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

Question

The pressure required to prevent the swelling of a gelatine block when immersed in water is called:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Imbibition
 **Related Topics**: Osmosis, Water potential, Gel properties
 **Prerequisites**: Understanding of water movement across semi-permeable membranes, pressure and its effects on materials.
## SOLUTION PATHWAY
**Given Information**:
A gelatine block is immersed in water. Swelling is prevented.
**Method & Steps**:
 1. Identify the process: When a gelatine block is placed in water, water molecules move into the gelatine due to imbibition.  Imbibition is the absorption of water by hydrophilic substances causing them to swell.
  Reasoning: Water enters the gelatine due to the attractive forces between water molecules and the gelatine molecules.
  Formula/Rule: No specific formula is needed for this conceptual understanding.
 2. Understand the pressure: To prevent swelling, an external pressure must be applied to counteract the imbibition pressure. This external pressure must equal and oppose the force driving water into the gelatine.
  Working: The pressure required to stop the swelling is directly related to the imbibition pressure. 
  Key Point: The pressure is not osmotic pressure because osmosis refers to the movement of water across a semi-permeable membrane,  while imbibition is the absorption of water by a hydrophilic colloid.
 3. Final step: The pressure required to prevent swelling is therefore the imbibition pressure.
  Result: Imbibition pressure
  Verification: The definition of imbibition pressure aligns perfectly with the scenario described.
 ## OPTION ANALYSIS
[A] :x: Osmotic pressure:  Osmotic pressure is the pressure required to prevent osmosis (movement of water across a semi-permeable membrane). While related, it's not the direct pressure opposing the swelling of the gelatine block in this specific scenario.
[B] :x: Turgor pressure: Turgor pressure is the pressure exerted by the cell contents against the cell wall in plant cells. This is not relevant to a gelatine block.
[C] :x: Wall pressure: Wall pressure refers to the pressure exerted by a cell wall on its contents. This is not applicable to a gelatine block.
[D] ✓: Imbibition pressure: This is the pressure exerted by the imbibition of water into the gelatine block. It directly opposes the swelling and is the correct answer.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing imbibition with osmosis: Remember that imbibition is the absorption of water by hydrophilic colloids without a semipermeable membrane, while osmosis requires a semipermeable membrane.
  2.Incorrectly applying other types of pressure: Osmotic, turgor, and wall pressure are not directly relevant to this specific question about a gelatine block.
 **Quick Tips**:
  1.Focus on the definition of imbibition and its relation to pressure.
  2.Visualize the water molecules entering the gelatine and the external pressure needed to counter this process.

Mr. NARESH KUMAR K · Answer

Osmotic pressure

Mr. NARESH KUMAR K · Answer

Turgor pressure

Mr. NARESH KUMAR K · Answer

Wall pressure

Mr. NARESH KUMAR K · Answer

The correct Option is "Imbibition pressure"

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