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Why is energy required for translocation of food in phloem?

Answer and explanation

Correct answer: Because dissolved sugar must be actively loaded into sieve tubes

The governing concept is pressure-flow translocation in phloem. Sugars produced at a source, usually a leaf, are actively loaded into sieve tubes using cellular energy. This lowers water potential, so water enters from nearby xylem and creates pressure. The pressure gradient helps move phloem sap toward a sink, where sugar is unloaded and used or stored. Thus option A is correct; the other choices describe unrelated or impossible processes.

Related tags

PhloemTranslocationEnergySugar-TransportLife ProcessesWorld Of LivingScienceClass 10 Mcq

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