Which cell type(s) is/are dead at maturity? Select one: xylem and phloem xylem collenchyma phloem and collenchyma

Which cell type(s) is/are dead at maturity?
Select one:
xylem and phloem
xylem
collenchyma
phloem and collenchyma

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Answer

• xylem and phloem
  Explanation:
  Phloem is a supportive cell type that functions to transport sugars and also providing mechanical support to the plants. Phloem cells have secondary cell wall and dead at maturity. Xylem has two cell types, tracheids and vessel elements which have thick lignified secondary walls and hence dead at maturity.