Loading and unloading of sucrose into phloem is which type of transport
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(C) Phloem unloading is a passive transport mechanism from the sieve tubes to the cells at the root tip. It takes place passively down a concentration gradient of sucrose. The transfer cells are often present at unloading sites.
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Phloem unloading is a passive transport mechanism from the sieve tubes to the cells at the root tip. It takes place passively down a concentration gradient of sucrose. ... Phloem unloading also requires metabolic energy, that is used by sink organs for respiration and biosynthetic reactions.
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