A mature, embryo-sac in a flowering plant may possess 7-cells, but 8-nuclei. Explain with the help of a diagram only.

Explanation

In an embryo-sac, three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus end and constitute the egg apparatus. The egg apparatus is consist of two synergids and one egg cell. The synergids have cellular thickenings at the micropylar tip called filiform apparatus, which plyas an important role in guiding the pollen tubes into the synergids. Three cells are at the chalazal end and are called antipodals. Thus, a typical angiosperm embryo-sac at maturity, though 8-nucleate is 7 celled.