2.23 Photosynthesis investigations
Exam question
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Why is a plant kept in the dark for 48 hours before a starch test?
(1)Total for this question: 1 mark
2(e) NUTRITION · EXAM QUESTIONS
2.23 Photosynthesis investigations
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2.23 Photosynthesis investigations
Exam question
Mark points shown after marking
Why are leaves boiled in ethanol before the iodine test?
(1)Total for this question: 1 mark
2.23 Photosynthesis investigations
Exam question
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Which part of a variegated leaf turns blue-black with iodine?
(1)Total for this question: 1 mark
2.23 Photosynthesis investigations
Exam question
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Describe how to test a leaf for starch.
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Total for this question: 4 marks
2.23 Photosynthesis investigations
Exam question
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Explain why the leaf is boiled in water first.
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Total for this question: 2 marks
2.23 Photosynthesis investigations
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Explain why the ethanol is heated in a water bath and not over a flame.
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Total for this question: 2 marks
2.23 Photosynthesis investigations
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Explain why the leaf is rinsed in water after the ethanol.
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Total for this question: 2 marks
2.23 Photosynthesis investigations
Exam question
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Describe an experiment using a destarched plant which shows that a leaf makes starch only when lit.
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Total for this question: 4 marks
2.23 Photosynthesis investigations
Exam question
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Describe how a variegated plant can be used to prove that photosynthesis requires chlorophyll.
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Total for this question: 4 marks
2.23 Photosynthesis investigations
Exam question
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Describe an experiment that proves a leaf cannot make starch without carbon dioxide.
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Total for this question: 4 marks
2.23 Photosynthesis investigations
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Explain why sodium hydroxide is placed in the flask in the carbon dioxide experiment.
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Total for this question: 2 marks
2.23 Photosynthesis investigations
Exam question
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Describe how to show that an aquatic plant produces oxygen in photosynthesis.
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Total for this question: 3 marks
2.23 Photosynthesis investigations
Exam question
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Describe how pondweed and a lamp can be used to find out how light intensity changes the photosynthesis rate.
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Total for this question: 4 marks
2.23 Photosynthesis investigations
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Explain why sodium hydrogencarbonate is added to the water in the pondweed experiment.
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Total for this question: 2 marks
2.23 Photosynthesis investigations
Exam question
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Explain why counting bubbles is a less accurate measure than collecting gas in a syringe.
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Total for this question: 2 marks