February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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9Limiting Factors PhotosynthesisMedium1 mark
A student investigated the rate of photosynthesis in tomato plants. The graph shows the results.
Graph of rate of photosynthesis against light intensity, rising steeply and then levelling off, with point X on the rising part of the curve
Which factor does the graph indicate is limiting the rate of photosynthesis at X?