Photosynthesis light intensity graphs
Photosynthesis rate against light intensity with three lines on one graph, each at a different carbon dioxide concentration or temperature. The graph builder draws the limiting factor picture pupils have to interpret, with experimental data and an anomaly on a toggle.
A hand-built replica of the real builder page, not a screenshot. Every control shown exists in the product.
Part of the Graph builder family. See Enzyme activity graphs page to explore further.
Why this works in Biology
Limiting factors are taught from this graph, the lowest line levels off first and raising the other factor lifts the plateau. Three curves sketched by hand rarely keep that story straight, and here each is computed, so the plateaus land in the right order every time.
Vary carbon dioxide or temperature and set the three values yourself, then use the tangent tool for the initial rate at higher tier. Download the graph for a worksheet or assessment, or use it in questions within Plenary Studio.
Limiting factor graphs for photosynthesis
Every image here is free to use in your teaching under our image licence.
Carbon dioxide as the limiting factor, each line levels off at a different rate.Download image, Carbon dioxide as the limiting factor, each line levels off at a different rate. 
Temperature as the limiting factor, the plateau is highest at 20 °C and lower both colder and hotter.Download image, Temperature as the limiting factor, the plateau is highest at 20 °C and lower both colder and hotter. 
Experimental readings scatter around each curve, the way real results do.Download image, Experimental readings scatter around each curve, the way real results do.
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