EXERCISE 123 (Continued) 



Record. Make enlarged drawings to show the following structures : 



1. Gametophyte as a whole, stalk, "roots," "leaves." 



2. Longitudinal section of rosette showing archegonia. 



3. Longitudinal section showing antheridia. 



4. Sporophyte growing out of gametophyte, general view. 



5. Enlarged view of spore capsule, with hood and lid separated. 



6. Longitudinal section of spore capsule. 



7. Microscopic view of spores. 



NOTE 4. In the mosses, a sporophyte always develops from a fertilized egg, and a gametophyte always develops 

 from a spore. 



Questions. 1. What are the most striking structural differences between the sporophyte and the 

 gametophyte in the moss ? 



2. Which generation is the better food producer ? Why ? 



3. Which generation contributes more to a wide distribution of the species ? How ? 



4. What conditions must be necessary for fertilization ? 



5. In what sense is the gametophyte dependent upon the sporophyte ? 



6. In what sense is the sporophyte dependent upon the gametophyte ? 



7. Which generation could more readily live an independent life if it were once started on its 

 way ? Why ? 



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