Tube vessels inside plant stems that transports sugars and minerals. Do not have strong walls.
Movement can be in any direction but always moves from where sugar is in abundance (sugar source) to where sugar is needed (sugar sink)
Sugar is made in photosynthesizing cells of the plant and can be polymerized and stored as starch in any cells of the plant. The sugar produced in photosynthesis is called glucose. The starch is broken down into glucose and then converted to sucrose. Sucrose is a small enough sugar that is can be transported across biological membranes. …
- American Medical Association
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