CAIE IGCSE Biology 6.1.8 Factors Affecting Photosynthesis Rate

Practise measuring photosynthesis rate while varying light, carbon dioxide or temperature, controlling other variables and explaining limitations of oxygen-based measurements.

Exam points

calculate photosynthesis rate from carbon-dioxide concentration change per unit time or compare bubble counts per minute
describe how increasing light intensity or temperature changes photosynthesis rate using data
identify temperature, light intensity, water supply or humidity as variables to keep constant in a photosynthesis investigation

[Maximum number: 2]

The investigation was repeated with the same type of aquatic plant at $10^{\circ} \mathrm{C}$ .

Draw a line on Fig. 4.2 to predict the results at $10^{\circ} \mathrm{C}$ .

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6.1.8—Effects of varying light intensity question 1