C4.1 Populations and communities Quiz
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5 questions, one answer each
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1. In a mark–recapture study, M = 40, N = 50 and R = 10. The estimated population is:
- A. 100
- B. 200
- C. 500
- D. 2000
2. Which is a density-independent factor?
- A. Competition for food
- B. A severe frost
- C. Predation
- D. Spread of disease
3. In the legume–Rhizobium mutualism, the bacteria provide:
- A. sugars
- B. fixed nitrogen
- C. water
- D. protection from herbivores
4. A significant negative association between two species:
- A. proves competition
- B. suggests but does not prove competition
- C. proves mutualism
- D. shows the species are unrelated
5. The plateau of a sigmoid curve is reached at the:
- A. lag phase
- B. carrying capacity
- C. exponential phase
- D. extinction point