Name and explain two stages of mosses

Dear student,

In mosses, alternation of generation occurs, it means means that two types of organism, a haploid gametophytic generation and a diploid sporophytic generation, alternate in the life cycle.
The haploid generation is called the gametophyte because it 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. It is called sporophyte because it undergoes asexual reproduction to produce spores. Production of spores involves meiosis, so that there is return to the haploid condition. The haploid spores give rise to the gametophytic generation. 


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