DP Biology (last assessment 2024)
Question 18N.3.HL.TZ0.9b
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.HL.TZ0.9b |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18N.3.HL.TZ0.9b
(b)
The formation of hydrophobic concrete is an example of how biofilms can be useful. Outline one example where biofilms can cause environmental problems.
[2]
Markscheme
a. example of where biofilm cause problems ✔
eg: clogging/corrosion of pipes/water systems ✔
slows down/interrupts/clogs water supply systems ✔
OR
eg: contamination of surfaces in food production ✔
causes food transmitted diseases ✔
OR
eg: plaque formation on teeth ✔
causes cavities ✔
OR
eg: catheter clogging ✔
causes urinary infections ✔
b. description of problems ✔
