In some plants, pollen release and stigma receptivity are not synchronized. Stigma becomes receptive much before the release of pollen. This is known as:

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Different timing of maturation of stamen and carpel of a bisexual flower is called dichogamy. If stamen matures first, it is called protoandry; if carpel matures first, it is called protogyny. Homogamy is the same timing of maturation of stamen and carpel.

Botany - Sexual Reproduction in Flowering Plants Question with Solution | TestHub

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