(B) $Dichogamy$ is a mechanism that promotes cross-pollination by ensuring that the anther and the stigma of the same flower mature at different times

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Anther and stigma mature at different times

(B) $Dichogamy$ is a mechanism that promotes cross-pollination by ensuring that the anther and the stigma of the same flower mature at different times. This prevents self-pollination. It is of two types: $Protandry$ (anthers mature first) and $Protogyny$ (stigma matures first). An example is the sunflower.