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According to the pressure-flow hypothesis, why must sieve-tube elements in phloem be living cells?

According to the pressure-flow hypothesis, why must sieve-tube elements in phloem be living cells?
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According to the pressure-flow hypothesis, why must sieve-tube elements in phloem be living cells?

User William Jackson
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Base from the pressure-flow hypothesis, the sieve tube in the phloem should be living cells because sugars are transported across the membranes by the active transport which needs ATP that is produced during respiration. Hope this helps.
User Marguerite
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