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9.3 Material cycles and decomposition

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Question 16
F

A carbon atom is present in a dead leaf. It later becomes part of a new leaf on a different plant.

Which sequence could explain this transfer?

[1]
A

Decomposer photosynthesis releases nitrates, then the plant absorbs these nitrates.

B

Decomposer photosynthesis releases carbon dioxide, then the plant respires.

C

Decomposer respiration releases nitrates, then the plant absorbs these nitrates.

D

Decomposer respiration releases carbon dioxide, then the plant photosynthesises.

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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