In angiosperms, the fusion of a male gamete with the secondary nucleus is considered as "second fertilization" because

  • A
    it is the fusion of two nuclei.
  • B
    the secondary nucleus is a sister nucleus of the egg.
  • C
    it takes place in the embryo sac.
  • D
    it involves the fusion of a male gamete with two polar nuclei (or the secondary nucleus formed by their fusion) to form the primary endosperm nucleus $(PEN)$.

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