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CAIE IGCSE Biology 8.4 Translocation, Sources & Sinks

Practise translocation questions on sucrose and amino acid movement in phloem, source-sink decisions, seasonal organ roles and girdling evidence.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • define translocation as phloem movement of sucrose and amino acids from source to sink
  • identify leaves, tubers, flowers or growing tissues as sources or sinks in plant contexts
  • use girdling or radioactive-carbon evidence to infer phloem transport direction

Covered syllabus points

8.4.1—Translocation as the movement8.4.2—Describe: (a) sources as the parts8.4.3—Some parts of a plant may act

8.4 Translocation question 1

[Maximum number: 2]

Question (a)

(a)

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

[ 2 ]

Question (i)

(i)

State the name of the process that describes the transport of sucrose in a plant.

[ 1 ]

Question (ii)

(ii)

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

[ 1 ]

8.4 Translocation question 2

[Maximum number: 2]

Explain why some parts of a plant can act as both a source and a sink.

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