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9.3 Material cycles and decomposition

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Question 7

Organic waste settles on the bed of an oxygenated pond. Bacteria and fungi break down the waste. Measurements taken close to the waste show that dissolved oxygen decreases while dissolved carbon dioxide increases.

Which process carried out by the bacteria and fungi directly causes both changes?

[1]
A

Aerobic respiration by the bacteria and fungi

B

Secretion of digestive enzymes by the bacteria and fungi

C

Absorption of soluble products by the bacteria and fungi

D

Release of mineral ions by the bacteria and fungi

Markscheme

9.3 Material cycles and decomposition Questions

  1. GCSE
  2. /Biology
  3. /9.3 Material cycles and decomposition

101 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.

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