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(D) Double fertilization is a complex fertilization mechanism in angiosperms. It involves the fusion of one male gamete with the egg cell to form a di

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Angiosperms

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(D) Double fertilization is a complex fertilization mechanism in angiosperms. It involves the fusion of one male gamete with the egg cell to form a diploid zygote (syngamy). The second male gamete fuses with the two polar nuclei (or secondary nucleus) to form a triploid primary endosperm nucleus $(PEN)$,a process known as triple fusion. Since these two processes occur in the same embryo sac,the phenomenon is collectively called double fertilization,which is unique to angiosperms.

Double fertilization and triple fusion are characteristic features of . . . . . . .

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