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4.1 Ecosystems

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Question 5

In ecosystems, food chains rarely contain more than four or five trophic levels. Which of the following best explains this limitation?

A

Herbivores are much more efficient at digesting food than carnivores.

B

Approximately 90%90\%90% of energy is lost at each trophic level transition, leaving insufficient energy to support higher levels.

C

The physical size of organisms always decreases at higher trophic levels.

D

The total number of organisms increases at each successive trophic level.

Markscheme

4.1 Ecosystems Questions

  1. GCSE
  2. /Biology
  3. /4.1 Ecosystems

67 exam-style questions on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one has a worked solution and a mark scheme showing where the marks go.

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