AQA A-Level Biology 2025/6

Biology • A-Level

Question 1 of 40

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Which statement correctly describes the overall equation of photosynthesis and the role of chloroplasts in a photoautotrophic organism?

Hint: Recall which molecules are the reactants and products in photosynthesis and whether light is required.

In photoautotrophs, chloroplasts convert carbon dioxide and water into ATP and NADPH, which are then used in the mitochondria to produce glucose, as shown by the equation 6CO₂ + 6H₂O + light → ATP + NADPH. In photoautotrophs, chloroplasts convert carbon dioxide and water into glucose and oxygen using light energy, as shown by the equation 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂. In photoautotrophs, chloroplasts store glucose produced by mitochondria, and the overall equation is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ without requiring light. In photoautotrophs, chloroplasts convert glucose and oxygen into carbon dioxide and water using light energy, as shown by the equation C₆H₁₂O₆ + 6O₂ + light → 6CO₂ + 6H₂O.

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