CAIE IGCSE Biology 22.3.2 Geometry Measurement and Biological Scales Topic Practice

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22.3.2 Geometry, measurement and biological scales question 1

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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 scientists carried out another investigation using the same apparatus at different temperatures.

They measured the rate of uptake of carbon dioxide in the light and then they measured the rate of release of carbon dioxide in the dark.

The results are shown in Fig. 3.2.
rate of carbon dioxide uptake and release /μg/ \mu \mathrm{g} per hour per cm2\mathrm{cm}^{2} of leaf

Fig. 3.2

Fig. 3.2

Explain why the results in Table 3.1 are expressed as 'per cm2\mathrm{cm}^{2} of leaf' rather than 'per leaf'.

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