AnswersFL-2001340-Environmental Science BHuman Impact on the Environment

Week 4 Test Answers

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What is the effect of the biogeochemical cycles?

A
cycling energy through a food chain
B
recycling matter through the biosphere
C
recycling rocks through the layers of Earth
D
cycling nutrients through the human body
22
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Thiobacillus denitrificans is a species of bacteria that obtains its energy from carbon dioxide and inorganic compounds such as nitrogen in its environment. It is used in bioremediation (natural cleansing) of groundwater that contains excess nitrate, allowing the nitrates to be removed. Through what process does Thiobacillus denitrificans help bioremediate groundwater?

A
nitrification
B
denitrification
C
nitrogen fixation
D
decomposition
23

Which type of pollution includes CFCs and smog?

A
land
B
air
C
water
D
volcanic
24

The Remora remora, or suckerfish, often attaches to larger organisms such as sharks and whales through the use of a specialized sucker. This interaction enables the remora to feed on the scraps of food that remain from the larger organism’s meal. Typically, the larger organism is unaware of, and unaffected by, the remora. Which type of interaction occurs between the remora and its host organism?

A
mutualism
B
commensalism
C
parasitism
D
competition
25

Actinobacteria sp. are fermenting organisms, which do not require oxygen to survive. These organisms break down organic material and convert it to inorganic material. Which part of the carbon cycle does this describe?

A
photosynthesis
B
respiration
C
decomposition
D
assimilation

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