Name: 
 

Balance in the Ecosystem - Practice Exercise 6-4 - Water, Carbon and Nitrogen Cycle


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
The biological or living components of the biosphere. 
a.
Biosphere 
b.
Abiotic 
c.
Biotic 
d.
Atmosphere
 

 2. 
Complementary process of photosynthesis, and cellular respiration. 
a.
Hydrologic cycle 
b.
Carbon cycle
c.
Phosphorus cycle 
d.
Nitrogen cycle 
 

 3. 
A group of individuals of the same species occupying a given area at the same time. 
a.
Populations 
b.
Community 
c.
Ecosystem 
d.
Chemosynthesis
 

 4. 
The movement of water through the environment, from the atmosphere to Earth and back. 
a.
Carbon cycle 
b.
Nitrogen cycle
c.
Phosphorus cycle 
d.
Hydrologic cycle 
 

 5. 
Soil bacteria that reduce nitrates or nitrites to gaseous nitrogen and some nitrous oxide. 
a.
Chlorophyll
b.
Albedo 
c.
Anaerobic bacteria 
d.
Denitrifying bacteria 
 



 
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