Biology 0610 · 19 Organisms and their environment
19.3 Nutrient cycles
Describe the carbon and nitrogen cycles, detailing the roles of microorganisms in decomposition, nitrification, and nitrogen fixation.
- Questions
- 145
- Years
- 2015–2026
- Multiple choice
- 117
- Written answer
- 28
- Average marks
- 3
Practise organisms and their environment questions with instant markingTeachers: build a worksheet from past papers
Where this subtopic appears
- Paper 1variants 11, 12, 1368
- Paper 2variants 21, 22, 2351
- Paper 3variants 31, 32, 3313
- Paper 4variants 41, 42, 4313
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | 1 | 10 | – | 11 |
| 2023 | 3 | 2 | 7 | 12 |
| 2022 | 1 | 7 | 10 | 18 |
| 2021 | 3 | 4 | 9 | 16 |
| 2020 | – | 9 | – | 9 |
| 2019 | 2 | 3 | 9 | 14 |
| 2018 | 3 | 8 | 9 | 20 |
| 2017 | 3 | 7 | 8 | 18 |
| 2016 | 1 | 6 | 3 | 10 |
| 2015 | 2 | 9 | 6 | 17 |
