When is the endosperm formed in angiosperms?

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(B) In angiosperms,the endosperm is formed as a result of a process called double fertilization. Specifically,one male gamete fuses with the two polar

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After fertilization

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(B) In angiosperms,the endosperm is formed as a result of a process called double fertilization. Specifically,one male gamete fuses with the two polar nuclei (or the secondary nucleus) to form the Primary Endosperm Nucleus $(PEN)$. This process is known as triple fusion. Since this fusion occurs during the fertilization event,the development of the endosperm typically begins after the fertilization process is initiated.

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