The process in which pollen fertilizes the egg is known as fertilization.
Plant reproduction is merely identical (in simple terms) to human reproduction. Just like the testes (or testis, if you will), the pollen carries sperm and places it into the female's reproductive system.
If you need a more thorough explanation, I highly recommend Hank Green's video on plant reproduction.
Here's the link:
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lol idk man i guess u gotta ask bill nye the science guy