Grade. 

 Date. . 



EXERCISE 5 



CREEPING AND UNDERGROUND PARTS 



Object. To know the types of creeping and underground parts of plants. 



1. Parts of a Root. Obtain corn and bean seedlings which were grown 



for the previous exercise. Note that the primary root of the bean is strongly 



developed and secondary roots branch from it. The primary root of corn is 



FIG. 5. A fibrous-root as shown by a grass 

 plant. (Cook's Applied Economic Botany.) 



FIG. 6. A fleshy root as shown by a car- 

 rot. (Cook's Applied Economic Botany.) 



succeeded by others which do not arise as branches upon the primary one 

 but spring from the stem a certain distance below the ground. The roots of 

 common grasses and cereals form in this way. Note the fine root hairs which 

 form just back of the root tips. Through these the plant obtains food from 

 the soil. 



2. Types of Creeping and Underground Parts of Plants. Draw an 

 example of each type to scale so that all five drawings may occupy one page. 

 Do not draw the potato tuber since this will be done in a later exercise. 



A. Fibrous Root. Examples: Timothy, wheat, oats, barley (Fig. 5). 



B. Tap Root. Examples: Alfalfa, red clover. 



C. Fleshy Root. Examples: Carrot, turnip, beet (Fig. 6). 



D. Stolon. Examples: Strawberry, orange hawkweed. 



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