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Class 12 Tuition > Learn Class XI-XII Tuition (PUC) > Why embryo sac in flower is called 7 celled and 8 nucle...
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Why embryo sac in flower is called 7 celled and 8 nucleate?

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M.sc

Number of cells = 3 antipodal cells + 2 synergids + 1 egg cell + 1 central cell= 7 cells. BUT the CENTRAL CELL HAS TWO POLAR NUCLEI IN IT. Therefore total number of nuclei = 7 + 1 extra in central cell= 8 nucleate.
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That's because there are 3 antipodals, 2 synergids, 1 egg cell and 1 central cell after the fusion of the two polar nuclei. The sum adds up to 07. Just before the fusion of the two polar nuclei, there are 8 nuclei. Hence 7 celled but 8 nucleate.
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Biologist

It is so because after undergoing so many divisions, the embryo sac when become fully mature, it contains 7 cells and 8 nucleii. 3 antipodal cells, 3 synergids , 1 polar cell 3 nucleii of each antipodal cells, 3 nucleii of each synergids and 2 nucleii present in polar cell
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The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other...
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The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other nucleus moves towards the chalazal end. Then, these nuclei divide at their respective ends and re-divide to form eight nucleate stages. As a result, there are four nuclei each at both the ends i.e., at the micropylar and the chalazal end in the embryo sac. At the micropylar end, out of the four nuclei only three differentiate into two synergids and one egg cell. Together they are known as the egg apparatus. Similarly, at the chalazal end, three out of four nuclei differentiates as antipodal cells. The remaining two cells (of the micropylar and the chalazal end) move towards the centre and are known as the polar nuclei, which are situated in a large central cell. Hence, at maturity, the female gametophyte appears as a 7-celled structure, though it has 8 nucleate. read less
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Biologist

The embryo sac formation is produced during meiosis during megasporogenesis. The embryo sac has three celled egg apparatus. One egg cell and two synergids, three antipodal and two polar nuclei, totally 7- celled. Hence the embryo sac is 7- celled and 8- nucleated.
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i m a maths tutor. sorry dude.
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The embryo sac formation is produced during meiosis during megasporogenesis. The enbryo sac has three celled egg apparatus.
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It is called so because during the process of mega prognosis only one cell remain out of the four and other three degenerate then the fourth cell grows and it's nucleus divides by mitotic division into 8 nucleus after that the nucleus develops cytoplasm and cell membrane around them but two nuclei out...
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It is called so because during the process of mega prognosis only one cell remain out of the four and other three degenerate then the fourth cell grows and it's nucleus divides by mitotic division into 8 nucleus after that the nucleus develops cytoplasm and cell membrane around them but two nuclei out of 8 as the others have gone to two opposite poles in group of three the remaining two does not grow different cell membranes around and hence remain in the di-karyon phase for some time they share one cell hence it is said 8 nucleated and 7 celled. read less
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Number of cells = 3 antipodal cells + 2 synergids + 1 egg cell + 1 central cell= 7 cells. But the central cell has two polar nuclei in it before the fusion of two polar nuclei. So there are eight nuclei. Hence seven celled but eight nucleate.
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