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why are all bryophytes characterised by haplo-diplontic life cycle ?

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All bryophytes are characterised by haplo-diplontic life cycle because both gametophyte and sporophyte are free-living and multicellular, but have different dominant phases. The haploid gametophyte is dominant, independent and photosynthetic. It alternates with short-lived multicellular sporophyte totally or partially dependent on gametophyte for nutrition and anchorage.


Haplodiplontic Life Cycle

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Bryophytes show gametophytic stage and later they show sporophytic stage. But bryophytes mainly show gametophytic stage that is why they are haplo-diplontic.
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In haplodiplontic type of life cycle, both haploid and diploid phases are multicellular and often free living. Bryophytes and pteridophytes exhibit this type of life cycle.

In bryophytes, the dominant photosynthetic thalloid plant body represents the haploid gametophytic phase, and it alternates with short lives multicellular sporophyte totally or partially dependent on the gametophyte for its anchorage and nutrition.
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