204 MORPHOLOGY AND LIFE HISTORY 



in its two- to eight-celled stages, identifying 

 the cells mentioned in 6 above. Draw. 

 K. Development of the Embryo: 



i. After fertilization (K, 2, (c), p. 199), the oosperm 

 develops the embryo-sporophyte, and while this 

 process is taking place, the endosperm-nucleus, in 

 many cases, fuses with the second sperm-cell (double 

 fertilization). By successive divisions the endo- 

 sperm-nucleus develops into endosperm, which sur- 

 rounds 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. 175) for Zamia. 



N. Tabular Review: 



Fill in the tables below (pp. 205 and 206), by placing 

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

 worded paragraph for each table, what my be 

 learned by an inspection of it. 



