what is double fertilisation in angiosperms explain with diagram

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Solution

Pollen tube enter the embryo sac of ovule with two male gametes. One male gamete fuses with egg cell to form a zygote and other fuses with the diploid secondary nucleus (formed by the fusion of two polar nuclei) as a result triploid primary endosperm nucleus (PEN) is formed. As there is two types of fusion takes place inside ovule of angiosperm so this is called as double fertilization.

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