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IB Biology HL 1.3.7 Limiting Factors in Photosynthesis

Practise analysing limiting-factor experiments at HL depth, linking light and carbon dioxide to rate, evaluating controls and explaining temperature effects on photosynthetic…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse limiting-factor curves to identify the controlling variable and plateau conditions.
  • Evaluate controlled photosynthesis experiments using indicator systems, variables and plotted evidence.
  • Explain how high temperature reduces photosynthesis through enzyme denaturation and recovery data.

C1.3.7—Limiting factors investigation question 1

[Maximum number: 2]

The boreal forests are situated close to the north pole and even in summer the intensity of sunlight is lower than at the equator. Sketch a graph showing the effect of light on the rate of photosynthesis, labelling the axes.

Figure for Question C1.3.7—Limiting factors investigation question 1 — IB Biology HL
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