DP Biology (last assessment 2024)
Question 19N.3.SL.TZ0.8b
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.SL.TZ0.8b |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Identify | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
19N.3.SL.TZ0.8b
The diagram below represents a small-scale biogas fermenter.
[Source: © Science in Society. http://www.i-sis.org.uk/BiogasChina.php]
(b)
Identify the ideal temperature and oxygen conditions inside the fermenter for efficient biogas production.
Temperature:
Oxygen:
[1]
Markscheme
temperature warm and oxygen concentration low / anaerobic ✔
Accept above room temperature / 20 to 70°C for warm, depending on bacteria used.
Both required.
