EXERCISE 39. WEED DISSEMINATION 



Equipment: Notebook and pencil. 



Method: Study at least ten different kinds of weeds 

 and determine how they scatter their seeds. Record the 

 results in the following table : 



Discussion: Some seeds are provided with wings, or 

 feathery tufts, which make them easily carried long dis- 

 tances by the wind; others have hooks which cause them 

 to become attached to the clothing or to cattle and be 



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