Question

The interfibrillar material of the secondary wall is chiefly made up of

• A. Fat
• B. Wax
• C. Lignin
• D. Glucose

Answer 1

The correct option is C Lignin

Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Most plants exhibit an increase in girth, apart from primary growth. This increase is called secondary growth. The tissues involved are the two lateral meristems: vascular cambium and cork cambium. The cambium possess hard and extremely thick secondary walls due to uniform deposition of lignin.

So, the answer is C.