| Date | November 2010 | Marks available | 2 | Reference code | 10N.3.HL.TZ0.8 |
| Level | Higher level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Outline | Question number | 8 | Adapted from | N/A |
Question
State two nitrogen-fixing bacteria.
[1]
a(i).
Outline the conditions that favour denitrification.
[2]
a(ii).
Markscheme
Award [1] for any two of the following.
Rhizobium / Azotobacter / Cyanobacteria / Frankia
a(i).
anaerobic conditions;
due to waterlogged soils;
a(ii).
Examiners report
This question was not very well answered by most candidates.
a(i).
This question was not very well answered by most candidates.
a(ii).
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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