EXERCISE 24 



From a previous experiment (Exercise 23) we learned that air is one of the factors necessary for 

 germination. We might well ask ourselves the same questions concerning sprouting of seeds as we 

 did concerning the flame. Reviewing the make-up of air, consider the following : 



Problem. What part (or parts) of the air is related to sprouting ? 



What to use. Bottles of no air, if an exhaust pump is available ; of oxygen ; of nitrogen ; of carbon 

 dioxid ; soaked seeds (peas, beans, or maize) ; air. 



What to do. Place equal numbers of seeds in bottles containing the above gases. Have one bottle 

 containing air as a control, or check. 



Record. Make careful observation of results twenty-four hours apart. 



Conclusions. From, the results what can you tell about the relation of nitrogen, oxygen, etc. to 

 sprouting ? 



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