Answer:
Phloem is a complex permanent tissue. It is
made up of four types of elements: sieve tubes, companion cells, phloem fibres
and the phloem parenchyma. Sieve tubes are tubular cells with perforated walls.
Phloem transports food from leaves to other parts of the plant. Except for
phloem fibres, all the phloem cells are living.
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