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Topic: Double fertilization, endosperm and embryo development· Reproduction

In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are :

1. Synergids, antipodals and Polar nuclei

2. Synergids, Primary endosperm nucleus and zygote

3. Antipodals, synergids, and primary endosperm nucleus

4. Synergids, Zygote and Primary endosperm nucleus

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Answer: 4. Synergids, Zygote and Primary endosperm nucleus

Key idea: In a fertilised embryo sac, count ploidy for each structure.

  • Synergids: haploid (n).
  • Zygote: diploid (2n), formed by syngamy.
  • Primary endosperm nucleus: triploid (3n), formed by triple fusion.

So the order haploid, diploid, triploid is synergids, zygote, PEN. Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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