l6o MORPHOLOGY AND LIFE HISTORY 



L. Nutrition: 



1. Describe the relative ability of the mature sporo- 

 phyte and the gametophyte to lead an independent 

 existence. Is the gametophyte ever independent 

 of the sporophyte? Does the sporophyte ever live 

 parasitically on the gametophyte? 



2. Why does the embryo-sporophyte need a supply of 

 food stored in the seed? 



3. Would it be of any special advantage to Zamia to 

 have a well-developed male gametophyte? Why? 



4. At home write a detailed description of the changes 

 undergone by a starch grain, formed in the leaf of 

 a mature carpellate sporophyte, until it becomes 

 part of the tissue of the embryo-sporophyte of the 

 next sporophyte-generation. 



5. Make a diagrammatic outline (using words, not 

 drawings) showing the life cycle of Zamia from 

 sporophyte to sporophyte. 



