Question

Polygonum type of embryo sac is?

• A. $8$-nucleate, $7$-celled
• B. $8$nucleate, $8$-celled
• C. $7$-nucleate, $7$-celled
• D. $4$-nucleate, $3$-celled

Answer 1

The correct option is A $8$-nucleate, $7$-celled

A typical angiosperm embryo sac, at maturity, though 8-nucleate is 7-celled. At the time of fertilization, the female gametophyte has 3 antipodal cells + 2 synergids + 1 egg cell + 1 central cell, which equals 7-celled structure. But the central cell has 2 polar nuclei, which makes it 8-nucleate. Therefore, at maturity, the gametophyte is 7-celled and 8-nucleated.

So, the correct option is '8-nucleate, 7-celled'.