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

Question

A dry wooden block and a dry gelatine block of equal mass are placed in water.  The gelatine block imbibes considerably more water than the wooden block. This difference is primarily attributed to:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Imbibition and hydrophilic properties of materials
 **Related Topics**: Osmosis, water potential, colloids
 **Prerequisites**: Understanding of water absorption mechanisms in different materials.
## SOLUTION PATHWAY
**Given Information**:
  Two blocks of equal mass (wood and gelatine) are placed in water.
  Gelatine absorbs significantly more water than wood.
**Method & Steps**:
 1. Analyze the properties of wood and gelatine.
  Reasoning: Wood is primarily composed of cellulose, hemicellulose, and lignin, which are relatively hydrophobic (water-repelling). Gelatine, on the other hand, is a protein derived from collagen and is rich in hydrophilic (water-attracting) groups.
  Formula/Rule: No specific formula is applicable here. This is a qualitative analysis based on material properties.
 2. Consider the effect of hydrophilic groups.
  Working: The hydrophilic groups in gelatine (e.g., hydroxyl, carboxyl, amino groups) form hydrogen bonds with water molecules, leading to significant water absorption. Wood's hydrophobic components hinder water absorption.
  Key Point: The number and type of hydrophilic groups directly influence the extent of water imbibition.
 3. Determine the primary reason for the difference in water absorption.
  Result: The greater number of hydrophilic colloids in gelatine is the primary reason for its higher water absorption compared to wood.
  Verification: The explanation aligns with the known properties of wood and gelatine and their interactions with water.
 ## OPTION ANALYSIS
A :x: The density difference is not the primary factor influencing water absorption in this scenario.
B ✓: The presence of numerous hydrophilic colloids in gelatine explains the significantly higher water absorption.
C :x: While lignin does repel water, the presence of hydrophilic groups in gelatine is the more significant factor.
D :x: Osmotic potential plays a role in water movement, but the difference in hydrophilic properties is the dominant factor in this case.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing density with water absorption capacity: Density does not directly determine water absorption ability.
  2.Overlooking the role of hydrophilic groups: Failing to consider the impact of hydrophilic groups on water absorption.
 **Quick Tips**:
  1.Remember that hydrophilic materials readily absorb water, while hydrophobic materials repel water.
  2.Consider the chemical composition of materials when analyzing their water absorption properties.

Mr. NARESH KUMAR K · Answer

The higher density of wood compared to gelatine.

Mr. NARESH KUMAR K · Answer

The correct Option is "The greater number of hydrophilic colloids in gelatine compared to wood."

Mr. NARESH KUMAR K · Answer

The presence of lignin in wood, which repels water.

Mr. NARESH KUMAR K · Answer

The lower osmotic potential of gelatine compared to wood.

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