Question

Polygonum type of embryo sac/ typical female gametophyte of angiosperms is

• A. $7$ celled, $8-$nucleate
• B. $8$ celled, $7-$nucleate
• C. $8$ celled, $8-$nucleate
• D. $7$ celled, $7-$nucleate

Answer 1

The correct option is A $7$ celled, $8-$nucleate

Polygonum embryo sac
The embryo sac within the ovule is the female gametophyte in angiosperms. A typical embryo sac is generally of the polygonum type.
A polygonum embryo sac is a monosporic embryo sac which arises from a single haploid megaspore with the help of $3$ mitotic nuclear divisions which leads to the formation of $8$ nuclei
The two polar nuclei at the centre fuse together to form the central cell. Thus, the polygonum ovary is typically $7-$celled and $8-$nucleate.
A mature polygonum embryo sac contains:
1)Egg apparatus with one egg and two synergid cells,
2)Three antipodal cells
3) A central cell with two polar nuclei.


Final answer
(B) $7$ celled, $8-$nucleate