One nucleus of pollen tube and secondary nucleus of embryo grow into-----
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During double fertilization two sperm are introduced into the embryo sac from the long pollen tube. One sperm nucleus fuses with the egg nucleus inside the egg cell to form a diploid (2n) zygote which develops into the embryo of the seed.
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Explanation:
During double fertilization two sperm are introduced into the embryo sac from the long pollen tube. One sperm nucleus fuses with the egg nucleus inside the egg cell to form a diploid (2n) zygote which develops into the embryo of the seed.
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