Question

The embryo sac has ___ egg cell, ___ synergids, ___ antipodal cells and ___ polar cells.

• A. 2,1,3,2
• B. 1,3,2,2
• C. 1,3,2,1
• D. 1,2,3,2

Answer 1

The correct option is D 1,2,3,2

The mature embryo sac contains 7 cells ( 3 antipodal cells, 2 synergid cells, 1 egg cell and 1 central cell) and 8 nuclei ( 3 of antipodal cell, 2 of synergid cells, 1 of egg cell and 2 of central cell).

One nucleus is located in the egg cell near the opening of embryo sac. Two nuclei are located in two synergid cells which flank the egg cell. The synergids and egg cell together constitute the egg apparatus. Two nuclei are located in a single cell called central cell present in the middle of the embryo sac and are called polar nuclei. The other three nuclei reside in the cells called antipodals which are located at the end of embryo sac, opposite to egg cell.

Thus, embryo sac has one egg cell, two synergids, three antipodal cells and two polar nuclei.