SPIROGYRA SP. 115 



esses that take place in the formation of the 

 new plant (mature zygote) from the zygospore. 

 Compare the plant of the new generation with 

 its parents. 



12. Is there a physiological division of labor in this 

 plant? Explain in detail. 



13. Draw a diagram showing the ancestors of a plant 

 of Spirogyra for three generations. 



14. To complete your notes on Spirogyra, write, at 

 home, and before the next laboratory period, as 

 clear and well-worded an account as you can of 

 the life history of the plant. 



15. Arrange ferns, algae, mosses, liverworts, in a 

 vertical column in the order of the complexity of 

 their organization, placing the more highly organ- 

 ized near the top of the column. Write a clear 

 statement of the reasons for your arrangement 

 of the above classes. 



