Question

Write component cells of phloem.​

Answer 1

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Phloem is made up of following four types of elements​

• Sieve tubes:- These are tubular cells with end walls perforated by numerous pores called sieve plates. They lack nucleus. ​

• Companion cells:- These are thin and small elongated cells.
  They have dense cytoplasm and
  prominent nucleus.They control activities of
  sieve tubes.​

• Phloem parenchyma:- These are thin-walled living parenchymatous cells.​

• Phloem fibres:- These are thick-walled, elongated, dead, sclerenchyma cells.