In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are :
Synergids, Primary endosperm nucleus and zygote
Antipodals, synergids, and primary endosperm nucleus
Synergids, Zygote and Primary endosperm nucleus
Synergids, antipodals and Polar nuclei
In an angiosperm embryo sac, synergids are haploid (n), the zygote is diploid (2n) formed by the fusion of male gamete and egg, and the primary endosperm nucleus (PEN) is triploid (3n) formed by the fusion of two polar nuclei and one male gamete.
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