A YEAR IN SCIENCE 



93 



corresponding parts in the bean. Draw a longitudinal 

 section of the corn, showing and labeling the coty- 

 ledon, plumule, radicle, and endosperm. 



C. Castor bean. 



Compare the parts of the castor bean with those of 

 the lima bean and corn. 



Exercise 63. Seed Dispersal. 



Object: To see how seeds are adapted for the pur- 

 pose of distribution. 



Apparatus 



The available seeds and fruits of your locality 



Directions: Seeds are scattered in various ways by 

 wind, water, animals, and by some contrivance for 

 forcibly expelling the seeds. Examine the seeds and 

 fruits supplied you, and classify each according to its 

 means of distribution as follows : 



Exercise 64. Conditions for Germination. 



Object: To determine the best conditions of tem- 

 perature, moisture, and air supply for the germination 

 of seeds. 



