3.6B Transpiration
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What is transpiration?
(1)Total for this question: 1 mark
3(h) TRANSPORT · EXAM QUESTIONS
3.6B Transpiration
14 exam-style questions · Biology only (B): not in Science (Double Award). Write your answer, check it against the mark scheme and tick the points you earned. Your marks stay on this device. Your writing is not saved.
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3.6B Transpiration
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Describe how water is lost from a leaf by transpiration.
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Total for this question: 3 marks
3.6B Transpiration
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Explain how transpiration causes water to move up the xylem.
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Total for this question: 2 marks
3.6B Transpiration
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State two benefits to a plant of the transpiration stream.
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Total for this question: 2 marks
3.6B Transpiration
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Explain why most transpiration happens through the lower surface of a leaf.
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Total for this question: 2 marks
3.6B Transpiration
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Mass lost by leaves after 24 hours Treatment Mass lost / g no grease 0.80 grease on upper surface 0.72 grease on lower surface 0.15 grease on both surfaces 0.04 Illustrative data, not from a real investigation. Petroleum jelly blocks stomata. Explain the results in the table.
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Total for this question: 3 marks
3.6B Transpiration
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Mass lost by leaves after 24 hours Treatment Mass lost / g no grease 0.80 grease on upper surface 0.72 grease on lower surface 0.15 grease on both surfaces 0.04 Illustrative data, not from a real investigation. Calculate the percentage of water lost through the lower surface of the leaf with no grease.
(2)%Total for this question: 2 marks
3.6B Transpiration
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Explain why a plant in very dry air may close its stomata.
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Total for this question: 2 marks
3.6B Transpiration
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Explain why closing stomata can cause a leaf to overheat.
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Total for this question: 2 marks
3.6B Transpiration
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Describe how a potometer measures the rate of water uptake.
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Total for this question: 2 marks
3.6B Transpiration
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A potometer measures water uptake rather than transpiration. Why?
(1)Total for this question: 1 mark
3.6B Transpiration
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Explain why the shoot must be cut and fitted to the potometer under water.
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Total for this question: 3 marks
3.6B Transpiration
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Illustrative context: desert plants.
Suggest why a cactus has spines instead of leaves.
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Total for this question: 2 marks
3.6B Transpiration
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Explain why water uptake by a plant is greater at midday than at midnight.
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Total for this question: 2 marks