CAIE IGCSE Biology 22.1.3 Manipulating Numerical Data
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
22.1.3 Manipulate numerical and other data question 1
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
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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