Solution: The two strategies involved in preventing self-pollination in flowers are:

Dichogamy – It refers to the production of male and female reproductive organs at different times. Occurs with the help of a hermaphroditic organism in order to prevent self-fertilization.

Self-incompatibility – It is a genetically controlled mechanism. Here , pollen grains are unable to completely grow on the stigma of the same flower and that leads to the inability to produce zygotes after self-pollination.