What structure emerges from the pollen grain to allow male gametes to travel to the ovule?

The structure that emerges from the pollen grain allowing male gametes to travel to the ovule is the pollen tube. When pollen lands on a compatible stigma, it germinates and forms the pollen tube, which grows down through the style towards the ovule in the ovary of the flower. This tube serves as a conduit for the sperm cells carried within the pollen to reach the egg cell located in the ovule.

The seed is the product of fertilization and doesn't facilitate the transport of gametes. Helium is unrelated to the reproductive process in plants, as it is a gaseous element typically not involved in biological functions. Fruit develops after fertilization and encases the seeds, but it does not play a role in the transport of male gametes to the ovule. The formation of the pollen tube is crucial for successful fertilization in flowering plants, making it the correct answer.