Q15 · Practice questionComplex familiar1 mark
QUESTION 15
Two protist species use the same limiting food source. When cultured together, their populations follow the graph. Which conclusion is best supported?
(A)
Species A competitively excludes species B under these conditions.
(B)
Species B is a predator of species A.
(C)
Both species occupy completely different niches.
(D)
Species A converts individuals of species B into its own species.
WORKED SOLUTION
1 markAnswer A
Answer
A
Working
A persists while B declines towards zero. With a shared limiting resource and no predation stated, the pattern supports competitive exclusion by A under the experimental conditions.
Marking criteria
- Select A. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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