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9.2 Energy transfer and biodiversity

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Question 7
F

After an algal bloom, large amounts of dead plant material accumulate in a lake. Fish then die.

Which sequence best explains the fish deaths?

[1]
A

more decomposition →\rightarrow→ more oxygen used →\rightarrow→ less aerobic respiration in fish

B

more decomposition →\rightarrow→ more oxygen produced →\rightarrow→ less aerobic respiration in fish

C

less decomposition →\rightarrow→ more oxygen used →\rightarrow→ more aerobic respiration in fish

D

less decomposition →\rightarrow→ more oxygen produced →\rightarrow→ more aerobic respiration in fish

Markscheme

9.2 Energy transfer and biodiversity Questions

  1. GCSE
  2. /Biology
  3. /9.2 Energy transfer and biodiversity

38 exam-style questions on Edexcel GCSE Biology 9.2 Energy transfer and biodiversity, covering 9.2.1 Energy transfer between trophic levels, 9.2.2 Efficiency of energy transfers, 9.2.3 Human interactions and biodiversity, 9.2.4 Benefits of maintaining biodiversity, and 9.2.5 Biological factors affecting food security. Each one has a worked solution and a mark scheme showing where the marks go.

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