Question

Cell wall consists of

• A. Lignin, hemicellulose, pectin and lipid
• B. Hemicellulose pectin, protein and lipid
• C. Cellulose, hemicellulose, pectin and lignin
• D. Cellulose, hemicellulose, tubulin and lignin

Answer 1

Answer: (C)

Cellulose, hemicellulose, pectin and lignin

• A cell wall is a tough and flexible structural layer that surrounds cell membrane in plants, algae and most prokaryotes
  
• It is made up of-

1. Cellulose is an important component of plant cell walls that make the plant stems, leaves and branches rigid, they are present in the form of cellulosic microfibrils (fibre-like strands) in the inner layer of primary wall.
   
2. Pectin is an essential polysaccharide present in the plant cell wall that allows the extension of a primary cell wall and in plant growth.
   
3. Hemicellulose is a heteropolymer (arabinoxylans) which is present along with cellulose in the cell walls.
4. Lignin is the main component of the secondary cell wall of plants.
   

• The plant cell wall consists of cellulose, hemicellulose and lignin in the ratio 4:3:3.
  
• So, the correct answer is 'Cellulose, hemicellulose, pectin and lignin'.