TESTS 35 



II. Matter (61 is anything that has weight; (7) is easily destroyed : 

 (8) is material in the form of gas, liquid, or solid ; (9) can be changed 

 from one form to another: (10) is organic or inorganic. 



III. Energy (11) can be either gaseous or liquid ; (12) is power to do 

 work : (13.) may be released by oxidation ; (14) is potential or kinetic : 

 (15 ) is stored in the foods we eat. 



IV. Foods (16) contain waste material; (17) are all obtained in 

 their final state from the soil ; (18) contain nutrients ; (19) are used 

 by plants and animals to release energy and to build and repair tis- 

 sue; (20) are made by green plants. 



V. Man (21) can control his environment : (22) needs green plants 

 to make food; (23) is not able to oxidize food to release energy; 



24 is composed of the same chemical elements as his environment; 

 (25 is the only living thing that can change his environment. 



Achievement Test 



1. How can you make oxygen? 



2. How do you test for carbon dioxide ? 



3. What chemical and physical happenings take place when you 

 burn a match? 



■1. What are the chemist's symbols for oxygen, nitrogen, carbon. 

 hydrogen, and carbon dioxide? 



5. What is meant by the term " conservation of energy '"? How 

 could you perform a demonstration to prove it ? 



6. How can you distinguish between the natural and artificial 

 factors of your environment ? 



Practical Problems 



1. List the ways in which a tree and man use their environments. 

 List the natural and artificial factors of your environment. 



2. Take some factor of the environment in your community that 

 you think is poor and make definite suggestions for its improvement. 



3. Show some example of conservation of energy taken from your 

 own home environment; from the country in which you live. 



L'sefct References 



Downing. Our Living World, pp. 309-350. (Longmans, Green. & Co.. 

 New York. 1924.) 



Hunter, G. W.. and Whitman. W. G.. Problems in General Science. 

 14 Control of Environment.''' pp. 15-34. (American Book Company.) 



Pack, Trees as Good Citizens, pp. 17-26. (American Tree Associa- 

 tion, Washington, D.C., 1922.) 



