GCSE Biology (AQA)

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Limiting Factors

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Bioenergetics Photosynthesis

Limiting Factors

3:54 Photosynthesis Limiting Factors and their Economics
Spec 4.4.1.2
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  • Light intensity, carbon dioxide concentration, temperature, and chlorophyll levels all affect the rate of photosynthesis.
  • These factors are essential for considering the rate of photosynthesis in plants.
  • Any of these factors can limit the rate of photosynthesis, and their effects can be displayed graphically.
  • Graphs can show how different factors like light intensity and temperature affect photosynthesis under various conditions.
  • Graphs help identify which factor is the limiting factor when the rate of photosynthesis does not increase despite increases in light intensity or other conditions.
  • The example graph shows that at low temperatures, even with high light intensity, the rate of photosynthesis is limited.
  • Another graph example indicates that the limiting factors could be either carbon dioxide concentration or chlorophyll levels when other conditions are optimal.
  • Understanding graphs involves identifying command words like "explain," analyzing the factors shown, and determining how each factor affects photosynthesis.
  • The process includes comparing different lines on the graph to ascertain which factor limits the rate of photosynthesis under specific conditions.
  • The final step in graph analysis is stating the limiting factor and explaining the reason, using comparative data from the graph.

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