2.41B Gas exchange, respiration and photosynthesis
Exam question
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At night, which gas does a leaf take in?
(1)Total for this question: 1 mark
2(g) GAS EXCHANGE · EXAM QUESTIONS
2.41B Gas exchange, respiration and photosynthesis
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2.41B Gas exchange, respiration and photosynthesis
Exam question
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Explain why a leaf takes in carbon dioxide in bright light but gives it out in the dark.
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Total for this question: 3 marks
2.41B Gas exchange, respiration and photosynthesis
Exam question
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Explain why there is a time of day when a leaf takes in no net carbon dioxide.
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Total for this question: 2 marks
2.41B Gas exchange, respiration and photosynthesis
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State which processes in a leaf use oxygen and which produce it.
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Total for this question: 1 mark
2.41B Gas exchange, respiration and photosynthesis
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Describe how the net movement of oxygen into or out of a leaf changes from night to midday.
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Total for this question: 2 marks
2.41B Gas exchange, respiration and photosynthesis
Exam question
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Explain why respiration in leaves is hidden in bright light.
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Total for this question: 2 marks
2.41B Gas exchange, respiration and photosynthesis
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Suggest why the carbon dioxide concentration in a dense forest is highest just before dawn.
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Total for this question: 2 marks
2.41B Gas exchange, respiration and photosynthesis
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Explain why a plant kept at its compensation point cannot grow.
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Total for this question: 2 marks
2.41B Gas exchange, respiration and photosynthesis
Exam question
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Compare gas exchange in a leaf in dim light at the compensation point with gas exchange in the dark.
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Total for this question: 2 marks
2.41B Gas exchange, respiration and photosynthesis
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Identify the gas used in photosynthesis that is also produced by respiration.
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Total for this question: 1 mark
2.41B Gas exchange, respiration and photosynthesis
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A student says: "Plants photosynthesise in the day and respire at night." Explain why this statement is only partly correct.
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Total for this question: 3 marks
2.41B Gas exchange, respiration and photosynthesis
Exam question
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Compare the gases exchanged by a leaf in bright light with those exchanged by a root.
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Total for this question: 2 marks