A) Lignin
B) Cutin
C) Suberin
D) Sporopollenin
Correct Answer: D
Solution :
Sporopollenin is a polymer, tougher than lignin but with similar properties, composed chiefly of carotenoids makes spores and pollen grains of plants resistant to biodegradation is the hardest plant product. Lignin is the main component of secondary walls and wood of plants, composed of phenylpropanoid units which provide a right matrix for cellulose fibres. Cutin is a transparent waxy substance constituting, together with cellulose, the cuticle of plants. Suberin is a wax like fatty substance, occurring in cork cell walls and in between other cells, that on alkaline hydrolysis yields chiefly suberic acid.
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