Which of the following best describes the net primary productivity of an ecosystem?
2. Open Ended
30 seconds
1 pt
If respiration by the aquatic producers is 12,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year?
3. Open Ended
30 seconds
1 pt
Of the following organisms, which occupies the lowest trophic level?
4. Open Ended
30 seconds
1 pt
Losses of usable energy between successive trophic levels in an ecosystem are best accounted for by which of the following?
5. Open Ended
30 seconds
1 pt
Which of the following is exemplified by the equations above?
6. Open Ended
30 seconds
1 pt
The explanation for the variation includes which of the following?
i. Temperature
ii. Precipitation
iii. Longitude
7. Open Ended
30 seconds
1 pt
Which of the following best describes the first law of thermodynamics?
8. Open Ended
30 seconds
1 pt
Which of the following is the most likely amount of energy available to secondary consumers?
9. Open Ended
30 seconds
1 pt
An energy transformation occurs and results in increased disorder.
10. Open Ended
30 seconds
1 pt
Which of the following categories of organisms, which are required for the cycling of matter in an ecosystem, is missing from the table?
11. Open Ended
30 seconds
1 pt
which of the following changes would most likely occur in the food web of this ecosystem?
12. Open Ended
30 seconds
1 pt
Based on the data in the table, which of the following pairs of organisms has two ecological relationships, both competition and predation?
13. Open Ended
30 seconds
1 pt
Which of the following best describes the movement of energy in an ecosystem?
14. Open Ended
30 seconds
1 pt
Which of the following values best represents the amount of energy available for primary consumers in the food chain?
15. Open Ended
30 seconds
1 pt
Which of the following values best represents the amount of energy available for secondary consumers in the food chain?
16. Open Ended
30 seconds
1 pt
For a primary producer, the main function of photosynthesis is to manufacture
17. Open Ended
30 seconds
1 pt
Which of the following best describes gross primary productivity in an ecosystem?
18. Open Ended
30 seconds
1 pt
Which of the following best explains why terrestrial trophic pyramids usually do not have levels higher than tertiary consumers?
19. Open Ended
30 seconds
1 pt
Which of the following best explains why decomposers in soils and water are important to ecosystems?
20. Open Ended
30 seconds
1 pt
The maximum efficiency possible in an energy-conversion process that is not limited by the second law of thermodynamics
21. Open Ended
30 seconds
1 pt
The ultimate source of energy for terrestrial ecosystem is
22. Open Ended
30 seconds
1 pt
Which of the following statements is best supported by the data?
23. Open Ended
30 seconds
1 pt
Which of the following best identifies the author's claim?
24. Open Ended
30 seconds
1 pt
All of the following are negative externalities EXCEPT
25. Open Ended
30 seconds
1 pt
Which tree species grows best with full sunlight?
26. Open Ended
30 seconds
1 pt
Which of the following would be categorized as a cultural ecosystem service of forests?
27. Open Ended
30 seconds
1 pt
Which of the following would most likely result from the deforestation of large areas of tropical rain forests caused by slash-and-burn agriculture?
28. Open Ended
30 seconds
1 pt
Based on the theory of island biogeography, which of the following is the most likely reason that an island in the ocean that is 5 kilometers from a continent would have a higher number of species than one that is 15 kilometers from a continent?
29. Open Ended
30 seconds
1 pt
On the basis of the data, the best prediction of the pH of the water in which Daphnia normally are found in the wild is
30. Open Ended
30 seconds
1 pt
Based on the theory of island biogeography, which of the following would most likely experience the greatest decline of specialist species if an invasive species emigrated from the mainland?
31. Open Ended
30 seconds
1 pt
Which of the following correctly describes the disruption of an ecosystem service by an anthropogenic activity?
32. Open Ended
30 seconds
1 pt
Five islands, A, B, C, D, and E, differ only in distance from the mainland, area, and species diversity. Which island would be predicted to have the highest species diversity?