Here's a breakdown:

* Sperm: These are the male gametes, produced by the pollen grains within the anther of a flower.

* Egg cells: These are the female gametes, produced within the ovule located inside the ovary of a flower.

The process of fertilization in plants involves the sperm cell traveling from the pollen grain to the egg cell within the ovule. This fusion of the gametes results in the formation of a zygote, which develops into the embryo of a new plant.

While the term "gamete" generally refers to sperm and egg cells, it's important to note that some plants have more complex reproductive cycles. For instance, in flowering plants, the sperm cells are actually contained within pollen tubes, which grow down the style of the flower towards the ovary.

Let me know if you'd like to dive deeper into specific types of plants or their reproductive processes!