Quiz_1.3 Feedback

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Quiz_1.3 Feedback

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5. Which is an example of negative feedback? *

1 point

A. Loss of vegetation leading to soil erosion leading to further loss of vegetation.

B. A decline in a large predator population after they have eaten most of their prey population.

C. Melting of permafrost in the tundra due to climatic change leading to further release of methane, causing further change.

D. Unsustainable slash and burn agriculture practices in tropical rain forests.

8. Which of the following contributes most effectively to self-regulation within a system? *

1 point

A. Rapid transfer of materials

B. Inputs of energy being greater than outputs

C. Negative feedback mechanisms

D. Positive feedback mechanisms

19. A stable ecosystem will be in . . . (I) . . . equilibrium, achieved largely through mechanisms of . . . (II) . . . feedback. *

Complete this statement.

1 point

A. Steady state / Positive

B. Static / Negative

C. Steady state / Negative

D. Static / Positive

24. The capacity of a system to self-regulate is generally increased by *

1 point

A. the presence of positive feedback.

B. the presence of negative feedback.

C. low energy inputs in the system.

D. energy outputs greater than energy inputs in the system.

30. The accelerating decline in the population of a country in which the average age was increasing, provides an example of which of the following? *

1 point

A. Negative feedback

B. Positive feedback

C. Steady-state equilibrium

D. A demographic transition model

32. Which of the following is an essential feature of a system in steady-state equilibrium? *

1 point

A. Positive feedback mechanisms

B. Negative feedback mechanisms

C. Balanced inputs and outputs

D. High diversity

41. As disease spreads through a population, numbers fall. As the result of a reduction in contact between individuals, the rate of spread of the disease is reduced. This is followed by a recovery in numbers. *

This is an example of

1 point

A. positive feedback

B. negative feedback

C. demographic transition

D. entropy

47. When a population exceeds the carrying capacity of the environment that supports it, which process often restores the equilibrium? *

1 point

A. Succession

B. Negative feedback

C. Exponential growth

D. Positive feedback

49. As a result of global warming, there could be increased *

__I. snowfall at the poles.______II. melting of polar ice caps.______III. photosynthesis. Which could produce positive feedback in the Earth’s climate system?

1 point

A. I, II and III

B. I and III only

C. II only

D. III only

57. Which of the following best describes the result of positive feedback in a system? *

1 point

A. The system changing further in the same direction

B. The system remaining stable

C. The system changing in the opposite direction

D. The system remaining unchanged

63. Which of the following is an example of negative feedback? *

1 point

A. Loss of vegetation, leading to soil erosion, leading to further loss of vegetation

B. Animals failing to reproduce when food is abundant

C. More carbon dioxide favouring plant growth, so plants absorb more carbon dioxide

D. A population of small mammals in a forest decreasing due to a fire

74. Which of the statements about negative feedback is correct? *

1 point

A. Negative feedback amplifies or increases change in a system.

B. Negative feedback consumes energy from a system.

C. Negative feedback is undesirable for the environment.

D. Negative feedback counteracts deviation from equilibrium in a system.

81. Which is an example of negative feedback? *

1 point

A. An increase in air temperature increases the rate of melting of the Earth’s ice caps, thus decreasing the reflection of solar radiation.

B. An increase in a herbivore population, leading to overgrazing and thus to a decline in the herbivore population.

C. An increase in human birth rate compared with death rate leading to exponential increase in the human population.

D. A loss of vegetation leads to soil erosion and thus further loss of vegetation occurs.

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