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

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Question

(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

Vedclass · Answer

(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 .....

Similar Questions

$A$ typical mature embryo sac of an angiosperm is:

Which process occurs in the megaspore mother cell to form megaspores?

In an anatropous ovule,what is the orientation of the micropyle?

The three cells present at the chalazal end form $.....P......$,and the three cells present at the micropylar end form $.....Q.....$.
$\quad\quad\quad \quad \text { P } \quad\quad\quad \text { Q }$

$A$: Anatropous ovule is a resupinate ovule.
$R$: The body of the ovule is completely bent with the hilum close to the micropylar end.

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