Transpiration (OCR A-Level Biology A): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does the term 'transpiration' specifically refer to?
What does the term 'transpiration' specifically refer to?
Evaporation of water from leaves
What surrounds each stoma in the leaf epidermis?
What surrounds each stoma in the leaf epidermis?
A pair of guard cells
Why does water vapour diffuse out through stomata?
Why does water vapour diffuse out through stomata?
Higher water potential inside than outside
How does increasing temperature affect transpiration rate?
How does increasing temperature affect transpiration rate?
Increases it by raising kinetic energy
What happens to transpiration rate as humidity increases?
What happens to transpiration rate as humidity increases?
Decreases due to reduced gradient
How does air movement increase transpiration rate?
How does air movement increase transpiration rate?
Moves water molecules away from leaf
What happens to transpiration when light intensity is increased above the threshold for stomatal opening?
What happens to transpiration when light intensity is increased above the threshold for stomatal opening?
No additional effect on rate
What does a potometer measure?
What does a potometer measure?
Rate of water uptake by the plant
Why must the plant stem be cut underwater when setting up a potometer?
Why must the plant stem be cut underwater when setting up a potometer?
To prevent air entering the xylem
In still air, why does transpiration rate slow down?
In still air, why does transpiration rate slow down?
Water accumulates near leaf surface