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

Question

Which of the following is an example of diffusion in plants?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Diffusion
 **Related Topics**: Plant transport, root hairs, mineral uptake
 **Prerequisites**: Understanding of diffusion as the passive movement of substances from a region of high concentration to a region of low concentration.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify an example of diffusion in plants.
  Options: Transpiration pull, transport of sugars through phloem, uptake of minerals by root hairs, movement of water through xylem.
**Method & Steps**:
 1. Analyze each option to determine if it involves diffusion.
  Reasoning: Diffusion is a passive process driven by the concentration gradient.  It doesn't require energy.
 2. Evaluate each option based on the definition of diffusion.
  Working:
  * **Transpiration pull:** This is the movement of water upwards in the xylem due to evaporation from leaves.  While water movement is involved, it's primarily driven by cohesion-tension, not diffusion.
  * **Transport of sugars through phloem:** This is active transport, requiring energy (ATP) and involving pressure gradients. It's not diffusion.
  * **Uptake of minerals by root hairs:** Minerals are absorbed from the soil solution into root hairs.  The concentration of minerals is typically higher in the soil solution than inside the root hair, allowing for passive uptake via diffusion.
  * **Movement of water through xylem:** This primarily involves bulk flow driven by transpiration pull, not diffusion.
 3. Identify the option that accurately reflects diffusion.
  Result: Uptake of minerals by root hairs is the best example of diffusion in plants.
  Verification: The process involves the movement of minerals from a high concentration (soil) to a low concentration (root hair) without energy expenditure.
## OPTION ANALYSIS
A :x: Transpiration pull is a bulk flow process driven by evaporation and cohesion-tension, not diffusion.
B :x:  Phloem transport is active transport, requiring energy.
C ✓: Uptake of minerals by root hairs is a classic example of diffusion in plants.  Minerals move passively from the soil (high concentration) into the root hairs (low concentration).
D :x: Water movement in xylem is mainly through bulk flow driven by transpiration.
## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing diffusion with other transport mechanisms like active transport or bulk flow: Understand the difference between passive and active processes.
  2.Overlooking the concentration gradient:  Diffusion requires a concentration gradient; substances move from high to low concentration.
 **Quick Tips**:
  1. Remember that diffusion is a passive process driven by concentration gradient and does not require energy.
  2. Visualize the movement of molecules from an area of high density to an area of low density.

Mr. NARESH KUMAR K · Answer

Transpiration pull

Mr. NARESH KUMAR K · Answer

Transport of sugars through phloem

Mr. NARESH KUMAR K · Answer

The correct Option is "Uptake of minerals by root hairs"

Mr. NARESH KUMAR K · Answer

Movement of water through xylem

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