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QUESTION 6 The ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers is a(n): A. trophic pyramid B. dominance hierarchy C. ecosystem D. food web E. food chain QUESTION 7 Food webs are more stable than food chains. True False QUESTION 8 A keystone species is one that affects community structure in a disproportionate amount in relation to its abundance. True False QUESTION 9 In the absence of a keystone predator on the rocky intertidal, Robert Paine found that ____________ were competitively dominant to all other sessile organisms. A. barnacles B. sea urchins C. mussels D. seastars E. kelp QUESTION 10 Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Elephants can be defined as what type of species in this community? A. redundant B. dominant C. keystone D. dominant and keystone E. none of the above

          QUESTION 6
The ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers is a(n):
A. trophic pyramid
B. dominance hierarchy
C. ecosystem
D. food web
E. food chain

QUESTION 7
Food webs are more stable than food chains.
True
False

QUESTION 8
A keystone species is one that affects community structure in a disproportionate amount in relation to its abundance.
True
False

QUESTION 9
In the absence of a keystone predator on the rocky intertidal, Robert Paine found that ____________ were competitively dominant to all other sessile organisms.
A. barnacles
B. sea urchins
C. mussels
D. seastars
E. kelp

QUESTION 10
Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Elephants can be defined as what type of species in this community?
A. redundant
B. dominant
C. keystone
D. dominant and keystone
E. none of the above

Added by Matthew M.

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