Question

Synergids are -
A. Haploid
B. Diploid
C. Triploid
D. Tetraploid

Answer 1

Hint:
These cells are considered essential in assuring flourishing fertilization. The synergid cells direct pollen tube growth to the female gametophyte. It makes possible the access of the tube into the embryo sac.

Complete answer:
In over 80 % of the angiosperms, the female gametophyte is including seven cells, two of which are the synergid cells. Once the pollen tube enters the synergid cell, its expansion is arrested, the tip of the tube disintegrates, and two sperm cells are released.
Also, dismissal of the cells of the male germ unit, the direction of the two sperm cells in the degenerating synergid, and fusion of the egg and central cell with sperm cells may also be linked to synergid cells.
After megasporogenesis, out of these four megaspores, three disintegrate and one remains purposeful. The competent megaspore then undergoes mitosis to form 2 daughter nuclei which further undergo two more mitotic divisions resulting in 8 nuclei, 3 of which get structured into egg apparatus comprising of an egg cell and two synergids at the micropylar end, other 3 nuclei get organized into antipodal cells at the chalazal end and the rest 2 nuclei from the central cell.
As these 8 nuclei are derived from the mitotic divisions of the haploid megaspore, these are haploid and thus, the synergids are haploid cells.

Hence, Option (A) is the correct answer.

Note:
Megasporogenesis refers to the development of megaspores from the megasporocyte. For this, the cell that undergoes meiosis. Meiosis of the megasporocyte nucleus results in the arrangement of four haploid megaspore nuclei. In most taxa, meiosis is followed by cytokinesis, which leads to the formation of four megaspore cells.