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B
Heteropolysaccharide
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C
Protein
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D
Fatty substance
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Solution
The correct option is D Fatty substance
Sporopollenin is the most resistant known biological material which is found in the exine of the pollen grains. Sporopollenin is resistant to chemical and microbial decomposition. Due to this, pollen grains are well preserved during fossilization. The exact composition of sporopollenin is not known but analyses and studies have revealed that it is composed of long chain fatty acids along with some other biopolymers like phenolics and carotenoids. Therefore it is majorly made of fatty substance.