Cambridge IGCSE Biology practice

Paper 4 structured question: Xylem and phloem

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Paper

Marks

Topic

Xylem and phloem

Exam-style question

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Paper 4Theory (Extended)2 marks

Xylem vessels transport water efficiently due to their specialized structure.

Description

Xylem vessels have thick lignified walls, lack cell contents, and are arranged end to end without cross walls.

a
State why the absence of cell contents is important for xylem vessel function.
Your answer
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[1]
b
Identify the function of the thick lignified walls in xylem vessels.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 4Theory (Extended)3 marks

Diagram Description

The diagram shows xylem vessels with thick walls, no cell contents, and cells joined end to end without cross walls.

a
State one way in which the thick lignified walls of xylem vessels help their function.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify two structural features of xylem vessels that allow continuous water flow.
Your answer
Aim for approximately 2 distinct marking points.
[2]