EXERCISE 42 



PROPAGATION BY ROOTS 

 Materials. Roots of horse-radish. 



Directions for work. Cut off the upper ends of the roots, thus 

 removing all stem tissues and buds. Cut the roots into pieces 

 of various sizes. Plant the pieces in soil or sand and keep 

 moist. When signs of growth are seen, dig up the roots and 

 examine them. 



Are buds and shoots formed freely by the roots ? Are small 

 pieces of roots able to form shoots ? What would be the result 

 of breaking up the roots of a horse-radish plant in the soil, as 

 by plowing ? Does this assist in explaining why horse-radish is 

 such a persistent weed ? 



References 



BERGEX and CALDWELL. Practical Botany, p. 33. 

 BERGEN and CALDWELL. Introduction to Botany, p. 32. 



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