What is ploidy of egg and polar nuclei (both of which are within the embryo sac) in angiosperms?

Dear Student,

Polar nuclei are the two haploid nuclei in the embryo sac. These nuclei fuse with a pollen nucleus to form a triploid endosperm nucleus that subsequently divides to form the endosperm.

Ploidy of Polar nuclei is Diploid (2n). In other words, 

  • Polar nucleus is either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus, which combines with a male nucleus to form the endosperm.

Ploidy of egg cell is Haploid (n), with this the nuclei from the sperm cell fuses to form a zygote. 

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