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CAIE IGCSE Biology 8.3.3 Investigating Transpiration Rate

Practise investigating how temperature and wind speed change water loss using timed mass or volume measurements.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • calculate transpiration rate from decrease in mass or water volume divided by elapsed time
  • vary temperature or wind speed while controlling humidity, leaf area and the other environmental factors
  • explain faster water loss at higher temperature through kinetic energy and increased evaporation

8.3.3—Effects of variation of temperature question 1

[Maximum number: 3]

Fig. 5.1 is a graph showing the effect of temperature on the rate of transpiration from the upper and lower surfaces of a leaf that is provided with a constant supply of water.

Fig. 5.1

Fig. 5.1

Describe the results shown in Fig. 5.1.

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