TRILLIUM 189 



K. Development of the Embryo: 



i. After fertilization (7, 2, (c), p. 184), the oosperm 

 develops the embryo-sporophyte, and while this 

 is in progress the endosperm-nucleus, by successive 

 divisions, develops into endosperm which surrounds 

 the embryo, and will serve to nourish it when it 

 re-awakens, at the "germination" of the seed. 



L. Fruit and Seed: 



1. Meanwhile, as a result of fertilization, the ovary 

 resumes growth, and develops into a fruit (ripened 

 ovary), while the ovule enlarges and undergoes 

 numerous changes, ripening into a seed. 



2. In a concisely worded paragraph, tell what a seed 

 is, stating to which of the alternating generations 

 the seed-coats, endosperm, and embryo belong. 



M . Nutrition: 



i. Discuss the nutrition of both the gametophyte 

 and sporophyte of Trillium, as suggested above 

 (L, 1-4, p. 1 60) for Zamia. 

 N. Tabular Review: 



Fill in the tables below (pp. 190 and 191), by placing 

 an x in the proper space, then state, in a well- 

 worded paragraph for each table, what may be 

 learned by an inspection of it. 



