EXERCISE 12 



STRUCTURE OF A MONOCOTYLEDONOUS STEM 

 Materials. Stems of corn ; pieces of palm stem. 



Directions for work. Not all stems are like those studied. 

 The stems studied in the preceding exercise belong to the 

 dicotyledonous group ; the corn and palm are representative 

 of the monocotyledons. (See illustrations and discussions in 

 " Practical Botany," pp. 335-350.) 



Examine the cross section of a corn stem, noting the distri- 

 bution of the fibrovascular bundles. Also cut the stem length- 

 wise and trace some of the bundles. 



By the use of colored water follow the path of the water 

 through the stem, as in Exercise 6. 



Compare the corn stem with the palm. Make a diagram 

 showing how the bundles are arranged. 



References 



BERGEN and CALDWELL. Practical Botany, pp. 53, 54, 335-350. 

 BERGEN and CALDWELL. Introduction to Botany, p. 68. 



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