1
1 mark
1 markThe diagram below illustrates part of the carbon cycle.
Which process is shown by the arrow labelled Y?
Photosynthesis
Feeding
Respiration
Combustion
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Nutrient Cycles (Cambridge O Level Biology)
Topic Questions
21 mark
1 markWhich of the processes below is carried out by bacteria in the roots of leguminous plants?
Nitrogen fixation
Decomposition
Nitrification
Denitrification
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11 mark
The diagram shows the movement of carbon in the carbon cycle, in gigatonnes per year.
How many gigatonnes of carbon are moved by respiration each year?
120
125
130
255
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11 mark
1 markThe diagram below shows part of the nitrogen cycle.
Which letter would represent denitrification?
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21 mark
Which stage of the carbon cycle depends on the presence of bacteria and fungi in the soil?
combustion
decomposition
photosynthesis
respiration
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