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Photosynthesis · Paper 1 — Free Biology SL Practice Questions
1FoundationMCQThe light-dependent and light-independent reactions1 markPaper 1~2 min
A student investigates the light-dependent reactions of photosynthesis using isolated chloroplasts suspended in a buffer solution containing a blue dye that turns colourless when reduced. The suspension is illuminated with white light, and oxygen production is recorded. After 5 minutes, the light is switched off; oxygen production stops immediately, but the dye continues to decolourise for a further 2 minutes. Which statement best explains why the dye continues to decolourise after the light is switched off?
Solutions
2MasteryMCQThe light-dependent and light-independent reactions1 markPaper 1~2 min
Isolated thylakoid membranes are suspended in a buffer at pH 8 and illuminated with white light. After 10 minutes, the light is switched off and a specific inhibitor of ATP synthase is added. What is the immediate effect of the inhibitor on NADPH production?
Solutions
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