explain how sieve tubes manage to be living
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Sieve tube elements depend on Companion cell for their activities.... ie the functions of the sieve tube elements are performed by the companion cells
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The main function of the sieve tube is transport of carbohydrates, primarily sucrose, in the plant (e.g., from the leaves to the fruits and roots). Unlike the water-conducting xylem vessel elements that are dead when mature, sieveelements are living cells. They are unique in lacking a nucleus at maturity.
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