How many cells are located at the chalazal end of the embryo sac?

The correct answer is Option (3) →Three

Explanation:

• In a mature embryo sac (female gametophyte) of an angiosperm, there are seven cells and eight nuclei.
• The chalazal end of the embryo sac contains three antipodal cells, which are non-functional and eventually degenerate.

Cellular arrangement in the embryo sac:

1. Micropylar end → Egg apparatus (3 cells)
• One egg cell
• Two synergids (assist in pollen tube guidance)
2. Central cell → Contains two polar nuclei, which fuse with a sperm cell to form endosperm (3n).
3. Chalazal end → Three antipodal cells

Other options:

One – Incorrect, because there are three antipodal cells at the chalazal end.

Two – Incorrect, because the chalazal end has three cells, not two.

Four – Incorrect, because only three cells