Free response practice
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This document contains a two-part free response question about transpiration rate in plants. [1] It provides background information on transpiration occurring through stomata and how environmental factors impact the rate. [2] Data is given showing that transpiration rate increases with temperature up to 27°C then decreases slightly at 28°C. [3] Part A asks the student to graph this data and explain the shape of the curve from 23-28°C, while Part B asks them to graph and justify the predicted effects of increasing humidity on transpiration rate at constant temperature.
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- 3. Transpiration Rate versus Temperature Temp º C 20 23 27 28 Transpiration rate mmol/m 1.5 3 5 4.5
- 4. Temp º C 20 23 27 28 Transpiration rate mmol/m 1.5 3 5 4.5 a. Using the data above and graph paper, draw a graph showing the effect of temperature on the rate of transpiration. Explain the shape of the curve from 23 degrees to 28 degrees. Scan or photograph your graph and upload.
- 5. b. Humidity is an environmental factor that affects transpiration rate. Using graph paper, draw a curve that illustrates what you predict would be the rate of transpiration with increasing humidity and constant temperature. Justify the shape of the curve based on your prediction. Upload you graph.