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O LevelBiologyCambridgeExam Questions19. Relationships of Organisms with one another & with the Environment19.2 Nutrient Cycles

Nutrient Cycles (Cambridge O Level Biology)

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19.2 Nutrient Cycles

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19.2 Nutrient Cycles

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1
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The diagram below illustrates part of the carbon cycle. 

M6dM0Bdf_image-1-1

Which process is shown by the arrow labelled Y?

  • Photosynthesis

  • Feeding

  • Respiration

  • Combustion

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2
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Which of the processes below is carried out by bacteria in the roots of leguminous plants?

  • Nitrogen fixation

  • Decomposition

  • Nitrification

  • Denitrification

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1
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The diagram below shows part of the nitrogen cycle. 

f8MF0E4W_image-4-1

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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    11 mark

    The diagram shows the movement of carbon in the carbon cycle, in gigatonnes per year.q1-19-2-nutrient-cycles-hard-mcq-cie-o-level-biology How many gigatonnes of carbon are moved by respiration each year?

    • 120

    • 125

    • 130

    • 255

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