A-Level BiologyYear 2021Q3
6 3 The diagram shows a type of potometer. graduated pipette rubber bung shoot water syringe (Source from: Science and Plants for Schools: www.saps.org.uk) The leaves of the shoot must be kept dry when assembling the potometer under water in a sink. The syringe plunger is pushed down until the water level is raised to zero in the graduated pipette. The water level in the graduated pipette is used to measure water uptake by the shoot. (a) (i) Explain why the apparatus should be assembled under water. 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(ii) Explain why the leaves must be kept dry whilst assembling the apparatus. 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Turn over 7 (b) (i) Explain how this potometer can be used to investigate the effect of light intensity on the rate of water uptake by this shoot. 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(ii) This potometer measures the uptake of water by a plant shoot. Give two reasons why the water lost by transpiration is less than the water taken up by the plant shoot. 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(Total for Question 3 = 10 marks) 8 BLANK PAGE
Paper Source:8BI0_02_que_20211016.pdf
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Exam Specification Info
This question is part of the UK A-Level Biology syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectBiology
Official MarksVariable (2–6 marks)