19.3 Nutrient cycles
- Syllabus
- 0610–2026–2027
- Topic
- 19.3
- Level
- —
19.3.1—Carbon cycle
- Describe the carbon cycle, limited to: photosynthesis, respiration, feeding, decomposition, formation of fossil fuels and combustion
19.3.2—Nitrogen cycle with reference to: •
- Describe the nitrogen cycle with reference to: • decomposition of plant and animal protein to ammonium ions • nitrification • nitrogen fixation by lightning and bacteria • absorption of nitrate ions by plants • production of amino acids and proteins • feeding and digestion of proteins • deamination • denitrification
19.3.3—Roles of microorganisms
- State the roles of microorganisms in the nitrogen cycle, limited to: decomposition, nitrification, nitrogen fixation and denitrification (generic names of individual bacteria, e.g. Rhizobium, are not required)
Objective notes
3 learning objectivesConceptIGCSE Biology