Why is phloem transport described as an active process while xylem transport is largely passive?

Type: MCQ • Marks: 1

A. Phloem uses wind power

B. Phloem loading/unloading requires metabolic energy (ATP), whereas xylem sap movement is driven by physical forces

C. Xylem requires ATP

D. Neither process involves water

Explanation

Phloem loading uses cell energy (ATP), whereas xylem transport relies on physical evaporation (transpiration pull) and capillary forces.

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