Name: 
 

Balance in the Ecosystem - Practice Exercise 6-1 - Accommodation and Adaptation


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

 1. 
How many species are there identified and estimated on the Earth today? 
a.
5 million:25 million
b.
1.5 million:5 million  
c.
1 million:10 million 
d.
3 million:8 million 
 

 2. 
Cell for cell, planktonic algae fix more solar energy and manufacture more protoplasm than plants on the land.
a.
True
b.
False
 

 3. 
What percentage of the world's species is contained in tropical rain forests? 
a.
25% 
b.
50%
c.
82% 
d.
37% 
 

 4. 
Tropical rain forests occupy what percentage of Earth's land area? 
a.
10% 
b.
7% 
c.
18% 
d.
25% 
 

 5. 
What percentage of the total net primary productivity of the terrestrial nvironment is used or wasted in some way by humans? 
a.
70% 
b.
30% 
c.
40% 
d.
60%
 



 
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