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NEET 2026 (Phase 1) · BiologyPrevious Year Question

Which one of the following is a triploid cell?

  1. A.(1) Synergid
  2. B.(2) Central cell
  3. C.(3) Zygote
  4. D.(4) Primary endosperm cell✓

Correct Answer

(D) (4) Primary endosperm cell

Solution & Explanation

Answer: D. During double fertilisation, one male gamete fuses with the egg (syngamy) to give the diploid (2n) zygote, while the second male gamete fuses with the two polar nuclei of the central cell (triple fusion) to give the triploid (3n) primary endosperm nucleus, after which the central cell becomes the triploid primary endosperm cell. The synergid is haploid and the zygote is diploid, so the only triploid cell among the options is the primary endosperm cell. NCERT: Ch 1, p.17, lines 19-25 — "The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN)... The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm..."

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