Q.Explain why sporopollenin is considered one of the most resistant organic materials known, and state its biological significance.

This chemical toughness protects the male gametophyte's genetic material and makes fossil pollen a valuable tool in dating and identifying past vegetation (palynology). …

Sporopollenin, the material of which the exine (outer pollen wall) is made, is considered one of the most resistant organic materials known. No enzyme that degrades it has yet been identified, and it is unaffected by treatment with strong acids or alkalis, and is stable even at very high temperatures. This extraordinary chemical inertness means pollen exine can survive essentially unaltered for extremely long periods, including in geological sediments long after the rest of the pollen grain and the plant that produced it have decayed. …

State sporopollenin's chemical resistance first, then connect that property to two significances: protecting the living pol …

Confusing sporopollenin (exine material) with cellulose/pectin (intine material) -- only the exine's …