A-Level UK (AQA, Edexcel, OCR) · Biology

Ecology

8 practice questions, each with the answer and an explanation.

Practise Ecology now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

  1. A sample contains three species with 6, 3 and 1 individuals. Calculate Simpson's index of diversity, D = 1 - sum of (n/N) squared.
  2. A producer fixes 12 000 kJ m-2 year-1 and the primary consumers receive 1100 kJ m-2 year-1. What percentage of energy is transferred?
  3. Gross primary production is 8200 kJ m-2 year-1 and plant respiration loses 3100 kJ m-2 year-1. What is net primary production?
  4. What is the term for the first species to colonise bare rock?
  5. In a mark-release-recapture study, 40 snails are marked and released. A second sample of 50 contains 8 marked snails. Estimate the population.
  6. Which bacteria convert ammonium ions to nitrite and then nitrate in the soil?
  7. Which sequence correctly describes eutrophication of a lake?
  8. Which factor is density-dependent?

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