Sucrose Loading Mechanism in Phloem

Steps:

• Identify the process: Sucrose moves from mesophyll to companion cells, then to sieve tubes.
• Recall symplastic/apoplastic pathways: Sucrose enters companion cells actively, creating concentration gradient.
• Sequence events: Proton pumps energize transport, sucrose follows, water enters for pressure flow.
• Match order: Start with gradient setup, then active loading, water influx, flow initiation.

Not enough information: Statements 1–4 not provided, preventing precise order verification.

Final answer: Not enough information.