Question

How does diploid secondary nuclus is formed​

Answer 1

Explanation:

The embryo-sac formation is preceded by meiosis. Hence, each of the cells of an embryo-sac is haploid. Each embryo-sac has a three- celled egg apparatus – one egg cell and two synergids, three antipodal cells and two polar nuclei. The polar nuclei eventually fuse to produce a diploid secondary nucleus.

Answer 2

Explanation:

the secondary nucleus is former by the fusion of 2 polar nuclei also called definitive nucleus. one unites with the egg nucleus to form the zygote which develop into the embryo.