Photosynthesis Respiration and Ecosystem Energy Flow Practice Questions | A-Level Biology

Photosynthesis Respiration and Ecosystem Energy Flow

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A leaf is illuminated with saturating light and supplied with abundant CO2 at the optimum temperature. The measured ATP production rate in chloroplasts increases when chloroplasts with highly developed grana are used rather than chloroplasts with fewer stacked thylakoids. Which structural explanation is most directly responsible for this increase?

Select one option.

More stromal enzymes are present for carbon fixation
A thicker chloroplast envelope improves CO2 diffusion
Stacked thylakoid membranes provide greater area for electron carriers and ATP synthase
More starch grains reduce feedback inhibition of photosynthesis
More chloroplast DNA increases transcription of Calvin cycle enzymes

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