Measuring Water Uptake Using a Potometer (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does a potometer measure?
What does a potometer measure?
Rate of water uptake by plant shoots
What percentage of water absorbed by a plant is lost through transpiration?
What percentage of water absorbed by a plant is lost through transpiration?
99%
Why must the shoot be cut underwater when setting up a potometer?
Why must the shoot be cut underwater when setting up a potometer?
To prevent air entering xylem vessels
What formula calculates water volume absorbed? ( = radius, = distance bubble moved)
What formula calculates water volume absorbed? ( = radius, = distance bubble moved)
How does higher temperature affect transpiration rate?
How does higher temperature affect transpiration rate?
Increases it due to increased evaporation
How does lower humidity affect transpiration rate?
How does lower humidity affect transpiration rate?
Increases it
Why does bright light increase transpiration rate?
Why does bright light increase transpiration rate?
It opens stomata for photosynthesis
What is the purpose of waterproof jelly in a potometer?
What is the purpose of waterproof jelly in a potometer?
To seal joints and prevent air leaks
What is a key limitation of using a potometer?
What is a key limitation of using a potometer?
It measures uptake, not transpiration
How is the air bubble reset when it reaches the reservoir junction?
How is the air bubble reset when it reaches the reservoir junction?
Open tap, push syringe, close tap