Question

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

• A. Antipodal, synergid and primary endosperm nucleus
• B. Synergid, zygote and primary endosperm nucleus
• C. Synergid, polar nuclei and zygote.
• D. Synergid, antipodal and polar nuclei

Answer 1

The correct option is B Synergid, zygote and primary endosperm nucleus

Embryo sac

A typical female gametophyte is formed by the mitotic division of the haploid functional megaspore. It therefore contains seven cells and eight nuclei that are haploid in nature.

Double fertilisation

During double fertilisation the following events take place:-

* The egg fuses with male gamete to form diploid zygote.

* One synergid cell degrades and the other directs the entry of pollen.

*Central polar nuclei fuse with another male gamete to form a triploid primary endosperm nucleus.

*Antipodal cells are degraded after fertilisation.

So in a fertilised embryo sac the following are present:-

*Haploid-synergid,

* Diploid-zygote
*Triploid -primary endosperm nucleus



Final answer: Synergid, zygote and primary endosperm nucleus