Embryo sac is to ovule as ……is to an anther(a)Stamen(b)Filament(c)Pollen grain(d)Androecium

Answer: c. Pollen grain
In plant reproduction, the relationship between the embryo sac and the ovule is that the embryo sac is contained within the ovule, and it plays a key role in fertilization. Similarly, in the male reproductive organ of a flower, the structure that plays a similar role to the embryo sac is the pollen grain, which is found in the anther.
1. Embryo sac and Ovule:
o The embryo sac is the female gametophyte found within the ovule. It is responsible for the production of egg cells for fertilization.
2. Pollen grain and Anther:
o The pollen grain contains the male gametophyte (sperm cells) and is produced in the anther, which is part of the stamen (the male reproductive organ).
o The pollen grain, when transferred to the stigma of the female reproductive part (pistil), participates in fertilization.
3. Why not other options?:
o a. Stamen: The stamen is the male reproductive organ as a whole, consisting of the anther and filament. It is not directly analogous to the embryo sac.
o b. Filament: The filament is a part of the stamen that supports the anther; it is not analogous to the embryo sac.
o d. Androecium: The androecium is the entire male reproductive structure, which includes all the stamens. It is not a direct analogy to the embryo sac.
Thus, the correct answer is c. Pollen grain, as it is to the anther what the embryo sac is to the ovule.