1
Q
What does a potometer measure?
Rate of water uptake, which is proportional to transpiration rate.
How is transpiration rate measured using a potometer?
By measuring distance an air bubble moves in a capillary tube over time.
Why is a potometer only an estimate of transpiration rate?
Not all water taken up is transpired; some is used in photosynthesis or maintaining cell turgor.
Why is cutting the shoot a limitation in potometer experiments?
Roots are removed, so water uptake under natural conditions is not measured
A
Bio: 3.3 Organisms exchange sub.
flashcards
Decks in class (20)
# Cards
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Exchange Between Organisms and Their Environment17
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Features of Specialised Exchange Surfaces10
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Gas Exchange in Single - Celled Organisms + Insects22
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Gas Exchange in Fish19
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Gas Exchange in the Leaf of a Plant21
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Limiting Water Loss (Insects/Plants)18
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Human Gas Exchange System + Ventilation27
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Exchange of gases in the lungs13
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Carbohydrate digestion22
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Lipid + Protein Digestion17
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Absorption of the products of digestion24
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Haemoglobin15
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Transport of oxygen by haemoglobin18
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The Human Heart Structure23
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The Cardiac Cycle19
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Blood vessels and their functions20
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Required Practical 51
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Transport of Water in the Xylem29
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Transport of organic substances in the phloem19
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Investigating transport in Plants7
