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9.3 Material cycles and decomposition

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Question 11
F

A farmer grows peas and then ploughs the pea plants into the soil before planting wheat.

Which sequence explains how this can increase the nitrogen available to the wheat?

[1]
A

Roots absorb nitrogen gas, then transpiration releases nitrates into soil.

B

Root bacteria fix nitrogen, then decay and nitrification supply soil nitrates.

C

Root bacteria fix nitrogen, then transpiration releases nitrates into soil.

D

Roots absorb nitrogen gas, then photosynthesis releases nitrates into soil.

Markscheme

9.3 Material cycles and decomposition Questions

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

44 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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