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Cambridge IGCSE Biology practice

Paper 4 structured question: Transpiration

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4

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3

Marks

Topic

Transpiration

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Paper 4Theory (Extended)3 marks

Understanding water vapor loss in leaves

Diagram Description

Leaf internal structure

A diagram shows mesophyll cells separated by air spaces inside a leaf, with stomata on the leaf surface.

  1. a

    Explain how the large internal surface area from the air spaces between mesophyll cells is connected to water vapor loss from the leaf.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Transpiration

Paper 4Theory (Extended)3 marks

Description

Stomata characteristics

Stomata are pores on the leaf surface that can vary in size and number between different plants.

  1. a

    Explain how the size and number of stomata affect the loss of water vapor from a leaf.

    Aim for approximately 3 distinct marking points.

    [3]