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9.3 Material cycles and decomposition

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Question 20

Lettuce plants were grown for 21 days in nutrient solutions with different nitrate concentrations. All other conditions were kept the same. The table shows the mean protein mass per plant at the end of the investigation.

Nitrate concentration in solution (mg/L)Mean protein mass per plant (mg)
012
2518
5024
7529

Explain how the results support a link between nitrate ions and protein production in the lettuce plants.

[4]
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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