EXERCISE 108 

 ROOT TUBERCLES 



Materials. Roots of clover, alfalfa, or other legumes. The roots 

 should be dug carefully in order that the tubercles may not be 

 broken off in freeing the roots from the soil. 



Directions for work. The tubercles are small rounded or 

 oval bodies in connection with the smaller roots. They are 

 easily seen. 



After noting their abundance, form, size, and color, break one 

 of them open and examine them microscopically for bacteria. 



Examine roots of a number of members of the pea family 

 (Legttminosce) that may be found, to discover how common is 

 the possession of tubercles. 



References 



BERGEN and CALDWELL. Practical Botany, pp. 374-378. 

 BERGEN and CALDWELL. Introduction to Botany, pp. 204-206. 



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