Why do androecium and gynoecium of same flower matures in different time?

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Solution

Some plants have only androecium and some have only gynoecium. But in some plants both gynoecium and androecium are present. Those flowers are called hermaphroditic flowers or bisexual flowers.
In hermaphroditic flowers as a mechanism of preventing the self-pollination androecium and gynoecium of the same flower matures in different time. This phenomenon is called dichogamy.

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