DP Biology (first assessment 2025)
Question 21N.2.SL.TZ0.b.iii
| Date | November 2021 | Marks available | [Maximum mark: 1] | Reference code | 21N.2.SL.TZ0.b.iii |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Suggest | Question number | b.iii | Adapted from | N/A |
b.iii.
[Maximum mark: 1]
21N.2.SL.TZ0.b.iii
Suggest a reason for a larger percentage of corals being infected with white syndrome on reefs with a higher cover of corals.
[1]
Markscheme
a. the closer the corals are (to each other) the easier the transmission;
b. other organisms in the community may act as vectors/carriers / OWTTE;
Examiners report
In 1b (iii) the better students realised that it was to do with higher density of corals, not just the more vague ‘higher cover’ given in the stem.
