Define homogamy and self sterlity with example

Homogamy is a condition where the stigma and anther of a flower mature at the same time. This synchrony increases the likelihood of self-pollination. Self-sterility (or self-incompatibility) is a genetic mechanism where a plant is unable to produce seeds through self-pollination, even if pollination occurs. The pollen may germinate, but it is rejected by the stigma or style, or the pollen tube growth is inhibited. Example: Many plants exhibit homogamy, such as Hibiscus. For self-sterility, Prunus species like cherries and plums often show self-incompatibility, requiring cross-pollination from a different variety to produce fruit.