Question

Name the chemical substance present in exine and intine of
pollen grain- Draw a diagram of pollen grain and label
following parts.
¼i½ Exine ¼ii½ intine
¼iii½ Vegetative cell ¼iV½ Germinal cell.

Answer 1

Answer:

The intine, or inner layer, consists primarily of cellulose and pectins. The exine, or outer layer, is composed of a highly decay-resistant chemical called sporopollenin. The exine usually has one or more thin areas, or pores, through which the pollen tubes germinate, and the thick area of the exine is usually highly sculptured. The number of pores and pattern of exine sculpturing are characteristic within an angiosperm family, genus, and often within a species.

here is the diagram: