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

Question

Which of the following statements regarding the chemical composition of the secondary cell wall is INCORRECT?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant Cell Wall Structure and Composition
 **Related Topics**:  Primary cell wall, lignin, cellulose, hemicellulose, pectin, suberin, cutin
 **Prerequisites**: Basic understanding of plant cell biology and the components of plant cell walls.
## SOLUTION PATHWAY
**Given Information**:
  Four statements about the chemical composition of the secondary cell wall.
  We need to identify the incorrect statement.
**Method & Steps**:
 1. Analyze each statement individually to determine its accuracy.
  Reasoning:  The secondary cell wall is a rigid layer that provides structural support to plant cells. Its composition differs significantly from the primary cell wall.
 2. Evaluate the chemical components mentioned in each option.
  Working:
		* **Option A:** The secondary cell wall can indeed contain lignin (for rigidity), suberin (for waterproofing), or cutin (for waterproofing), depending on the cell type and function.
		* **Option B:** The secondary cell wall often displays a layered structure, commonly denoted as S1, S2, and S3 layers, each with a specific cellulose microfibril orientation.
		* **Option C:** This statement is incorrect. While the primary cell wall is rich in pectin and hemicellulose, the secondary cell wall is predominantly composed of cellulose, with lignin being a significant component in many cases. Pectin and hemicellulose are present in much smaller quantities compared to cellulose in the secondary cell wall.
		* **Option D:** Cellulose microfibrils in the secondary cell wall are arranged in a highly ordered and parallel fashion, contributing to its strength and rigidity. This is in contrast to the more loosely organized arrangement in the primary cell wall.
 3. Identify the incorrect statement.
  Result: Option C is the incorrect statement.
  Verification: The composition of the secondary cell wall differs significantly from the primary cell wall, with a much higher proportion of cellulose and lignin.
 ## OPTION ANALYSIS
A ✓: Correct. Lignin, suberin, and cutin can all be components of the secondary cell wall.
B ✓: Correct. The layered structure (S1, S2, S3) is a characteristic of many secondary cell walls.
C :x: Incorrect. Pectin and hemicellulose are less abundant in the secondary cell wall compared to cellulose and lignin.
D ✓: Correct. Cellulose microfibrils are more parallel in the secondary cell wall than in the primary cell wall.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the composition of the primary and secondary cell walls: Remember the primary cell wall is rich in pectin and hemicellulose, while the secondary cell wall is primarily cellulose and lignin.
  2.Overlooking the role of lignin in the secondary cell wall: Lignin is a crucial component of the secondary cell wall, providing significant strength and rigidity.
 **Quick Tips**:
  1.Focus on the key differences between primary and secondary cell walls in terms of composition and function.
  2.Remember the layered structure (S1, S2, S3) of the secondary cell wall and the parallel arrangement of cellulose microfibrils.

Mr. NARESH KUMAR K · Answer

It may contain lignin, suberin, or cutin.

Mr. NARESH KUMAR K · Answer

It often has multiple layers, denoted as S1, S2, and S3.

Mr. NARESH KUMAR K · Answer

The correct Option is "It predominantly contains pectin and hemicellulose."

Mr. NARESH KUMAR K · Answer

Cellulose microfibrils are arranged in a more parallel fashion compared to the primary wall.

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