As the zoologist Luis Villazon notes, plant seeds are reliably protected by a shell and have enough food inside for a future plant so that even after a while the seed can germinate. Moreover, some plant species have large seeds, while others have small ones. What is the reason for this?
So, the coconut has the largest seeds that are able to germinate even after four months at sea. Dandelions have much smaller seeds. This is explained by the fact that such seeds easily find a suitable piece of land. But orchids have the smallest seeds, since the probability of finding the right place on a tree branch is very small and it is required to produce several million seeds at a time.