A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2009 · Q261 Mark
Which description states some of the features of xylem vessels?
Acells joined to form a tube, pits at intervals, sieve plates between cells, surrounded by the
endodermis in roots
Bcontains cells joined end to end, containing peripheral cytoplasm, cell walls with secondary
thickening of lignin, located to the outside of phloem in vascular bundles
Ccontains elongated cells with end walls broken down, located in vascular bundles in the stem
and centrally in the roots
Ddead elongated cells, lignified cell walls with pits at intervals, associated with companion
cells in the roots only
✓ Correct answer
C: contains elongated cells with end walls broken down, located in vascular bundles in the stem and centrally in the roots
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