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Sexual Reproduction In Flowering Plants

Question
CBSEENBI12001242

What do you understand by double fertilization ?

Solution
In angiosperms both the male gametes are functional. Double fertilization is a process in which egg nucleus and secondary nucleus are fertilized at one time by the male gametic nuclei. The fusion of one male gamete nucleus (1n) with egg or oosphere (1n) is called syngamy and result in the formation of oospore (2n). The second male gamete fuses with the two polar nucleii  and is called triple fusion which results in formation of primary endosperm nucleus (3n).  Since there are two fertilization events it is called double fertilization.