PHYSIOLOGICAL PROCESSES IN PLANTS 61 



d. Food 



(Some results of oxidation of food in both plants and animals.) 



Method. Germinate some seeds in a small, wide-mouthed 

 bottle. After a few days remove some of the gas above the 

 sprouting seeds with a large bulb pipette, and bubble it through 

 liine water. Put a lighted splint in the gas still remaining in 

 the bottle. 



Observations 1. What results when the gas was bubbled 

 through lirnewater ? When the lighted stick was inserted ? 



Conclusions. 1. W T hat gas was evidently present ? Reasons 

 for your decision ? 



2. Where was this gas evidently formed ? Explain. 



3. How have we heretofore learned this gas to be made ? 



4. If oxidation took place in the seeds, what else should 

 result besides giving off carbonic acid gas ? 



5. Insert a thermometer among some germinating seeds, and 

 also among a lot of seeds not germinating, but under similar 

 conditions. Result ? 



6. How do the results obtained here agree with those of your 

 previous study of oxidation ? 



7. Blow through a glass tube into some limewater. Result ? 

 What has evidently been formed in your body ? 



8. What are some of the results of oxidation of food in both 

 plants and animals ? 



9. Explain how you know seeds must breathe. 



References 



Hunter, Essentials of Biology. Chap. VI. 

 Hunter, Elements of Bioloyy. Chap. VI. 



PROBLEM XII 



A study of young plants until they are independent 

 (seedlings}. 



Material. Soaked beans and peas. Sand or sawdust, boxes 

 or pots. 



