Question 28
[Maximum number: 1]
Some substances found in water extracted from a river are listed.
1 plastics
2 nitrates
3 oxygen
Which substances are harmful to aquatic life?
A
1 and 2
B
1 and 3
C
2 only
D
3 only
CAIE IGCSE Chemistry Water Pollution and Aquatic Harm
Practise identifying plastics, toxic compounds, sewage microbes and fertiliser ions as water pollutants and linking each to disease or aquatic damage.
How this is tested
- identify plastics and toxic metal compounds as pollutants that damage aquatic life
- link nitrates and phosphates from fertilisers to deoxygenation and aquatic harm
- link untreated sewage microbes or inadequate clean water supply with human disease