Q14 · Practice questionSimple familiar1 mark
QUESTION 14
An orchid uses a tree branch for support. It gains better access to light, while measurements show no detectable effect on the tree. The interaction described is
(A)
competition
(B)
parasitism
(C)
commensalism
(D)
mutualism
WORKED SOLUTION
1 markAnswer C
Answer
C
Working
The orchid benefits and the tree is unaffected under the stated conditions, matching commensalism. Mutualism would require a benefit to both organisms.
Marking criteria
- Select C. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus