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Bschible the derebenentscaibhe the deebement of in.ale en ee phuyia |
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Answer» Development of male gametophyte starts in pollen grains, while still present in the microsporangium or pollen sac (precocious germination). Microspore undergoes only two mitotic divisions. First mitotic division leads to the formation of a vegetative cell and generative cell. Vegetative cell is also called tube cell. The vegetative cell is bigger has abundant food reserve and large irregular shaped nucleus. These cells do not possess any cell wall, hence represented only by cell membranes. A temporary callose wall is laid down between the two cells (Groska-Bry-Lass, 1967). The callose wall spreads between the generative cells and the intine to finally pinch it off. Soon, this callose wall dissolves and generative cell lies freely in the cytoplasm of vegetative cell. |
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