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it is the process at the time of fertilization when two male gametes are brought to the oval sac one of them fuses with egg cell to form embryo and the other gamete fuses with the cells in the center that are called polar nuclei to form endosperm further to provide nourishment to the growing embryo.
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In the seed one male gamete fuses the egg cell and the other one fuses with the secondary nucleus.this is called double fertilization.It helps in the proper development of seed.
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