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4.1 Ecosystems

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Question 18

The diagram shows the energy trapped as biomass at each stage of a food chain:

phytoplankton (25 000 kJ)⟶zooplankton (2 500 kJ)⟶small fish (375 kJ)⟶large fish (45 kJ) \text{phytoplankton (25 000 kJ)} \longrightarrow \text{zooplankton (2 500 kJ)} \longrightarrow \text{small fish (375 kJ)} \longrightarrow \text{large fish (45 kJ)} phytoplankton (25 000 kJ)⟶zooplankton (2 500 kJ)⟶small fish (375 kJ)⟶large fish (45 kJ)

What is the percentage efficiency in the transfer of energy between the zooplankton and the small fish?

A

1.5%1.5\%1.5%

B

12%12\%12%

C

15%15\%15%

D

85%85\%85%

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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