The largest gametophyte is found in .........

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(B) In the plant kingdom,the size of the gametophyte shows a trend of reduction as evolution progresses.Bryophytes like $Polytrichum$ (a moss) have a

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Polytrichum

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(B) In the plant kingdom,the size of the gametophyte shows a trend of reduction as evolution progresses.Bryophytes like $Polytrichum$ (a moss) have a dominant,independent,and photosynthetic gametophyte.Pteridophytes like $Nephrolepis$ have a small,independent,and multicellular gametophyte called a prothallus.Gymnosperms like $Cycas$ have a highly reduced gametophyte that is dependent on the sporophyte.Angiosperms have the most reduced gametophyte (pollen grain and embryo sac).Therefore,among the given options,$Polytrichum$ (a bryophyte) possesses the largest and most complex gametophyte.

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