What is exine of pollen made of? State its significance (2marks)
Answers
Answer:
Name the organic materials the exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine. The exine layer is made up of sporopollenin, which is one of the most resistant substances found in nature. ... (2) It helps in pollen dispersal and cross-pollination in some species.
Answer:
ANSWER
Pollen grain is a uninucleate cell with two layered cell wall. Exine is the outer covering of pollen grain which is highly sculptured with sporopollenin; a chemically inert polymer of carotenoid ester which is highly resistant to degradation by any enzyme, as known so far. Option C is correct.
The inner thin cell layer of cellulose/pectin cellulose makes intine; this makes option A incorrect.
Lignin may or may not be present in the outer wall which makes option B incorrect. Correct answer is B.
The sticky oily covering found around surface of pollens is termed as pollen kit. It is not part of pollen wall.