IGCSEBiology: Double ScienceEdexcelRevision Notes2. Structure & Function in Living OrganismsTransport Systems2.53 Role of the Phloem

Role of the Phloem (Edexcel IGCSE Biology: Double Science)

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Phloem

Structure and function of the phloem

  • Phloem vessels transport food materials (mainly sucrose and amino acids) made by the plant from photosynthesising leaves to non-photosynthesising regions in the roots and stem (pronounced: flow-em)
    • This means that movement can be in any direction around the plant

  • The phloem has structural features different to the xylem
    • The cells are living cells and are not hollow
    • Substances move from cell to cell through pores in the end walls of each cell

Vascular tissue in a dicotyledonous plant, IGCSE & GCSE Biology revision notes

The position of the xylem and phloem in the stem compared to the root

Exam Tip

If you are asked to identify the xylem or phloem in a diagram showing a cross-section of a root, stem or leaf just remember that xylem is always on the inside and phloem is always on the outside.

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    Lára

    Author: Lára

    Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.