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Question 9

From Biology HL Paper 1 (May 2024, TZ2)

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  1. The graph shows the effect of increasing light intensity on the rate of photosynthesis during an experiment carried out at optimum temperature and normal atmospheric CO2 concentration.
A line graph showing the rate of photosynthesis on the y-axis and light intensity on the x-axis. The curve rises initially and then plateaus. Point X is marked on the plateau region of the curve.
A line graph showing the rate of photosynthesis on the y-axis and light intensity on the x-axis. The curve rises initially and then plateaus. Point X is marked on the plateau region of the curve.

Which factor could be limiting photosynthesis at point X on the graph?

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