A) A - germ pore, B-generative cell, C - intine, D -exine, E - vegetative cell
B) A - germ pore, B - generative cell, C - exine, D -intine, E - vegetative cell
C) A - intine, B - exine, C - germ pore, D -generative cell, E - vegetative cell
D) A - exine, B - intine, C - vegetative cell, D -germ pore, E - generative cell
Correct Answer: D
Solution :
Pollen grain is the mother cell of the male gametophyte. It is covered by two layered wall, on the outside by exine and on inner side by in tine. Exine is mainly made up of sporopollenin, one of the most resistant biological material known. Exine is very thin or lacking at the apical pore region called germ pore. In tine is made up of pectin and cellulose. Development of male gametophyte begins inside the microsporangium. First division of cell is mitotic producing two unequal - cells a larger vegetative cell and a smaller generative cell. Pollen grain at the time of pollination may be 2-celled (one tube cell + one generative cell) or 3- celled cone tube cell + 2 male gametes).
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