Question

describe three device by which cross pollination is encouraged in angiosperms by avoiding self pollination​

Answer 1

Answer:

Three outbreeding devices that flowering plants have developed: Receptivity of stigma and release of the pollen grain is not synchronized, i.e., stigma becomes receptive much before pollens are released or after they are released to avoid self-pollination.

Hope you got your answer.

Answer 2

Answer:

self incompatibility; uni sexuality; dichogamy; protandry/prtogyny;