Light-independent reactions and the Calvin cycle

Light-independent reactions and the Calvin cycle Quiz

Spec 5.4 · Edexcel International A Level Biology: Quiz

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  1. 1. What is the first stable product when carbon dioxide is fixed by RUBISCO?

    • A. RuBP
    • B. GP
    • C. GALP
    • D. Glucose

  2. 2. Which statement about the Calvin cycle is correct?

    • A. GP is oxidised using ATP
    • B. GP is reduced using reduced NADP and ATP
    • C. RuBP is reduced to GP
    • D. GALP is made in the thylakoid lumen

  3. 3. How many reduced NADP are needed to fix 3 molecules of carbon dioxide?

    • A. 3
    • B. 6
    • C. 9
    • D. 2

  4. 4. A plant is moved from light to dark with plenty of CO₂. What happens to GP and RuBP immediately?

    • A. Both rise
    • B. GP falls, RuBP rises
    • C. GP rises, RuBP falls
    • D. Both fall

  5. 5. Why is only a small fraction of GALP used to make hexose sugars?

    • A. GALP is toxic in high concentration
    • B. Most is needed to regenerate RuBP
    • C. GALP cannot be converted to hexose
    • D. Most GALP is converted back into GP

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