Topic 4 Clickers + Additional Question

Question 1

39. Which of the following is an example of a microbial habitat?
    a) The human git
    b) Soil
    c) Lake sediments
    d) Ocean water
    e) The oceanic crust
    f) Rock 2 km below the ground

Answer 1

a) The human git
b) Soil
c) Lake sediments
d) Ocean water
e) The oceanic crust
f) Rock 2 km below the ground

Question 2

40. What does it mean for terrestrial habitats to rely on plant life as dominant primary
    producers?
    a) Plants produce oxygen, which is needed for other forms of life.
    b) Plants are the dominant carbon-fixing organisms.
    c) Plants are a food source for all other living things.
    d) Plants perform photosynthesis

Answer 2

b) Plants are the dominant carbon-fixing organisms

Question 3

41. Why do terrestrial habitats support more chemoorganoheterotrophs than aquatic
    and subsurface environments?
    a) There is more oxygen available in terrestrial habitats.
    b) Plants produce abundant organic carbon.
    c) Chemoorganoheterotrophs require dry environments.
    d) Random chance and evolution.

Answer 3

b) Plants produce abundant organic carbon.

Question 4

42. Which of the following are components of soil?
    a) Plants
    b) Weathered rock
    c) Decomposing leaf litter
    d) Bedrock
    e) The air right above the surface of the Earth

Answer 4

b) Weathered rock
c) Decomposing leaf litter

Question 5

43. Fungi are important as decomposers because they are the only group of
    microorganisms capable of breaking down…
    a) Cellulose
    b) Chlorophyll a
    c) Lignin
    d) Chitin

Answer 5

c) Lignin

Question 6

44. The rhizosphere contains more microorganisms than bulk soil because of the
    availability of…
    a) Moisture
    b) Energy
    c) Heat
    d) Carbon
    e) Nitrogen

Answer 6

d) Carbon

Question 7

45. Sulfate reduction commonly occurs in lakes. Sulfate-reducing bacteria are obligate
    anaerobes. Where in a lake would we expect to find sulfate reducers?
    a) Oxic epilimnion
    b) Anoxic hypolimnion
    c) The sediments
    d) Anywhere suGiciently warm
    e) Anywhere where there is light

Answer 7

b) Anoxic hypolimnion
c) The sediments

Question 8

46. Which river would you expect to have a higher oxygen concentration?
    a) One that is barely flowing.
    b) One that is flowing moderately.
    c) One that is fast flowing and turbulent

Answer 8

c) One that is fast flowing and turbulent