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CAIE IGCSE Biology 22.1.3 Manipulate Numerical and Other Data Questions

Practise calculating a biological rate by finding the difference between carbon dioxide readings and dividing that change by the 15-minute interval.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • subtract carbon dioxide readings before dividing by 15 minutes to calculate photosynthesis rate

CAIE IGCSE Biology 22.1.3 Manipulate Numerical and Other Data Questions question 1

[Maximum number: 2]

Scientists measured the rate of photosynthesis in the leaves of a sunflower plant, Helianthus annuus.

The scientists used the apparatus shown in Fig. 3.1 to measure the rate of photosynthesis.

Fig. 3.1

Fig. 3.1

The apparatus in Fig. 3.1 maintains a constant temperature and a constant humidity.

The apparatus was left for 15 minutes.

Explain how the scientists would use the readings for the concentration of carbon dioxide in chambers 1 and 3 to calculate the rate of photosynthesis.

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