ABA production and stomatal closure to minimize water loss.
[D] ✓: High humidity: Reduces the driving force for transpiration, favoring open stomata. Therefore, it is the least likely to induce closure.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing direct and indirect effects: High temperature can indirectly cause closure due to water loss, but it's not a direct trigger like ABA.
		2. Not considering the water potential gradient: Humidity directly affects this gradient and thus stomatal aperture.
	**Quick Tips**:
		1. Remember ABA as a key hormone for stomatal closure.
		2. Think of humidity as the opposite of dry conditions, which promote closure. High humidity favors open stomata.

K SURESH KUMAR · Answer

Abscisic acid

K SURESH KUMAR · Answer

High temperature

K SURESH KUMAR · Answer

Water deficiency

K SURESH KUMAR · Answer

The correct Option is "High humidity"

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