CAIE IGCSE Biology 19.3.2 The Nitrogen Cycle
Practise tracing nitrogen through fixation, nitrification, plant uptake, feeding, decomposition, deamination and denitrification.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- label nitrogen fixation, nitrification, decomposition and denitrification on cycle diagrams
- trace nitrate uptake into plant amino acids and proteins, then transfer through feeding
- identify ammonium and nitrate ions and link each bacterial process to its conversion
19.3.2—Nitrogen cycle with reference to: • question 1
Fig. 5.1 is a diagram of a plant root hair cell.
Key
× nitrate ion
- water molecule
Fig. 5.1
State two ways that nitrogen fixation occurs.
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