Question

Which one produces an embryo sac?

• A. Embryo cell
• B. Megaspore mother cell
• C. Microspore
  
• D. Megaspore

Answer 1

The correct option is D Megaspore

Megaspore mother cell
Megaspore mother cell is the diploid sporogenous cell present in the megasporangium (ovules). It divides meiotically to form $4$ haploid megaspores, out of which $3$ degenerate and $1$ remains functional.

Megaspore
The functional megaspore is the first haploid cell of the female gametophyte or embryo sac. It undergoes $3$ mitotic divisions to form a mature $7-$celled and $8-$nucleated embryo sac.


Microspore
Microspores are haploid male gametophytes produced by meiotic division of microspore mother cells. Microspores get transformed into pollen grains. It usually undergoes mitotic divisions to form a $3-$celled mature pollen grain having 1 vegetative cell and $2$ male gametes.

Embryo cell
Embryo is formed within the embryo sac after fertilisation. It is produced due to repeated mitotic divisions of the diploid zygote formed after fusion of male and female gametes.

Final answer
(B) Megaspore