Q. In a fertilised embryo sac, the haploid, diploid and triploid structures are

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Solution:

Synergids are a pair of haploid cells present at the micropylar end of embryo sac and constitute egg apparatus along with haploid egg. Zygote is a diploid structure formed by fusion of male and female gametes whereas primary endosperm nucleus is triploid, formed by fusion of one male gamete with the secondary nucleus.