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

The correct option is A:

Explanation for the correct answer :

1. A typical angiosperm embryo sac, at maturity, though $8-$ nucleate is $7-$celled.
2. 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.
3. The central cell has polar nuclei, making$2$ polar nuclei, which makes it $8-$ nucleate.
4. Therefore, at maturity, the gametophyte is $7-$celled and $8-$ nucleated.

Final Answer :

As a result, the correct answer is '$8-$nucleate, $7-$celled'.