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Edexcel A-Level Biology AS 4.5 Sclerenchyma Xylem and Phloem Questions

Identify xylem, phloem or sclerenchyma from labelled plant sections, then link each tissue's structure to water, solute transport or mechanical support.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • identify xylem, phloem or sclerenchyma from labelled plant sections and tissue features
  • compare xylem and phloem functions using water, inorganic ions and organic solute transport
  • describe sclerenchyma fibres as lignified, thick-walled cells that strengthen plant stems

Edexcel A-Level Biology AS 4.5 Sclerenchyma Xylem and Phloem Questions question 1

[Maximum number: 2]

Fibres from the stems of hemp plants are widely used in industry for their great tensile strength.

The relationship between tensile strength and fibre diameter was investigated.
The photograph shows a cross section of a part of a hemp fibre and an eyepiece graticule. The fibre bundle is made up of pith cells, some of which are shown here.

Figure for Question Edexcel A-Level Biology AS 4.5 Sclerenchyma Xylem and Phloem Questions question 1 — Edexcel A-Level Biology AS

Name the two types of tissue found in fibres from plant stems.

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