Unit B624/02 - OCR
Unit B624/02 - OCR
Unit B624/02 - OCR
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(b) The decay of dead plants and animals is an<br />
important step in the nitrogen cycle.<br />
The diagram shows part of the cycle.<br />
proteins and<br />
urea<br />
A<br />
nitrates<br />
nitrogen<br />
gas<br />
D<br />
C<br />
B<br />
ammonium<br />
compounds<br />
(i) Which step in the cycle shows decay?<br />
Choose from A, B, C or D.<br />
answer __________ [1]<br />
(ii) Nitrogen gas can be converted into nitrogen<br />
compounds, such as nitrates.<br />
Write down TWO ways that this can happen.<br />
1 ______________________________________<br />
2 ____________________________________ [2]<br />
6
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