a) Cellulose
b) Pectin
c) Hemicellulose
d) Lignin
Answer: b
Explanation: Pectin is not a constituent of the wood cell wall. It is a heteropolysaccharide present in primary cell walls of plants. It is responsible for the structural integrity of the cell. There are three main constituents of the wood cell wall – Cellulose, Hemicellulose and Lignin.
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