Double fertilization is observed only in:

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(B) Double fertilization is a unique characteristic feature of angiosperms (flowering plants).It involves two fusion events: $1$. Syngamy: One male ga

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Angiosperms

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(B) Double fertilization is a unique characteristic feature of angiosperms (flowering plants).It involves two fusion events: $1$. Syngamy: One male gamete fuses with the egg cell to form a diploid zygote $(2n)$.$2$. Triple fusion: The second male gamete fuses with the two polar nuclei (or secondary nucleus) to form a triploid primary endosperm nucleus $(3n)$.This process ensures the development of an embryo and the formation of endosperm to provide nourishment.

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