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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