Which means of transport occurs when sugar is loaded in phloem at the source?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Active transport is the mechanism by which sugars (primarily sucrose) are loaded into phloem sieve tube elements at the source. This process:
- Requires metabolic energy (ATP)
- Moves sugars against their concentration gradient
- Involves proton pumps and sucrose-H⁺ cotransporters in companion cells
Evidence: Metabolic inhibitors (e.g., cyanide) that block ATP production prevent sugar loading.
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