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

Question

The rate of transpiration will be very less in a situation where

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [D]
## CONCEPT FRAMEWORK
**Primary Concept**: Transpiration rate and its influencing factors.
**Related Topics**: Relative humidity, water potential gradient, stomatal opening.
**Prerequisites**: Understanding of transpiration process and its dependence on environmental factors.
## SOLUTION PATHWAY
**Given Information**:
  * The question asks about conditions that result in very low transpiration rate.
**Method & Steps**:
 1. **Understanding Transpiration**: Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems, and flowers. It is driven by the water potential gradient.
     Reasoning: Water moves from high water potential (soil) to low water potential (atmosphere).
 2. **Analyzing Options**: 
      * **Option A**: Sufficient groundwater would likely lead to *higher* transpiration rates as more water is available for uptake by the plant. Therefore, this is incorrect.
      * **Option B**: High wind velocity would *increase* transpiration rate by removing water vapor from the leaf surface, maintaining a steep water potential gradient. Therefore, this is incorrect.
      * **Option C**: Hot and dry environments would also *increase* transpiration rate due to high temperature and low humidity, creating a steep water potential gradient. Therefore, this is incorrect.
     * **Option D**: High relative humidity means the air is already saturated with water vapor. This reduces the water potential gradient between the leaf and the atmosphere, leading to *lower* transpiration rates.
    Key Point: The rate of transpiration is directly proportional to the difference in water potential between the leaf and the surrounding atmosphere.
3. **Final Step**: Select the option that results in the lowest transpiration rate.
    Result: Option D is correct.
    Verification: High humidity reduces the driving force for water evaporation from plant leaves.
## OPTION ANALYSIS
[A] :x: Groundwater availability typically increases transpiration rates.
[B] :x: High wind velocity increases transpiration rates.
[C] :x: Hot and dry environments increase transpiration rates.
[D] ✓: High relative humidity decreases the water potential gradient, thus decreasing transpiration rate.
## LEARNING AIDS
**Common Mistakes**:
 1. Incorrectly associating high water availability with low transpiration. High water availability means more water is available to transpire.
 2. Confusing the effect of wind and humidity on transpiration. High wind removes moisture, and high humidity reduces the gradient.
**Quick Tips**:
 1. Remember that transpiration is driven by the water potential gradient. The steeper the gradient, the higher the transpiration rate.
 2. Think about the air's capacity to hold water. High humidity means the air is already holding a lot of water, so less can evaporate from the leaf.

Mr. NARESH KUMAR K · Answer

Ground water is sufficiently available

Mr. NARESH KUMAR K · Answer

Wind is blowing with a very high velocity

Mr. NARESH KUMAR K · Answer

Environment is very hot and dry

Mr. NARESH KUMAR K · Answer

The correct Option is "Relative humidity is very high"

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