The light-independent stage and limiting factors

The light-independent stage and limiting factors Quiz

Spec 5.7 · Edexcel A-Level Biology B: Quiz

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5 questions, one answer each

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  1. 1. Which compound combines with carbon dioxide in the Calvin cycle?

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

  2. 2. What is GP reduced to in the Calvin cycle?

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

  3. 3. Where does the Calvin cycle take place?

    • A. Thylakoid membrane
    • B. Stroma
    • C. Envelope
    • D. Cytoplasm

  4. 4. When light is switched off, what happens to GP and RuBP concentrations?

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

  5. 5. The rate of photosynthesis stops rising when carbon dioxide is increased further. What is the most likely reason?

    • A. The carbon dioxide has become poisonous
    • B. Another factor, such as light intensity or temperature, is now limiting
    • C. RUBISCO has been used up completely
    • D. The leaf has run out of oxygen

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