Answer :

Synergids, antipodal, polar nuclei are haploid in nature.


Zygote is diploid cell.


Primary endosperm nucleus is triploid in nature.


Antipodal are haploid in nature


So in a fertilised embryo sac, the haploid, diploid and triploid structures are Synergid, zygote and primary endosperm nucleus respectively.


Therefore the correct answer is option (a).

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