Question

Cotton fibre has maximum amount of cellulose in

• A. Cuticle
• B. Primary cell wall
• C. Secondary cell wall
• D. Lumen

Hint:

In plant fibers, especially cotton, the secondary cell wall is the layer with the highest concentration of cellulose, which contributes to its strength and durability.

Answer 1

The Correct Option is C

Cotton fibers are primarily composed of cellulose, a polysaccharide that forms the structure of plant cell walls. Cotton fibers consist of several layers, with each layer serving a distinct function. The two most important components in terms of cellulose content are the primary cell wall and the secondary cell wall. 1. Primary Cell Wall: This is the first layer that forms when the cell is growing. It is flexible and has a relatively low content of cellulose compared to the secondary cell wall. The primary cell wall contains a mix of cellulose, hemicellulose, and pectin. 2. Secondary Cell Wall: After the cell has stopped growing, the secondary cell wall is formed. This layer is much thicker and contains a much higher concentration of cellulose, providing strength and rigidity to the cell. It is the secondary cell wall that has the maximum amount of cellulose in cotton fibers, making it the most important component for the fiber's strength. 3. Cuticle: This is a waxy layer that covers the outermost part of the plant cell wall, protecting it from water loss and pathogens. It is not involved in cellulose content. 4. Lumen: The lumen is the central cavity of the fiber, containing mostly air or water, and is not a source of cellulose. Therefore, the cotton fiber has the maximum amount of cellulose in the secondary cell wall, making (C) the correct answer.