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Cambridge IGCSE Biology practice

Paper 4 structured question: Transpiration

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Transpiration

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Paper 4Theory (Extended)3 marks

Factors affecting water vapor loss from leaves

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]

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Paper 4 structured question: Transpiration

Paper 4Theory (Extended)3 marks

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]