EXERCISES IN ELEMENTARY BIOLOGY 



EXERCISE 1 



Our world is made up of things that are constantly changing. Both living and non-living things 

 change from day to day, from season to season. 



Problem. What. are some of the changes occurring in the world about us? 



What to use and what to do. Using the following blanks, in each column describe five changes (in 

 addition to the example printed) that happen to the kind of things named at the head of the column. 



Questions to think about. 1. What kinds of changes in the world do you find most interesting? 

 2. What kinds of changes in the world would you consider most important ? 



NOTE. In some of the changes (for example, melting ice or dissolving sugar) the matter takes on new appearances or 

 qualities, but the substance remains the same. Such a change is called a. physical change. In other changes, certain of the 

 substances in the object seem to disappear entirely and new materials to make their appearance, as in a flame or in frying 

 eggs. Changes of this kind are chemical changes. 



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