(A) Antipodals - Haploid: Correct. The antipodal cells, along with the egg apparatus (egg cell and synergids), are part of the mature embryo sac (female gametophyte) which is haploid (n) in angiosperms.
(B) Zygote - Diploid: Correct. The zygote is formed by the fusion of haploid male and female gametes (n + n = 2n), making it diploid.
(C) Synergids - Diploid: Incorrect (Mismatch). Synergids are part of the egg apparatus in the embryo sac and are haploid (n) like all other cells of the female gametophyte.
(D) Primary Endosperm Nucleus (PEN) - Triploid: Correct. The PEN is formed by the fusion of one haploid male gamete (n) with two haploid polar nuclei (n + n), resulting in a triploid (3n) nucleus in most angiosperms.
Thus, the mismatch is (C) Synergids - Diploid, as synergids are actually haploid cells.
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Synergids are haploid cells that flank the egg cell in the embryo sac, all derived from the same meiotic division. The antipodals (A) are indeed haploid, the zygote (B) forms diploid through syngamy, and the Primary Endosperm Nucleus (D) is correctly triploid from double fertilization.
