HOW DO WE USE FOODS? 313 



organic sugars moon's stars' 



destroying gases minerals fats 



proteins germ soil fluid 



Foods which come from living things are called (1) foods, 



while water and mineral salts are examples of (2) foods. 



(3) plants are said to provide food for the world because in 



the long run the (4) energy, acting on the (5) coloring 



matter in leaves, causes (6) or (7) to be made there from 



certain raw materials found in (8) and (9) Foods are 



classified by the chemist as (10) , fats and oils, (11) , 



water, (12) , and (13) The nutrition expert classifies our 



foods as (14) foods, (15) building foods, and (16) or 



regulative foods. 



STORY TEST 



JULIA FINDS THE STUDY OF FOODS EASY 

 Read carefully and critically. List all the errors and suggest corrections. 



I have found this problem on foods and their sources interesting 

 and easy. Many of the facts we know already, for example : 

 Those foods we get from the ground as salt, potatoes, and carrots 

 are mineral foods ; those from plants as corn, apples, and wheat 

 are plant foods; and those from animals as eggs, lamb, and beef 

 are animal foods. Milk and vegetables which have an abundance 

 of mineral salt in them are inorganic foods. The fruits, as oranges, 

 bananas, berries, corn, potato, and wheat, are the most-used part 

 of a plant. However, the roots of plants are very important 

 plant foods, among these are the beet, potato, turnip, onion, and 

 peanut. 



Plants make food out of the raw materials they take up from 

 the earth through the roots. The water from the soil brings 

 carbon dioxide and mineral salts up to the leaves, where sunlight 

 causes chemical changes which result in plant foods. One of 

 these plant foods is sugar, and the test for it is iodine. If food has 

 a drop of iodine solution placed on it and it turns blue, there is 

 sugar in it. The important classes of foods are sugar, fats, proteins, 

 mineral matter, and vitamins. 



PROBLEM II. HOW DO WE USE FOODS? 



People Live on Foods from Their Own Environment. It 



is interesting to see that through the ages, long before 

 people knew anything about the chemical composition of 



