rge bottle. The bf soil, a few green aquatic plants and a fish were placed in a

Question

rge bottle. The bf soil, a few green aquatic plants and a fish were placed in a following organisms in the bottle produce carbon dioxide? wing organisms in theed in a window to receive light during the daytime. Which of A) Aquatie plants B) Fish 27. Some water, a small amount of soil, a tew g large bottle. The bottle was placed to receive C) Soil microbes D) All of the above E) A&Conly; The presence of one species (A) in a community may benefit another species (B) if: A) a mutualistic relationship (mutualism) exists between the two. 28. B) the first species (A) preys upon a predator of the second species (B) C) the first species (A) preys on a species that competes with the second species (B). D) the second species (B) preys upon the first species (A) E) All of the above. Which of the following is TRUE about secondary consumers in an ecosystem? A) They primarily eat animals. B) They are eaten by primary consumers. C) They are smaller and weaker than are primary consumers. D) They are greater in number than are primary consumers. E) They contain the greatest total biomass in the system. 29. 30. The introduction of a large predatory fish into a lake will lead to declines in the populations of smaller fish; this decrease in the smaller fish will lead to an increase in the plankton on which they feed. This phenomenon is called A) rescue effect. B) competitive exclusion C) trophic cascade. D) primary succession E) island biogeography

Explanation / Answer

27. Answer : A) Aquatic plants.

28. Answer : A) the mutualistic relationship exixts between two.

29. Answer : D) they are greater in number than are primary consumers.

30. Answer : C) tropic cascade

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