# Describe the role of xylem vessels in the transport of water through a flowering plant, including the features of xylem that make them well suited to this function.

> Pearson Edexcel International GCSE Biology (4BI1) — 2.10 Transport: flowering plants · Describe · 4 marks

## Mark scheme (4 marks)

1. Xylem transports water (and mineral ions) from the roots to the leaves / shoots (upwards through the plant).
2. Xylem vessels are hollow / have no cytoplasm, forming a continuous tube that allows unobstructed flow of water.
3. Xylem vessel walls are strengthened with lignin, which supports the plant and prevents the vessels from collapsing under the tension of the water column.
4. Water moves up the xylem because of transpiration / water is lost from leaves by evaporation through stomata, creating a 'pull' / tension that draws water up.

## Key terms

- [xylem](https://www.gradenine.co.uk/glossary/xylem)

## Related

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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-the-role-of-xylem-vessels-10551e2e) · Published by Druglandscape Ltd.