Question

The adult plant body in Bryophytes is a haploid gametophyte while in PTeridophyte it is a diploid sporophyte . Why???

Answer 1

In bryophytes the adult plant is a haploid gametophyte just because it is well differentiated into roots ,stems and leaves which is a dominant phase.
in pteridophyte the diploid sporophyte which is a short lived parasite which depends on gametophyte for nutrition and it is also well differentiated into roots ,stems and leaves which is a dominant phase in pteridophyte's cycle.