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

Question

Root pressure is typically highest under which of the following conditions?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Root pressure and its dependence on soil water potential and transpiration.
 **Related Topics**: Water potential, osmosis, transpiration pull, xylem.
 **Prerequisites**: Understanding of water movement in plants, osmosis, and the factors affecting transpiration.
## SOLUTION PATHWAY
**Given Information**:
  The options present different combinations of soil moisture and transpiration rate.
  Root pressure is the force that pushes water upwards in plants.
**Method & Steps**:
 1. Analyze the effect of soil moisture on root pressure.
  Reasoning: High soil moisture means a higher water potential in the soil.  This facilitates osmosis, leading to increased water uptake by the roots, thus increasing root pressure.
  Formula/Rule:  Water moves from regions of high water potential to regions of low water potential.
 2. Analyze the effect of transpiration rate on root pressure.
  Reasoning:  High transpiration rate means a high rate of water loss from the leaves. This creates a strong transpiration pull, which can actually counteract root pressure.  A low transpiration rate allows root pressure to build up more effectively.
  Key Point: Transpiration pull is a major driving force in water movement in tall plants; it often overshadows root pressure.
 3. Combine the effects of soil moisture and transpiration rate.
  Result:  High soil moisture (high water potential) ensures ample water uptake, while low transpiration rate minimizes water loss, allowing root pressure to build up to its maximum.
  Verification:  Consider the extreme cases.  If soil is dry (low soil moisture), root pressure will be low regardless of transpiration rate.  If transpiration rate is very high, the transpiration pull will dominate, reducing root pressure.
 ## OPTION ANALYSIS
A :x: High soil moisture and high transpiration rate: High transpiration will counteract the effect of high soil moisture, leading to a moderate root pressure, not the highest.
B :x: Low soil moisture and low transpiration rate: Both factors are unfavorable for high root pressure.
C :x: Low soil moisture and high transpiration rate: Low soil moisture limits water uptake, and high transpiration further reduces root pressure.
D ✓: High soil moisture and low transpiration rate: High soil moisture promotes water uptake, and low transpiration allows root pressure to build up without being counteracted by the transpiration pull.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Ignoring the opposing effect of transpiration on root pressure: Students might focus solely on soil moisture.
  [How to avoid]: Remember that transpiration pull is a significant factor in water movement and can significantly reduce root pressure.
  2.Confusing the roles of root pressure and transpiration pull: Root pressure is a minor force compared to transpiration pull in tall plants.
  [How to avoid]:  Understand the relative magnitudes of these forces and their interplay.
 **Quick Tips**:
  1.Think about the conditions that maximize water uptake while minimizing water loss from the plant.
  2.Remember that root pressure is most significant in shorter plants or under conditions of low transpiration.

Mr. NARESH KUMAR K · Answer

High soil moisture and high transpiration rate

Mr. NARESH KUMAR K · Answer

Low soil moisture and low transpiration rate

Mr. NARESH KUMAR K · Answer

Low soil moisture and high transpiration rate

Mr. NARESH KUMAR K · Answer

The correct Option is "High soil moisture and low transpiration rate"

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