CAIE IGCSE Biology 19.3.3 Roles of Microorganisms Questions
Microorganisms drive four key nitrogen-cycle processes: decomposition, nitrification, nitrogen fixation and denitrification.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- identify decomposition, nitrification, nitrogen fixation and denitrification as microorganism roles in nitrogen-cycle diagrams
- explain how nitrifying bacteria convert ammonium ions to nitrate ions, making nitrate available for plant uptake
CAIE IGCSE Biology 19.3.3 Roles of Microorganisms Questions question 1
The diagram shows part of the nitrogen cycle.
Which row identifies the bacteria involved in processes W, X, Y and Z ?
W
X
Y
Z
denitrifying
decomposer
nitrifying
nitrogen-fixing
denitrifying
nitrifying
decomposer
nitrogen-fixing
nitrifying
decomposer
nitrogen-fixing
denitrifying
nitrogen-fixing
nitrifying
decomposer
denitrifying
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