| Date | May 2012 | Marks available | 2 | Reference code | 12M.3.SL.TZ1.17 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Outline | Question number | 17 | Adapted from | N/A |
Question
Denitrification is part of the nitrogen cycle. Outline the conditions that favour denitrification in the environment.
Markscheme
anaerobic conditions / absence of air/oxygen;
(facultatively) anaerobic bacteria / Bacillus/Thiobacillus/Pseudomonas genera;
soil is waterlogged/bogs/marshes/other valid example;
Examiners report
All parts of this question seemed to prove difficult. In part (b), understanding of the nitrogen cycle was very poor for those who attempted it.
Syllabus sections
Option C: Ecology and conservation » Option C: Ecology and conservation (Additional higher level topics) » C.6 Nitrogen and phosphorus cycles
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