310 LIVES OF PLANTS AND ANIMALS 



A mountain near a desert may show (8) (9) . Each 



of these (10) has (11) and (12) peculiar 



to itself. 



Review Summary 



Test your knowledge of the unit by : (1) rechecking on all the survey ques- 

 tions ; (2) performing all assigned exercises ; (3) checking with your teacher all 

 tests and doing over the parts you missed ; (4) making an outline of the unit 

 for your notebook. 



Test on Fundamental Concepts 



In a vertical column under the heading CORRECT write numbers of all statements you 

 believe are true. In another column under INCORRECT write numbers of untrue statements. 

 Your grade = number of right answers X 3f . 



I. The balance of life (1) means that living plants and animals are 

 mutually dependent upon each other ; (2) is shown by a poor garden 

 crop in a dry year ; (3) in a certain region is often disturbed by man 

 when he cultivates wild areas ; (4) is shown in a balanced aquarium ; 

 (5) was disturbed in Australia by the introduction of water cress. 



II. The grouping of plants and animals in associations (6) is due 

 to the kind of food available; (7) is called a habitat; (8) differs 

 according to the environment; (9) is seen in a balanced aquarium; 

 (10) is brought about by the ability of certain living things to live 

 together under certain conditions. 



III. Plants and animals may be prevented from living in certain 

 localities by (11) too much light ; (12) lack of certain salts in the soil ; 

 (13) lack of water; (14) too much water; (15) lack of oxygen. 



IV. Symbiosis (16) is the process of living together for mutual 

 advantage ; (17) is a partnership between two living things ; (18) occur 

 when green plants give food to animals and depend upon certain wastes 

 from them in order to make this food ; (19) is a bad thing, because it 

 is a one-sided relationship ; (20) is the same as parasitism. 



V. Ecological succession (21) occurs when changes in environment 

 cause changes in forms of plants and animals living in a given place; 

 (22) is never brought about by man; (23) is often caused by man; 



(24) is often caused by immigrations of animals due to lack of food ; 



(25) results in new forms being found in a given locality. 



VI. Life zones (26) are found on the sides of a high mountain 

 where life forms characteristic of the tropics to the arctic may be found 

 from the base to the summit ; (27) are illustrated by the temperate 

 zone, the torrid zone, etc. ; (28) are usually well marked but show 



