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4.1 Ecosystems

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Question 3

In food chains, biomass is lost between different trophic levels.

One reason for this is the elimination of toxic waste products produced by chemical reactions inside cells (metabolic waste), such as urea.

Which term is used to describe this process?

A

Assimilation

B

Egestion

C

Excretion

D

Ingestion

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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