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Q.
Which one is pioneer in gametophyte generation of bryophytes?
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Solution:
Haploid spore $(n)$ is considered pioneer in gametophytic generation of bryophytes. These haploid pioneer structure of gametophytic generation are formed from spore mother cell by meiosis which in turn are produced within sporangium. Protonema is the gametophytic structure developed from germination of spore and perichaetium is the name given to the leaves surrounding the archegonia.