A) sporopollenin
B) cellulose
C) pectocellulose
D) lignin
Correct Answer: A
Solution :
Each pollen grain contains two-layered cell wall-the outer exine and inner intine. Exine is composed of sporopollenin, which is most resistant biological material for microbial and chemical decomposition. Due to this, pollen grains are well preserved during fossilization.
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