Question

List the components of embryo sac and mention their fate after fertilization.

Answer 1

1. Mature embryo sac is 7-celled and 8 nucleate.
2. Egg apparatus with two synergids and an egg cell at the micropylar end.
3. Two polar nuclei constitute the secondary nucleus of the central cell.
4. At the chalazal end, there are three antipodal cells.
5. The pollen tube feeds the synergids. Synergids direct the growth of the pollen tube towards the egg.
6. Syngamy occurs when a male gamete combines with a female gamete to generate a zygote, which grows into an embryo.
7. One male gamete combines with a secondary nucleus to form the main endosperm nucleus (PEN), which produces endosperm, the embryo's nutritional component.