Answer:
(b) Tracheids and vessels are xylem elements and are
concerned with the transport of water. They are long tube-like structures with
partially or completely dissolved walls to form water pipes (in vessels) and
pits in cell wall (in tracheids) for conducting water.
Sieve tubes are slender tube-like structures with their
end walls perforated by numerous pores and are called sieve plates. They are
phloem elements and are main food conducting elements. Companion cells possess
numerous mitochondria and ribosomes and are supporting units of sieve tubes.
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