Question

Embryo sac represents
A. Megaspore
B. Megagametophyte
C. Megasporangium
D. Female Gamete

Answer 1

The megaspore mother cells undergo meiosis i.e the reduction division. This reduction division gives megaspores. These megaspores grow and develop into the female gametophyte. The female gametophyte is also known as the megagametophyte.

Complete answer:
To know the correct answer to the question, we must be well aware of the embryo sac.

Now we know that the megaspore mother cells divide and ultimately form the megagametophyte. This entire process of the development of the megagametophyte from the megaspore is known as megagametogenesis.
In angiosperms or flowering plants this megagametophyte is highly reduced. It is dependent on the sporophytic tissue.
The embryo sac is nothing but the female gametophyte which is also called the megagametophyte.
The egg cells are produced inside this embryo sac. The embryo sac also consists of synergids, antipodal cells and central cells.
Depending upon the number of nuclei which take part in the development of the embryo sac, it can be divided into 3 types:

Monosporic embryo sac
Bisporic embryo sac
Tetrasporic embryo sac

Since, now we are well aware of the embryo sac therefore, the correct answer to the question is megagametophyte.

Note: Here it must be noted that the female gamete is nothing but the egg cells which are produced inside the embryo sac. The megasporangium is the entire structure which is known to form the ovule. It consists of the protective covering which keeps the ovule safe.