Correct Answer: Option A
Explanation:
Lignin is a complex organic polymer deposited in the secondary cell wall of xylem vessels and sclerenchyma fibers, providing rigidity, strength, and water resistance. It is the major non-carbohydrate component of wood. Cellulose is the main polysaccharide in the primary wall, chitin is in fungi and arthropods, pectin is in the middle lamella and primary wall.
This question belongs to:
Science
Biology
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