Which description of xylem vessel elements is correct?
1 )
cells joined to form a tube, pits at intervals, sieve plates between cells, surrounded by the endodermis in roots
2 )
contains cells joined end to end, containing cytoplasm, cell walls with lignin, located to the outside of phloem in vascular bundles
contains elongated cells with end walls broken down, located in vascular bundles in the stem and leaves
4 )
dead elongated cells, lignified cell walls with pits at intervals, associated with companion cells in the roots only
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