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4.1 Ecosystems

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Question 23
H

In a field, the biomass of the producers is 8.0 kg/m2.

The biomass of the primary consumers is 600 g/m2.

What is the efficiency of biomass transfer from the producers to the primary consumers?

[1]
A

0.075%0.075\%0.075%

B

7.5%7.5\%7.5%

C

13.3%13.3\%13.3%

D

75%75\%75%

Markscheme

4.1 Ecosystems Questions

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

111 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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