self-pollinate

Second, the reproductive parts of the wheat plant are close together, so wheat tends to self-pollinate.

第二，小麦植株的生殖器官距离很近，小麦是单株繁殖的。

Many plants self-pollinate, but most orchids need help to reproduce.

许多植物自传花粉，但绝大多数兰花需要外界的帮助。