2.42B Leaf adaptations for gas exchange
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Which leaf feature most increases the area for gas exchange inside the leaf?
(1)Total for this question: 1 mark
2(g) GAS EXCHANGE · EXAM QUESTIONS
2.42B Leaf adaptations for gas exchange
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2.42B Leaf adaptations for gas exchange
Exam question
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Describe three ways in which a leaf is adapted for gas exchange.
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Total for this question: 3 marks
2.42B Leaf adaptations for gas exchange
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Explain why most stomata are on the lower surface of a leaf.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Explain how the large surface area of a leaf helps gas exchange.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Water lilies have stomata only on the upper surface of their leaves. Suggest why.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Explain why the spongy mesophyll cells are loosely packed.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Explain why a leaf needs both a waxy cuticle and stomata.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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A leaf has 240 stomata in 1 mm² of its lower surface and 30 in 1 mm² of its upper surface. Calculate the ratio of lower to upper stomatal density.
(2)Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Describe how to count stomata on a leaf.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Suggest why plants from dry habitats often have fewer stomata.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Which feature of a leaf reduces the diffusion distance for carbon dioxide?
(1)Total for this question: 1 mark
2.42B Leaf adaptations for gas exchange
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Illustrative context: coastal dune plants.
Marram grass grows on sand dunes. Its leaves roll up in dry weather with the stomata on the inside. Explain how this affects gas exchange.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Shade leaves on the lower branches of a beech tree are thinner and wider than sun leaves at the top. Suggest how this helps the shade leaves.
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Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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A leaf has a surface area of 40 cm² and a volume of 0.8 cm³. Calculate its surface area to volume ratio.
(2):1Total for this question: 2 marks
2.42B Leaf adaptations for gas exchange
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Explain how the internal structure of a leaf is adapted for rapid diffusion of gases.
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Total for this question: 3 marks