O-LevelBiologyTransport in Plants5090/12 · Oct/Nov 2023 · Q71 Mark

The diagram shows an aphid feeding on sugar in a leaf. [Figure 7.1] When the aphid feeds, in which order do its mouthparts pass through the tissues of the leaf?

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Apalisade cells → phloem → upper epidermis

Bupper epidermis → palisade cells → phloem

Cpalisade cells → upper epidermis → xylem

Dupper epidermis → xylem → palisade cells

✓ Correct answer

B: upper epidermis → palisade cells → phloem

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Topic: Transport in Plants, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2023 Paper 1 Variant 2, question 7.

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