100 meiotic divisions required... for production of 100 embryo sac...option 4...

Meiosis and Embryo Sac Formation:

Meiosis is a type of cell division that occurs in sexually reproducing organisms to produce gametes (sperm and egg cells). During meiosis, the number of chromosomes is halved, resulting in the formation of haploid cells. In plants, meiosis is also involved in the production of the female gametophyte, which includes the embryo sac.

Embryo Sac Formation:

The embryo sac is the female gametophyte in angiosperms (flowering plants). It is formed within the ovule, which is located within the ovary of the flower. The embryo sac contains the egg cell, synergids, antipodal cells, and central cell with two polar nuclei. The process of embryo sac formation involves meiosis and subsequent mitotic divisions.

Meiosis Division and Embryo Sac Production:

To determine the number of meiosis divisions required to produce 100 embryo sacs, we need to understand the process of embryo sac formation and the number of divisions involved.

- Each meiosis division results in the formation of four haploid cells, known as spores.
- In plants, the spores produced by meiosis are called megaspores.
- One of the megaspores undergoes further mitotic divisions to form the embryo sac.

Calculating the Number of Meiosis Divisions:

To produce 100 embryo sacs, we need to calculate the number of meiosis divisions required based on the number of embryo sacs produced from one meiosis division.

- One meiosis division produces one megaspore.
- One megaspore undergoes further mitotic divisions to form one embryo sac.
- Therefore, one meiosis division results in the formation of one embryo sac.

Answer:
Based on the above calculations, the correct answer is (3) 50.

Explanation:
To produce 100 embryo sacs, we need 100 meiosis divisions. This is because each meiosis division results in the formation of one embryo sac. Therefore, to produce 100 embryo sacs, we would require 100 meiosis divisions.

In Summary:
- Meiosis is involved in the production of gametes and the female gametophyte in plants.
- The embryo sac is the female gametophyte in angiosperms.
- Meiosis divisions produce megaspores, which undergo further mitotic divisions to form the embryo sac.
- To produce 100 embryo sacs, we would require 100 meiosis divisions.
- Therefore, the correct answer is (3) 50, as each meiosis division produces one embryo sac.