Pls tell me the function of polar nuclei in embryo sac ? I need it urgently.

The polar nuclei are the two nuclei situated at the central position of the embryo sac. They together fuse with the male nucleus other than the one who fuses the egg. After fusion the polar nuclei form endosperm which acts as the food supply unit for the seeds in dormancy. 

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it is the result of the mitotic division of the megasporemother cell(3 mitotic division) hence 2 of them form the polar nuclei and fuse with the male gamete to form the pen (primary endosperm nuclei) then the primary endosperm cell is formed  and leading to the formation of the endosperm which serves food for the growing seed 

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