2.2 Ecosystems - Productivity 1

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2.2 Ecosystems - Productivity 1

Name: *

For question 2 and 3, use the diagram below showing energy transfer in a cow.

2. Net Secondary Productivity (NSP) is *

1 point

C + R.

C - (R + U + F).

C - (U + F).

C + R + U + F.

3. If C = 4 000 kJ/day and NSP = 200 kJ/day, the efficiency of conversion is *

1 point

50%.

10%.

5%.

2%.

9. Net Primary Production is the amount of energy *

1 point

produced from ‘alternative’ sources in developing countries.

fixed in an ecosystem by photosynthesis.

fixed in an ecosystem by photosynthesis, minus the losses due to respiration by producer organisms.

fixed by the herbivores in an ecosystem.

13. If the rates of photosynthesis and respiration (in a plant) were exactly equal, which of the following would be true? *

1 point

Net Productivity would equal respiration

Net Productivity is at a maximum

Net Productivity would equal Gross Productivity

Net Productivity would be zero

16. The following are processes occurring in mineral cycles: I. conversion of carbon dioxide to organic matter____II. conversion of phosphates to organic matter____III. convection of water vapour____IV. conversion of nitrites to nitrates *

Which of the above processes does not depend directly on input of solar energy?

1 point

I, II and IV only

II only

III only

IV only

For questions 28 and 29, use the diagram below (all values are in kJ m^–2 yr^−1).

28. The values of W, X, Y and Z are *

1 point

72 000__8400____720____92

8000___8400____720____92

8000___7600____80 _____92

8000___7600____80 _____68

29. The carnivores’ productivity as a percentage of primary productivity is *

1 point

0.003.

0.03.

0.3

For questions 32 to 33, use the following data collected in a study of secondary productivity in a population of woodlice. Some of the woodlice produced offspring during the experiment.

32. Gross productivity of this population over the period of the experiment was *

1 point

2.55 g.

2.22 g.

1.71 g.

1.02 g.

32A. Estimated loss due to respiration of this population over the period of the experiment was *

1 point

2.55 g.

2.22 g.

1.71 g.

1.02 g.

33. Net productivity of this population over the period of the experiment was *

1 point

0.06 g.

0.63 g.

0.69 g.

1.02 g.

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