GCSE Combined Science (AQA)

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Xylem

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Organisation Plant Tissues, Organs and Systems

Xylem

1:46 Xylem, Phloem and Meristem Tissue
Spec 4.2.3.1 4.2.3.2 4.1.1.3
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  • Xylem tissue is located in the roots, stem, and leaves of plants, forming part of the transport system.
  • A diagram shows a cross-section of a stem with xylem tissue in red, distributed in bundles.
  • Water and mineral ions, such as magnesium, are absorbed from the soil into the plant through the roots.
  • These substances are transported upwards for use in photosynthesis and growth.
  • Xylem tissue transports water and minerals in one direction, from the roots to the stems and leaves.
  • Xylem is composed of dead cells that have lost their end walls, creating a hollow tube structure.
  • The cells are reinforced with lignin, a stiff and strong polymer, which is the main component of wood.
  • This structure allows the xylem to efficiently transport water and minerals up the plant.
  • For exams, it's important to understand that xylem is a lignin-strengthened hollow tube that facilitates upward water movement.

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