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GCSE Combined Science · key term
A plant such as a pea, bean or clover that can have nitrogen-fixing bacteria living in nodules on its roots.
Used by Edexcel
Paper 1, Paper 2
Revise: The nitrogen cycle and nitrate availabilitySome of these bacteria live freely in soil; others live in root nodules, small swellings on the roots of legumes such as peas, beans and clover.
When explaining crop rotation, link legumes to root-nodule bacteria, then explain how decomposition and nitrification make nitrogen available to the next crop.
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