EXERCISE 51 



From the result of the preceding exercises, compare the process of starch-making in a leaf (or other 

 jreen plant part) with the manufacturing process of a factory. 



FACTORS IN A MANUFACTURING PROCESS 



CORRESPONDING FACTORS IN STARCH-MAKING 



Machines or tools 



Energy for driving machines 



Raw material 



Finished product 



Waste or by-product 



Questions. 1. There is always water and carbon dioxid in the air; why is not carbohydrate con- 

 stantly being formed in the sunlight ? 



2. What becomes of the starch that has been made by a leaf in the course of the day ? 



3. How do water plants obtain their needed material for starch-making ? 



4. How many hours out of the twenty-four could a plant work at food-making ? 



[56] 



