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7.4 Trophic levels in an ecosystem

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Question 7

In a freshwater stream, algae are eaten by mayfly larvae, which are eaten by trout, which are eaten by otters.

For this food chain, the biomass transferred to each successive trophic level is one fifth of the biomass at the level below. In a pyramid of biomass drawn to scale, the bar for trophic level 3 is 25 mm wide.

How wide should the bar for trophic level 4 be?

[1]
A

5 mm

B

125 mm

C

20 mm

D

1 mm

Markscheme

7.4 Trophic levels in an ecosystem Questions

  1. GCSE
  2. /Biology
  3. /7.4 Trophic levels in an ecosystem

103 exam-style questions on AQA GCSE Biology 7.4 Trophic levels in an ecosystem, covering 7.4.1 Trophic levels, 7.4.2 Pyramids of biomass, and 7.4.3 Transfer of biomass. Each one has a worked solution and a mark scheme showing where the marks go.

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