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  • In a fertilised embryo sac, the haploid, diploid and triploid structures are:a. Synergid, zygote and primary endosperm nucleus b. Synergid, antipodal and polar nuclei

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

a. Synergid, zygote, and primary endosperm nucleus

b. Synergid, antipodal and polar nuclei

c. Antipodal, synergid, and primary endosperm nucleus

d. Synergid, polar nuclei and zygote.

Answers (1)

The answer is option (a) Synergid, zygote, and primary endosperm nucleus

The embryo sac is a haploid structure that contains seven cells and eight haploid nuclei. 

  • Haploid (n): The synergids are haploid cells that assist in guiding the pollen tube to the egg cell but disintegrate following fertilization.
  • Diploid (2n): The zygote is formed by the fusion of the haploid egg cell (n) with one haploid sperm cell (n), resulting in a diploid structure.
  • Triploid (3n): The primary endosperm nucleus arises when one sperm cell (n) fuses with the two polar nuclei (each n) in the central cell, creating a triploid structure.

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