The Question is from neet-botany mineral-nutrition , and it was created by the author B VENKAT

Question

Which of the following is NOT a mechanism involved in the uptake of mineral ions by plant roots?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Mineral ion uptake in plant roots
 **Related Topics**: Plant physiology, membrane transport, active transport, passive transport, facilitated diffusion, exocytosis, endocytosis
 **Prerequisites**: Understanding of membrane transport mechanisms.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the mechanism NOT involved in mineral ion uptake by plant roots.
**Method & Steps**:
1. Analyze each option to determine its role in mineral ion uptake.
  Reasoning:  Plant roots absorb mineral ions from the soil solution. This process involves various transport mechanisms across the root cell membranes.
  Formula/Rule: N/A
2. Identify the mechanism that is not relevant to the uptake process.
  Working: Let's examine each option:
        * Active transport: This mechanism uses energy (ATP) to move ions against their concentration gradient, from low concentration (soil solution) to high concentration (root cells). This is crucial for mineral ion uptake.
        * Passive transport: This involves the movement of ions down their concentration gradient, without energy expenditure. It can contribute to ion uptake, particularly for ions present in high concentrations in the soil.
        * Facilitated diffusion: This is a type of passive transport where ions move down their concentration gradient with the help of membrane proteins. This aids in efficient ion uptake.
        * Exocytosis: This is a process where vesicles fuse with the plasma membrane, releasing their contents outside the cell.  This is involved in secretion, not uptake.
 3. Determine the incorrect option.
  Result: Exocytosis is the process of releasing substances from the cell, not taking them in. Therefore, it is not involved in mineral ion uptake.
  Verification: All other options are known mechanisms for mineral ion uptake in plant roots.
 ## OPTION ANALYSIS
A : ✓: Active transport is a key mechanism for mineral ion uptake against the concentration gradient.
B : ✓: Passive transport allows movement of ions down the concentration gradient, contributing to uptake.
C : ✓: Facilitated diffusion assists passive transport of ions across membranes.
D : x: Exocytosis is the process of releasing substances from the cell; it's the opposite of uptake.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing exocytosis with endocytosis: Endocytosis is the process of taking substances into the cell, while exocytosis is the opposite.
  2.Overlooking the role of passive transport: Passive transport, though not as energy-intensive as active transport, still plays a significant role in mineral ion uptake.
 **Quick Tips**:
  1.Remember the direction of movement: Uptake involves movement into the cell, while exocytosis involves movement out of the cell.
  2.Focus on the energy requirement: Active transport requires energy (ATP), while passive transport and facilitated diffusion do not.

B VENKAT · Answer

Active transport

B VENKAT · Answer

Passive transport

B VENKAT · Answer

Facilitated diffusion

B VENKAT · Answer

The correct Option is "Exocytosis"

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