(A) The embryo sac (female gametophyte) contains seven cells and eight nuclei. Two of these nuclei,known as polar nuclei,are situated in the central c

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(A) The embryo sac (female gametophyte) contains seven cells and eight nuclei. Two of these nuclei,known as polar nuclei,are situated in the central cell. During double fertilization,these polar nuclei fuse with one of the male gametes to form the primary endosperm nucleus $(PEN)$ through a process called triple fusion.