(B) In pteridophytes,the main plant body is a sporophyte $(2n)$.These sporophytes bear sporangia in which spore mother cells $(2n)$ are present.Reduct

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(B) In pteridophytes,the main plant body is a sporophyte $(2n)$.These sporophytes bear sporangia in which spore mother cells $(2n)$ are present.Reduction division (meiosis) occurs in these spore mother cells to produce haploid $(n)$ spores.Therefore,the correct answer is spore mother cell.