Question

An embryo sac has eight nuclei : at the chalazal end are the three ______, in the middle are the two ______ and at the micropylar end are the two ______ and the one ______.

Answer 1

An embryo sac has eight nuclei : at the chalazal end are the three antipodals, in the middle are the two polar nuclei and at the micropylar end are the two synergids and the one egg.

Explanation:

The mature embryo sac (female gametophyte) of angiosperms typically contains eight nuclei arranged in a specific manner. The three antipodal nuclei are located at the chalazal end, two polar nuclei lie in the center, and at the micropylar end, there are two synergids flanking one egg cell. This arrangement is characteristic of the Polygonum-type (monosporic 8-nucleate) embryo sac, the most common type in flowering plants.