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Question 18N.3.HL.TZ0.b

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.HL.TZ0.b
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.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 ✔

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