In a fertilised embryo sac, the haploid, diploid and triploid structure are:
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(i) Synergid—haploid
(ii) Polar nuclei-haploid
(iii) Antipodal-haploid
(iv) Zygote-diploid
Since, all these cells three (synergid, polar nuclei and antipodals are) form by mitosis from the functional megaspore, they are haploid ( n ).
Egg cell fertilises with the male gamete to form a diploid zygote.
(v) Primary Endosperm Nucleus (PEN),-triploid. Diploid secondary nucleus fertilises with a haploid male gamete to form a triploid PEN.
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