Answer :

The two strategies evolved to prevent self-pollination in flowers are –


• Dichogamy – Maturation of anther and stigma of a flower at different times to prevent self-pollination.


When anther matures before stigma, it is called protandry.


When stigma matures before anther, it is called protogyny.


• Self-incompatibility – In some flowers, self-sterile genes are present due to which the pollen grains do not germinate on the stigma of that flower. E.g. potato, tobacco.


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