In angiosperm, the haploid, diploid and triploid structures of the fertilised embryo sac sequentially are

In angiosperm, the haploid, diploid, and triploid structures of the fertilised embryo sac, sequentially, are synergids, zygote and primary endosperm nucleus. The two sperm cells from the pollen tube enter the embryo sac in the angiosperm. One of the sperm cells fuses with the egg cell and forms a diploid zygote. The other sperm cell fuses with the two polar nuclei to form a triploid primary endosperm nucleus. The synergids, along with the egg cell, are located at the micropylar end of the embryo sac and are haploid.
(1) Synergids, antipodals and polar nuclei are all haploid structures.
(2) Synergids are haploid, primary endosperm nucleus is triploid, and zygote is a diploid structure.
(3) Antipodals and synergids are haploid structures and primary endosperm nucleus is a triploid structure.