DP Biology (last assessment 2024)
Question 19M.3.HL.TZ2.9
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.HL.TZ2.9 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | State | Question number | 9 | Adapted from | N/A |
9.
[Maximum mark: 2]
19M.3.HL.TZ2.9
Citric acid is produced on an industrial scale and global production is over 1.4 million tons
per year with a rising trend in demand.
(a.i)
State one industrial use of citric acid.
[1]
Markscheme
flavour enhancer/«food» preservative ✔
Examiners report
Candidates did generally well in all parts of this question.
(a.ii)
State the scientific name (binomial) of the microorganism usually used in this process.
[1]
Markscheme
Aspergillus niger ✔
Both names in full required.
Examiners report
Candidates did generally well in all parts of this question.