EXERCISE 27 



There are many different chemical processes going on in plants and animals. Oxidation is not the 

 only one, but it seems to be nearly universal, and it makes available to living matter the energy for its. 

 various activities. 



Problem. Is heat energy released when seeds sprout? 



What to use. Three containers ; large seeds, some soaked, some dry ; three thermometers. 



What to do. Hang up thermometers and note whether they agree as to temperature recorded. Filf 

 three bottles, one with dry seeds, one with soaked seeds, one with seeds that have been soaked in 

 water to which a few drops of formalin have been added. 



Record. Note the reading of the thermometers at twenty-four-hour intervals. 



Conclusions. What is there in the results that enables us to answer the question in the Problem ? 



Questions. 1. Under what conditions do the seeds change the temperature most ? 



2. What is the effect of the formalin in this experiment ? 



3. How can you tell whether changes in temperature during sprouting are related to oxidation ? 



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