Question

why andrecium and gynecium mature at different time in a same flower​

Answer 1

Androecium and gynoecium of the same flower maturing at different times is a contrivance for cross pollination

This is done so that the pollen grains cannot come in contact with the stigma of the same flower and hence prevent self pollination

If androecium matures first it is protoyandry and if the gynoecium matures first it is protogyny

Hope this helps you ☺️

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