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biology 0610printed 297 · PDF 297
328 pagesrevision 46933
printed 297 · PDF 297
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Aitchison College Academic
What are the possible effects of deforestation?
ieee Oh ate flooding decrease in atmospheric
carbon dioxide
A v v x
B v x v
c x v x
D x x v
Which agricultural activity can cause the most pollution?
A adding artificial fertilisers
B cutting down trees
C digging plant material into the soil
D growing high-yielding crops
10.
Untreated sewage can cause pollution of streams and rivers. Some changes in streams and
rivers after sewage is added are shown.
1 fish die
2 the dissolved oxygen in the water decreases
3. the number of anaerobic organisms increases
4
the number of bacteria increases
What gives the order in which these events occur?
A 19243
B 134332
C 2313453
D 4521-3
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