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Limiting factors and single-factor graphs

Bioenergetics • Photosynthesis

Key concepts

What you'll likely be quizzed about

  • A limiting factor is any variable that restricts the rate of photosynthesis.
  • If a necessary condition is insufficient, the overall rate of photosynthesis decreases until the limiting factor is restored.
  • In investigations, controlling other variables isolates the effect of the chosen limiting factor, allowing for a clear observation of its impact on the rate.

Flashcards

Test your knowledge with interactive flashcards

Interpreting units on axes

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Ensure correct units (e.g., ppm for CO2 or cm³ O2 min⁻¹ for photosynthesis rate) before interpreting graph values.

Key notes

Important points to keep in mind

Limiting factor = single condition lowering the overall rate.

Graph shapes show cause→effect: rising slope = plotted factor limiting; plateau = another limiting factor.

Temperature raises rates until optimum, then causes denaturation.

Light intensity follows 1/distance²; use this for intensity calculations.

CO2 concentration boosts rates while CO2 is limiting; high levels generate diminishing returns.

Isolate one limiting factor by keeping others constant in a practical experiment.

Convert graph readings to numbers via axis readings and slope calculations.

Clearly report units and methods when translating graph points to numeric form.

Plateaus signify that additional additions of the plotted factor do not enhance the rate; determine the new limiting factor.

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