DP Biology (last assessment 2024)
Question 18M.3.HL.TZ1.9a.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.HL.TZ1.9a.ii |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 1]
18M.3.HL.TZ1.9a.ii
The diagram shows an industrial anaerobic fermenter.
(a.ii)
Outline one variable that must be controlled in an industrial fermenter
[1]
Markscheme
a. anaerobic conditions / prevent entry of oxygen
b. warm temperatures / temperature above 15°C
c. different communities of microorganisms / Eubacteria and methanogens
d. proper pH needs to be maintained
