66 



THE PLANT 



2. Forage Crops, grown for hay, fodder, or pasture, and includ- 

 ing clovers and grasses. 



3. Root Crops and those in which the root of a biennial plant 

 becomes a storehouse of nourishment. Typical roots of this kind 

 are turnips, beets, carrots, horseradish, etc. 



4. Tuber Crops, the outgrowth of creeping subterranean stems 

 growing beneath the surface of the soil or partly covered by it. 



Turnip. 



Jerusalem artichoke. 



The best examples are seen in the potato, the Jerusalem artichoke, 

 and the sweet potato. 



5. Fiber Crops, including cotton, hemp, jute, ramie, Manila fiber, 

 sisal, maguey, etc. Wool and silk are animal fibers and are 

 discussed in Chapter XXI. 



6. Miscellaneous Crops include those not described in the other 

 classes. 



EXERCISES 



1. Let the students bring in plants and point out the vegetative organs. 



2. Arrange to have one plant left with its roots exposed and note what 

 takes place. 



3. Place one plant in a glass or jar of water so that the roots will be 

 covered and note how long the plant will live. 



4. Invert one plant and immerse its leaves in water, but leave the 

 roots exposed, and note the results. 



5. Remove the roots entirely from one plant and place the stem in 

 water. Note how much time elapses before the plant begins to wilt. 



6. Compare the roots of the oat plant with those of the corn plant and 

 note the chief differences. 



7. If possible, bring in examples of each one of the leading classes or kinds 

 of crops. 



8. Make a list of all the crops grown in your county. 



