why are pteridophytes said to exhibit heteromorphic alternation of generations

Dear Student,

Alternation of generation in pteridophytes

Pteridophytes also show heteromorphic alternation of generation like bryophytes but the dominant phase is sporophyte.

Haploid generation called gametophyte undergoes sexual reproduction to produce gametes. Production of gametes involve mitosis, so the gametes are also haploid. The gametes fuse to form a diploid zygote which grows into the next generation, the diploid sporophyte generation (2n). Zygote( diploid oospore) develops into embryo which produces well-differentiated, multicellular sporophyte.  Sporophyte  is well-differentiated into  true stem, leaves, and roots.  Sporophyte produces spores all which can be of similar type or of two types. Spores germinate to form small, multicellular, non-vascular free-living photosynthetic thalloid haploid gametophyte called prothallus.



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