Question

Choose the correct statement(s).
Statement 1: In a mature embryo sac, egg apparatus is situated towards the chalazal end.
Statement 2: In a mature embryo sac, antipodal cells are situated towards the micropylar end.
Statement 3: An angiosperm embryo sac is 7-celled 8-nucleate at maturity.

• A. Statement 2 only.
• B. Statements 1, 2 and 3.
• C. Statement 1 only.
• D. Statement 3 only.

Answer 1

The correct option is D Statement 3 only.

The embryo sac is an oval multicellular haploid structure, surrounded by the nucellus towards the micropylar half of the ovule.

It undergoes one meiotic and three successive mitotic division to become 8-nuclei but 7-celled structure containing 3 cells at the micropylar end, 3 cells at chalazal and one central cell.

Collectively synergids bearing the filiform apparatus and the egg cell present at the micropylar end are called egg apparatus.

Cells situated at the chalazal end are called antipodal cells and is typical and most common among flowering plants.