O-LevelBiologyTransport in Plants5090/12 · May/June 2016 · Q121 Mark

What is the main cause of water moving up to the leaves in xylem vessels?

Aactive transport

Bevaporation from the epidermis of the leaf

Cevaporation from the walls of the mesophyll cells

Duse of water in photosynthesis

✓ Correct answer

C: evaporation from the walls of the mesophyll cells

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Topic: Transport in Plants, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 2, question 12.

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