Except for phloem fibres, all other phloem cells (sieve cells, sieve tubes, companion cells, and phloem parenchyma) are living cells.
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The main function of phloem is to transport food from the leaves to other parts of the plant.
The five types of cells that make up the phloem are sieve cells, sieve tubes, companion cells, phloem fibres, and phloem parenchyma.