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Discuss how certain parts of a plant can function as both sources and sinks at different times depending on their physiological state.

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Cambridge IGCSE BiologyTransport in plantsSupplement content

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Quick explanation

Discuss how certain parts of a plant can function as both sources and sinks at different times depending on their physiological state

  • This point belongs to Translocation, especially Translocation outcomes.
  • You need to be able to discuss how certain parts of a plant can function as both sources and sinks at different times depending on their physiological state.
  • The key ideas to know are Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Explain

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This objective helps connect Translocation outcomes to exam-style questions, flashcards, and revision notes for Translocation.

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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]
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