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CAIE IGCSE Biology 8.4.3 Some Parts of a Plant May Act Questions

Practise explaining why a leaf, root or storage organ can switch between source and sink roles over time.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • Explain that an organ acts as a sink when it receives assimilates for growth, use or storage.
  • Explain that an organ acts as a source when it releases assimilates from photosynthesis or storage.
  • Describe seasonal reversal: storage organs support spring growth, then leaves supply later sinks.

CAIE IGCSE Biology 8.4.3 Some Parts of a Plant May Act Questions question 1

[Maximum number: 4]

Aphids are arthropods.
Aphids insert their mouthpieces into the phloem in the stem of a plant to feed.
An aphid is shown in Fig. 2.1.

Fig. 2.1

Fig. 2.1

magnification ×22\times 22

Fig. 2.3 shows a potato plant growing in the spring and then in the summer.

Fig. 2.3

Fig. 2.3

Explain how translocation changes between spring and summer in the potato plant shown in Fig. 2.3.

Use the terms source and sink in your answer.

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