A-LevelBiologyTransport in plants9700/12 · Feb/Mar 2022 · Q261 Mark

The diagram shows the relationship between phloem sieve tube elements, xylem vessel elements and companion cells. Which row correctly identifies what could be represented by the numbers 1, 2, 3, 4 and 5? [Figure 26.1]

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Acompanion cells endoplasmic reticulum phloem sieve tube elements no nucleus xylem vessel elements

Bcompanion cells nucleus phloem sieve tube elements cytoplasm xylem vessel elements

Cphloem sieve tube elements mitochondria companion cells nucleus xylem vessel elements

Dxylem vessel elements no cytoplasm phloem sieve tube elements vacuole companion cells

✓ Correct answer

A: companion cells endoplasmic reticulum phloem sieve tube elements no nucleus xylem vessel elements

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2022 Paper 1 Variant 2, question 26.

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