May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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36Energy Flow Nutrient CyclesEasy1 mark
The diagram shows some of the stages in the nitrogen cycle. Which arrow represents the process of nitrogen fixation?
Some stages in the nitrogen cycle, not to scale: arrow A from nitrogen in the air to the root nodules of a bean plant; arrow B from the bean plant to dead organic matter; arrow C from the bean plant to a herbivore; an arrow from dead organic matter to nitrates; and arrow D from nitrates to nitrogen in the air