Question

Strength and rigidity of cell wall is due to __________.

• A. Suberin
• B. Lignin
• C. Cellulose
• D. Pectin

Answer 1

The correct option is B Lignin

• The cell wall is a tough, rigid outer layer of the plant and fungal cells. It provides the cells with structural support and protection.
• The strongest component of the cell wall is a carbohydrate called cellulose, a polymer of glucose.
• When the additional layer of lignin is added to the primary cell wall a secondary cell wall is formed. The secondary cell wall increases the rigidity and strength of the cell. It is mainly present in permanent plant tissues.
• Suberin functions as a physical barrier that prevents water loss from the tissues it surrounds as well as providing protection against pathogens.
  
• Pectin helps to keep the walls of adjacent cells joined together.
  

So, the correct answer is option B, i.e., Lignin.