May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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33Energy Flow Nutrient CyclesEasy1 mark
The diagram shows part of the nitrogen cycle. Which change is caused by the action of denitrifying bacteria?
Part of the nitrogen cycle: arrow A from nitrogen gas in the air down to nitrate in the soil, and arrow D from nitrate in the soil up to nitrogen gas in the air; plants pass to animals by feeding; death of plants and animals leads by arrow B to nitrate in the soil; faeces and urine from animals lead by arrow C to nitrate in the soil