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Cambridge IGCSE Biology practice

Paper 4 structured question: Translocation

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Translocation

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Paper 4Theory (Extended)3 marks

Source and sink dynamics in storage organs

Description

Role of a Tuber in Sugar Transport

A tuber stores sugars during the growing season and later releases sugars to support new growth in spring.

  1. a

    Explain how a tuber can act as both a sink and a source at different times.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Translocation

Paper 4Theory (Extended)2 marks

Description

Source and Sink Roles in Plant Parts

A young leaf is growing and cannot photosynthesize enough sugars. A mature leaf is fully photosynthetic. A tuber stores sugars during the growing season and releases sugars during sprouting.

  1. a

    Explain why a young leaf acts as a sink while a mature leaf acts as a source.

    Aim for approximately 2 distinct marking points.

    [2]