In the Polygonum type of embryo sac,all cells | vedclass

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(A) The $Polygonum$ type of embryo sac is the most common type of embryo sac in angiosperms,which is $7$-celled and $8$-nucleate.
In this development

Vedclass · Accepted Answer

Haploid and diploid

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(A) The $Polygonum$ type of embryo sac is the most common type of embryo sac in angiosperms,which is $7$-celled and $8$-nucleate.
In this development,a single megaspore mother cell undergoes meiosis to produce four haploid megaspores.
Three megaspores degenerate,and the remaining functional megaspore undergoes three successive mitotic divisions to form the embryo sac.
Since these divisions are mitotic,all the resulting cells (antipodal cells,synergids,egg cell,and the central cell with two polar nuclei) are haploid $(n)$,except for the central cell which contains two haploid polar nuclei (often fusing to form a diploid secondary nucleus).
Therefore,all the individual cells within the mature $Polygonum$ type embryo sac are haploid.

In the $Polygonum$ type of embryo sac,all cells are .....

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