Question

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

Options

• Antipodals, synergids, and primary endosperm nucleus

• Synergids, Zygote and Primary endosperm nucleus

• Synergids, antipodals and Polar nuclei

• Synergids, Primary endosperm nucleus and zygote

Answer 1

In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are synergids, zygote and primary endosperm nucleus.

Explanation:

• The embryo sac, also known as the female gametophyte, is formed after the megaspore's haploid nucleus divides. It consists of two haploid nuclei and six haploid cells that lack cell walls.
• Synergids are haploid entities seen in an embryonic sac. They are specialised cells that exist alongside egg cells in the female gametophyte. A zygote has a diploid structure. It is generated by the fusing of an egg cell with a male gamete, making it diploid.
• The primary endosperm nucleus is generated by the fusing of two polar nuclei of the central cell with a haploid nucleus from one of the male gametes in the embryonic sac. Thus, it possesses a triploid structure.