What is transpiration?
The process where plants lose water vapour mainly from their leaves.
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List 4 environmental factors that affect transpiration rate?
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What is the independent variable in the transpiration practical?
The environmental factor being changed (temperature, humidity, wind speed or light intensity).
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What is the dependent variable in the transpiration practical?
The rate of transpiration.
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What equipment is used to measure transpiration rate?
A potometer.
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Why should the leafy shoot be cut underwater before inserting into the potometer?
To prevent air bubbles from entering the vascular tissues which would affect results.
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How could the effect of an environmental variable on transpiration rate be displayed?
By plotting a graph of the variable (x-axis) against transpiration rate (y-axis).
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