Question

What are the cells present in a developed embryo sac of angiosperms?

Answer 1

In developed embryo sac there are 7 cells,which are formed after 2,4,8 nucleate stages leading to formation of the typical female gametophyte or embryo sac.

• three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus in turns constits of 2 synergids and one egg cell.
• three cells are at the chalazal end and are called the antipodal.
• the remaining 2 cells called polar nuclei located at the centre. The two cells fuse to form a large central cell .

thus a typical angiosperm embryo sac,at maturity,though 8-nucleate is 7-celled.

Answer 2

Developed embryo sac  of angiosperms

Explanation:

• In developed embryo sac there are 7 cells,which are formed after 2,4,8 nucleate stages leading to formation of the typical female gametophyte or embryo sac.

• Three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus in turns constits of 2 synergids and one egg cell.
• The remaining 2 cells called polar nuclei located at the centre. The two cells fuse to form a large central cell .
• Thus a typical angiosperm embryo sac,at maturity,though 8-nucleate is 7-celled