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CAIE IGCSE Biology 22.3.1 Numerical and Algebraic Calculations

CAIE IGCSE Biology 22.3.1 Numerical and Algebraic Calculations
Cambridge IGCSE Biology 0610 syllabus for exams in 2026, 2027 and 20282026–2028

Practise calculating percentage increases in photosynthesis rate, showing working and rounding answers, then determining rates by dividing volume by elapsed time.

How this is tested

  • calculate percentage increase from two photosynthesis rates and round to the nearest whole number
  • derive photosynthesis rate by dividing gas volume by the stated collection time

Question 2(c)(iii)

[Maximum number: 2]

The rate of photosynthesis of terrestrial plants can be determined by measuring the uptake of carbon dioxide.

A student used the apparatus shown in Fig. 2.1 to investigate the effect of temperature on the rate of photosynthesis of the leaves of Chinese plantain, Plantago asiatica, at two different concentrations of carbon dioxide, A and B.
rate of photosynthesis /μmol/ \mu \mathrm{mol} per m2\mathrm{m}^{2} per s

Fig. 2.2 shows the results of the investigation.

Fig. 2.2 shows the results of the investigation.

Calculate the percentage increase in the rate of photosynthesis at 30∘C30^{\circ} \mathrm{C} when the carbon dioxide concentration was increased from A to B as shown in Fig. 2.2.

Show your working and give your answer to the nearest whole number.