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

Question

A researcher applies a potent respiratory inhibitor to the root cells of a plant. Which of the following would be MOST directly affected, ultimately impacting root pressure?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Root pressure and its dependence on active transport.
 **Related Topics**: Plant water transport, osmosis, transpiration, respiratory inhibitors.
 **Prerequisites**: Understanding of active transport, water potential, and root pressure mechanisms.
## SOLUTION PATHWAY
**Given Information**:
A respiratory inhibitor is applied to root cells.  Respiratory inhibitors block cellular respiration, which is the process that provides ATP (energy) for cellular processes.
**Method & Steps**:
1. Identify the role of root cells in root pressure generation.
	Reasoning: Root pressure is generated by the active transport of ions (primarily minerals) into the xylem in the roots. This lowers the water potential in the xylem, causing water to move from the soil into the roots via osmosis.
	Formula/Rule: No specific formula, but understanding the relationship between active transport, water potential, and osmosis is crucial.
2. Determine the impact of a respiratory inhibitor on root cell function.
	Working:  Since cellular respiration is inhibited, ATP production is reduced or stopped.  Active transport processes, which require ATP, will be directly affected and consequently slowed or cease.
	Key Point: Active transport is an energy-requiring process.
3. Relate the effect to root pressure.
	Result: The reduced or absent active transport of ions into the xylem will lead to a decrease or loss of root pressure.  The other options are less directly affected.
	Verification:  If active transport is impaired, the water potential gradient driving osmosis into the xylem would be reduced, directly impacting root pressure.
## OPTION ANALYSIS
A :x: The water potential gradient between soil and root hairs is affected indirectly, as it depends on the active transport within the root cells.
B :x: Cohesion and adhesion are properties of water molecules and are not directly affected by respiratory inhibition.
C :x: Transpiration pull originates in the leaves and is not directly related to the root pressure generated in the roots.
D ✓: Active transport of ions into the xylem is the direct process driving root pressure.  Inhibiting respiration directly impacts this process.
## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing passive and active transport:  Root pressure relies on active transport, not passive transport.
  2.Overlooking the energy requirement of active transport:  Active transport requires ATP, which is produced during cellular respiration.
 **Quick Tips**:
  1.Remember that root pressure is driven by active transport in the roots.
  2.Respiratory inhibitors prevent ATP production, which is necessary for active transport.

K SURESH KUMAR · Answer

Water potential gradient between the soil and root hairs

K SURESH KUMAR · Answer

Cohesion and adhesion of water molecules in the xylem

K SURESH KUMAR · Answer

Transpiration pull from the leaves

K SURESH KUMAR · Answer

The correct Option is "Active transport of ions into the xylem"

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