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C3, C4 and CAM plants Knowledge-Based Practice

Biology · Cellular Energetics · Biology · Photosynthesis

1 Biology practice questions on C3, C4 and CAM plants. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which of the following statements correctly distinguishes the carbon fixation strategy of CAM plants from that of C4 plants?

    • A) CAM plants separate initial carbon fixation and the Calvin cycle into two distinct cell layers, whereas C4 plants separate these steps according to the time of day.
    • B) CAM plants fix carbon dioxide into organic acids at night, whereas C4 plants fix carbon dioxide into four-carbon acids in mesophyll cells during the day.
    • C) CAM plants rely exclusively on Rubisco for initial carbon uptake, whereas C4 plants rely exclusively on PEP carboxylase for all carbon reactions.
    • D) CAM plants completely bypass the Calvin cycle to make sugars, whereas C4 plants run the Calvin cycle within bundle-sheath cells.

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