Question
View answerSLPaper 1A
Marked beetles were released at R. The map shows the recapture. Which change best reduces bias in the Lincoln estimate?
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Question
SLPaper 1A
To obtain 20 non-empty quadrats, a student rejects quadrats without daisies. Which evaluation is supported?
| Field | Mean daisies per accepted quadrat | Empty quadrats rejected |
|---|---|---|
| X | 18 | 2 |
| Y | 14 |
SLPaper 1A
A bacterium and fungus co-occur less than expected (χ² p=0.02). Which combination supports antibiotic-mediated competition at 5% significance?
SLPaper 1A
Culture P received water, mineral ions and CO₂ but no organic carbon. Which conclusion is supported?
HLPaper 2
Figure 1 shows how the numbers of a predator and its prey in a community changed over several years. Both populations oscillate, but their peaks do not coincide.
Figure 1: Out-of-phase oscillations of a predator and its prey
IB Biology Topic C4.1 Populations and Communities Questionbank
Practice IB Biology Topic C4.1 Populations and Communities with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for C4.1 Populations and Communities and mirrors Paper 1A, 1B, 2 style where relevant.
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