2.1 Individuals, populations, communities and ecosystems Quiz
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5 questions, one answer each
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1. Which describes a community?
- A. Organisms of one species in one place
- B. All the interacting populations in an ecosystem
- C. The place where a species lives
- D. The conditions a species needs
2. A student marks 50 snails, later catches 40 of which 10 are marked. The Lincoln index estimate is:
- A. 200
- B. 125
- C. 20
- D. 80
3. Which is a density-dependent factor?
- A. A volcanic eruption
- B. Competition for food
- C. A flood
- D. A frost
4. Which method suits estimating the population of a non-mobile plant?
- A. Capture–mark–release–recapture
- B. Random quadrat sampling
- C. Lincoln index
- D. Tracking by radio
5. What describes a keystone species?
- A. The most abundant species
- B. A species with a disproportionate effect on its ecosystem
- C. A species at the top of every food chain
- D. An introduced species