Question

The pollen grain is related to the embryo sac as
(a) Male gametophyte is to the egg
(b) Male gametophyte is to the female gametophyte
(c) Sperm is to the egg
(d) Sperm is to the female gametophyte

Answer 1

Pollen grains are a powdery substance that is the male gametophyte of seed plants and have a hard court made up of sporopollenin which protects them during their movement.

Complete answer:
The pollen grain is related to the embryo sac as the male gametophyte is to the female gametophyte. The formation of the embryo sac is known as mega gametogenesis which is the process of maturation of the female gametophyte in plants and during which the megaspore arises from megasporogenesis which gets developed into the embryo sac where the female gamete is fused. The developing embryo undergoes meiosis during the process of megasporogenesis which involves certain steps that is the remaining megaspore undergoes around mitosis which results in the structure with the two nuclei known as binucleate embryo sac and each nucleus migrate to opposite sides of the embryo sac.
The haploid nucleus undergoes two rounds of mitosis which creates four haploid nuclei on each end of the embryo sac. The nucleus from each set of the embryo sac migrates to the centre and forms the binucleate endosperm mother cell which leaves three remaining nuclei on the micropylar end. The cell plates form around the entire portal nuclei egg cell and the synergid cells. The Pollen grain cannot be seen with the naked eyes and need magnification for better vision and are used for transferring haploid male genetic material from the anther of a flower to the stigma of another flower during the process of cross-pollination and during self-pollination, they take it from the anther of a flower to the stigma of the same flower.

So, the correct answer is 'Male gametophyte is to the female gametophyte'.

Note:
Pollen grains are of many colours and some of them cause allergies which is the hypersensitivity to the Pollen. Plants use some tricks to spread pollen and the plant pollinators can be large or small.