REPRODUCTION AND DEVELOPMENT OF PLANTS 279 



part next to the seed-leaves becomes the stem. Upon care- 

 fully separating the two -seed-leaves, there is found a 

 pair of small thin leaves, with a bud between them, 

 attached to a very short stem, which is joined to the stem 

 part of the rod-like body. (LABORATORY MANUAL, Exercise 

 XXX.) 



317. Process of Germination. To see what becomes of 

 the parts of the embryo, let us plant a bean seed. If the seed 

 is put in a warm, moist place, where there is air, it will soak 

 up water and 

 swell, and pres- 



ently the embryo 

 or baby plant in- 

 side, which has 

 been dormant while the seed was 

 dry, will continue its growth, 

 c 



_a 



FIG. 146. THE BEAN 

 EMBRYO 



1. What are the names of 

 the parts a? What will grow 

 from d? 2. How do you know 

 that c will grow to be a stem? 

 3. What becomes of the two large 

 parts of the embryo? 



C 



FIG. 147. SEED PODS 



The bean pod represents a 

 lengthwise section of an ovary; 

 the triangular figure represents a 

 cross-section of the ovary of a 

 lily. In both cases,' a represents 

 the wall of the ovary; b represents 

 an ovule. 1 . Where are the ovules 

 attached in the bean pod? Where 

 are they attached in the lily pod? 

 2. How many divisions are there 

 in the lily pod? How many in 

 the bean pod? 



This " awakening" and growth into an independent plant is 

 called germination, and the seed is said to germinate. 



