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Unit 1: Section 6: Transport in plants
Xylem and Phloem
Be able to explain the need for transport systems in multicellular plants in terms
of size and surface area: volume ratio.
Be able to describe, with the aid of diagrams and photographs, the distribution of
xylem and phloem tissue in…

Page 2

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The xylem and phloem are arranged towards the outside of the stem. This is because the
vascular bundles, along with associated sclerenchyma, not only transport material but
also provide support in herbaceous stems. Being discontinuous, this ring of supporting
tissues allows the stem to be flexible and to bend in…


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