Solution

Sporopollenin in the exine is highly resistant.

Sporopollenin cannot be degraded by enzymes, strong acids or alkali; therefore it is helpful in preserving pollen as fossils. Pollenkitt – helps in insect pollination. Cellulosic intine – inner layer of the pollen wall, made up of cellulose and pectin. Oil content – no role in pollen preservation.

Concept sporopollenin-exine

Sexual Reproduction in Flowering Plants in past papers

126 questions from this chapter have appeared across 26 exam years.