In the centre to provide support for the root as it pushes through the soil.
3 of 12
Where are the xylem and phloem in the stems of a plant? Why?
Near the outside to provide a 'scaffolding' that reduces bending.
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Where are the xylem and phloem in a leaf? Why?
They make up a network of veins which support the thin leaves.
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What are xylem vessels?
Long, tube-like structures formed from cells joined end to end.
6 of 12
Name 3 features of a xylem vessel.
Has no end walls which allows water to pass up through the middle easily. The cells are dead so they contain no cytoplasm. There walls are thickened with lignin for support to stop them collapsing inwards.
7 of 12
What is phloem tissue?
A transport tissue formed from cells arranged in tubes.
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What are seive tube elements?
They are living cells in phloem tissue that form the tube for transporting substances. They are joined end to end to form sieve tubes which have lots of holes in them to allow solutes to pass through.
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What is unusual about sieve tube elements?
They have no nucleus, a thin layer of cytoplams and few organelles.
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What are companion cells?
They are in phloem tissue and they carry out the living functions for both themselves and their sieve cells.
11 of 12
Name one thing companion cells do.
Provide the energy for the active transport of solutes.
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Other cards in this set
Card 2
Front
What does phloem tissue transport?
Back
Dissolved substances like sugars
Card 3
Front
Where are the xylem and phloem in a root? Why?
Back
Card 4
Front
Where are the xylem and phloem in the stems of a plant? Why?
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