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biology 0610printed 296 · PDF 296
328 pagesrevision 46933
printed 296 · PDF 296
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Aitchison College Academic
Over-use of fertilisers on farmland causes the chemicals in the fertilisers to be washed into ponds
and lakes.
This causes eutrophication resulting in the following events.
1 algae grow
2 fish die
3. bacteria grow
4 oxygen decreases
What is the correct sequence of these events?
A 1335452
B 1343532
C 3442-1
D 4391-23
What is reduced when untreated sewage is released into rivers?
A the amount of nitrate
B the concentration of carbon dioxide
C_ the concentration of oxygen
D
the number of bacteria
T
Which pollutants of water can lead to eutrophication?
fertilisers herbicides | insecticides sewage
A v v x x
B v x x v
c x v ¥ x
D x x ¥ v
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