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Which among the following statement is true? 

A. All xylem cells are living except tracheids. 

B. All phloem cells are living except sieve tubes 

C. All xylem cells are dead cells except xylem parenchyma. 

D. All phloem cells are dead cells except phloem ibres.

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Xylem parenchyma is the only living component of the xylem tissue whereas phloem sclerenchyma is the only dead component of phloem. Therefore, option (c) is true.

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