[skribanto]

Aren’t fruits only plants which contain seeds? Like a celery would not be a fruit

[dnlzro]

Mostly. There are some “seedless” fruits (bananas, grapes, etc) which have been bred to be defective, or have become defective because of some natural mutation. [1]

There’s also fruits like coconuts, which don’t have seeds like we normally think of them. The coconut we eat after removing outer layers (exocarp, mesocarp) is a seed.

[1] https://en.wikipedia.org/wiki/Parthenocarpy