Which of the following organisms is correctly paired with a trophic level?
a. cyanobacterium—secondary consumer
b. grasshopper—primary consumer
c. zooplankton—primary producer
d. grass—decomposer
Which of the following organisms is correctly paired with a trophic level?
a. cyanobacterium—secondary consumer
b. grasshopper—primary consumer
c. zooplankton—primary producer
d. grass—decomposer
Which of these ecosystems has the lowest net primary production per square meter? a. a salt marsh b. an open ocean c. a coral reef d. a tropical rain forest
The discipline that applies ecological principles to returning degraded ecosystems to a more natural state is known as a. restoration ecology. b. thermodynamics. c. eutrophication. d. biogeochemistry.
Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem? a. the rate of decomposition in the ecosystem b. the production efficiency of the ecosystem's consumers c. the trophic efficiency of the ecosystem d. the location of the nutrient reservoirs in the ecosystem
Which of the following was a result of the Hubbard Brook watershed deforestation experiment? (A) Most minerals were not recycled within the intact forest ecosystem. (B) Calcium levels remained high in the soil of deforested areas. (C) Deforestation decreased water runoff. (D) The nitrate concentration in waters draining the deforested area became dangerously high.
Which of the following would be considered an example of bioremediation? a. adding nitrogen-fixing microorganisms to a degraded ecosystem to increase nitrogen availability b. using a bulldozer to regrade a strip mine c. reconfiguring the channel of a river d. adding seeds of a chromium-accumulating plant to soil contaminated by chromium