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CAIE IGCSE Biology 8.4.2 Sources & Sinks in Plants

Practise deciding which plant organs release, use or store sucrose and amino acids in a given context.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • define a source as a plant part that releases sucrose or amino acids into phloem
  • define a sink as a plant part that uses or stores sucrose or amino acids
  • use photosynthesis, growth and storage evidence to classify each labelled organ in a diagram

8.4.2—Describe: (a) sources as the parts question 1

[Maximum number: 1]

Fig. 6.1 is a diagram showing some parts of a plant. The circle shows a magnified cross-section of part of the stem.

Fig. 6.1

Fig. 6.1

State one letter from Fig. 6.1 that is a structure that is an example of a source for sucrose transport.

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