CAIE IGCSE Biology 6.1.8 Effects of Varying Light Intensity Questions

Practise measuring photosynthesis rate and investigating how light intensity, carbon dioxide concentration and temperature affect it, while controlling other variables.

Exam points

Calculate photosynthesis rate from experimental measurements over time.
Use data to describe or predict how light intensity, carbon dioxide concentration and temperature affect the rate.
Choose other variables to control in a photosynthesis investigation.

[Maximum number: 1]

The diagram shows an experiment investigating the effect of light intensity on an aquatic plant.

Figure for Question CAIE IGCSE Biology 6.1.8 Effects of Varying Light Intensity Questions question 1 — CAIE IGCSE Biology

Photosynthesis occurred in both test-tube P and test-tube Q . Both test-tubes were kept at the same temperature. The number of bubbles produced in test-tube P was 12 bubbles per minute.

What is the most likely number of bubbles produced in one minute in test-tube Q ?

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CAIE IGCSE Biology 6.1.8 Effects of Varying Light Intensity Questions question 1