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Identify A, B, C and D structures shown in above diagram of female gametophyte -
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In the given figure of mature embryo sac, the structure marked as A, B, C, D, and E are respectively synergid, polar nuclei, central cell and antipodal cells. Embryo sac is the female gametophyte of a seed plant. containing the egg, synergids, and polar and antipodal nuclei. In this, fusion of the antipodal and a pollen generative nucleus forms the endosperm. The embryo sac develops in the central portion of the ovule (nucellus), where the maternal macrosporocyte, as a result of meiotic division, forms four haploid cells (a tetrad of macrospores), of which one develops (the rest atrophy). During the development of the embryo sac there are three successive synchronous mitotic divisions of its nuclei, so that their number increases in the progression 1: 2: 4: 8 and they are distributed evenly along the ends of the growing embryo sac.
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Question Text | Identify A, B, C and D structures shown in above diagram of female gametophyte - |
Topic | Sexual Reproduction in Flowering Plants |
Subject | Biology |
Class | Class 12 |
Answer Type | Text solution:1 |
Upvotes | 104 |