Why are bananas curved?

Bananas grow in large bunches called hands on a stem that hangs downward from the plant. At first the young fruits point toward the ground, but as they develop they turn and grow upward toward the light, a response called negative geotropism or phototropism. Because the fruit starts growing in one direction and then bends toward another, it ends up with its familiar curve. The plant hormone auxin drives this by making cells on one side grow faster than the other. Wild bananas are full of hard seeds; the soft, seedless Cavendish most people eat is a cultivated variety.