Information and IdeasHardFinding supporting a claim about a cause
Information and Ideas practice question
An ecologist claims that the decline of the meadow's orchids is due to the loss of the fungi in the soil that the orchids depend on, rather than to grazing.
Which finding, if true, would most directly support the ecologist's claim?
- A. Orchids have declined equally in fenced plots without grazing and in grazed plots, while soil samples across the meadow show the partner fungi have almost vanished.Correct
- B. Orchids depend on soil fungi.
- C. The meadow is grazed by sheep.
- D. Orchids are declining across the region.
Answer: A. Orchids have declined equally in fenced plots without grazing and in grazed plots, while soil samples across the meadow show the partner fungi have almost vanished.
No difference with or without grazing; the fungi are gone.
Why the other answers are wrong
- B. Orchids depend on soil fungi.
- A general fact, not evidence about this meadow.
- C. The meadow is grazed by sheep.
- The premise, and it cuts the other way.
- D. Orchids are declining across the region.
- Says nothing about the cause.
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