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One of the most resistant biological material is

1. lignin
2. hemicellulose
3. lignocellulose
4. sporopollenin

Correct answer: sporopollenin

Solution

Sporopollenin is an exceptionally resistant biopolymer that forms the outer wall of spores and pollen grains. It resists chemical, enzymatic, and environmental degradation far more than lignin, hemicellulose, or lignocellulose.

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