ScholarLab KS4 Biology Practice Exam questions 2.45B 2(g) GAS EXCHANGE · EXAM QUESTIONS 2.45B Light and net gas exchange 29 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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All · 29 Data and graphs · 5 Short answer · 20 Design an investigation · 1 Multiple choice · 2 Calculation · 1 01 Describe Data and graphs 2 marks
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. The table shows the results of an experiment with leaves in hydrogencarbonate indicator. Describe the effect of distance from the lamp on the indicator pH.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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02 Explain Data and graphs 3 marks
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. Explain the results in the table at 10 cm and in the dark.
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Total for this question: 3 marks
Lesson: 2.45B Light and net gas exchange
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03 Identify Data and graphs 1 mark
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. Using the table, identify the distance at which the leaves were closest to their compensation point.
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Total for this question: 1 mark
Lesson: 2.45B Light and net gas exchange
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04 Explain Short answer 2 marks
2.45B Light and net gas exchange
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Explain why a colorimeter or pH meter gives better results than judging indicator colour by eye.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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Plan it with CORMMSS: Design an investigation (Logic Lab) .
05 Design Design an investigation 6 marks
2.45B Light and net gas exchange
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Design an investigation to find out how light intensity affects net gas exchange in leaf discs using hydrogencarbonate indicator.
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Total for this question: 6 marks
Lesson: 2.45B Light and net gas exchange
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06 Suggest Short answer 2 marks
2.45B Light and net gas exchange
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Suggest why the tubes are rinsed with indicator before the experiment.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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07 Explain Short answer 2 marks
2.45B Light and net gas exchange
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Explain why the leaves must not touch the indicator.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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08 Suggest Short answer 2 marks
2.45B Light and net gas exchange
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Suggest one source of error in this experiment and how to reduce it.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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09 Explain Short answer 2 marks
2.45B Light and net gas exchange
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Explain why the experiment starts with all tubes the same red colour.
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Total for this question: 2 marks
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10 Predict Data and graphs 2 marks
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. Predict the result at 15 cm and explain your prediction.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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11 Explain Short answer 2 marks
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. Explain the colour in tube B.
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Total for this question: 2 marks
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12 Explain Short answer 2 marks
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. Explain why tube C stayed red.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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13 Explain Short answer 2 marks
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. Explain why tube D is needed.
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Total for this question: 2 marks
Lesson: 2.45B Light and net gas exchange
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14 Which Multiple choice 1 mark
2.45B Light and net gas exchange
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Illustrative data, not from a real investigation. In tube A, which process was faster?
(1) Choose one answer A RespirationB PhotosynthesisC TranspirationD Diffusion of indicatorShow mark scheme
Total for this question: 1 mark
Lesson: 2.45B Light and net gas exchange
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15 State Short answer 1 mark
2.45B Light and net gas exchange
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State the colour of hydrogencarbonate indicator in equilibrium with normal air.
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Total for this question: 1 mark
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