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9.2.11 Translocation Study Guide Part 1: Read for Understanding Instructions: Read pages 254-256, and then address the learning objective below. • 9.2.11 Ouline the Role of Phloem in Active Translocation of Sugars (sucrose) and amino acids from source (photosynthetic tissue to storage organs) to sinks (fruits, seeds, roots) Part 2: Guided Notes Instructions: Open the 9.2.11 Translocation PowerPoint Notes on the IB2 Biology Moodle Page, and fill in the blanks • Movement from Source to Sink – A process of moves sugars through a plant from a source to a sink. – A is any cell in which sugars are produced by photosynthesis. – A is any cell where the sugars are used or stored (fruits, roots, seeds). • Vascular Tissue: PHLOEM Tissue – Phloem Cells are . – lacks nucleus & cytoplasm – Sieve tube elements are connected to each other via . – Sieve plates have holes which allow movement of water and dissolved organics molecules – has nucleus and dense cytoplasm – Companion cells are attached to sieve tube element via . • Phloem Translocation Summary • 1. moves the organic molecules (sugars, amino acids) from their through the tube system of the phloem to the . Phloem vessels still have cross walls called sieve plates that contain pores. • 2. actively (active transport) load sucrose (soluble, not metabolically active) into the phloem. • 3. Water follows the high solute in the phloem by .A positive pressure potential develops moving the mass of phloem sap forward. • 4. The sap must cross the . Current hypothesis do not account for this feature. • 5. The phloem still contains a small amount of cytoplasm along the walls but the organelle content is greatly reduced. • 6. actively unload (ATP used) the organic molecules • 7. are stored (sucrose as starch, insoluble) at the sink. Water is released and recycled in xylem. Translocation in Greater Detail STEP 1 • Sugars produced during photosynthesis ( ) are actively (using ATP) pumped into the . • This loading of sugar is accomplish by . STEP 2 • As sugar concentrations increase in the sieve tubes, water from the xylem moves into the sieve tube by . STEP 3 • This movement of water causes a results in • This movement does not require energy. STEP 4 • The tube at the sink. • This removal of sugar is accomplished via to build up in the sieve tube that . by the removal of sugar from the sieve . • The sugar is converted into in insoluble and exerts . STEP 5 • Xylem the the relatively pure water by carrying it from . Summary of Transport in Plants • 1. Source produces . • 2. Glucose from photosynthesis produced • 3.Glucose converted to for transport • 4. actively loads the sucrose • 5. Water follows from xylem by . • 6. Sap volume and to give Mass flow • 7. Unload the organic molecules by the • 8. Sucrose stored as the . • 9. Water that is released is picked up by the . • 10. water recycles as part of transpiration to re supply the sucrose loading Part 4 Practice Questions . Part 3: 9.2.11 Practice Questions