Question

During the development of the embryo sac, which stage immediately precedes the formation of the polar nuclei by migration?

Options

• Free nuclear stage

• 4-nucleate stage

• 2-nucleate stage

• 8-nucleate stage

Answer 1

The polar nuclei are formed after the 8-nucleate stage is established. At this stage, with four nuclei positioned at each pole, one nucleus from each pole migrates towards the centre of the embryo sac. These two centrally positioned nuclei become the polar nuclei that will eventually fuse in the central cell.