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Biology 2 - C05 - 03

🧬📗1️⃣ Module 5 - Xylem, Phloem & Plant Transport - SET 3

QuestionAnswer
Xylem Vascular tissue transporting water and minerals from roots to leaves.
Phloem Vascular tissue transporting sugars from source to sink.
Vessel elements Wide xylem cells with perforation plates; dead at maturity.
Tracheids Narrow xylem cells providing support and water transport.
Root hairs Increase surface area for water and mineral absorption.
Aquaporins Membrane channels that speed water movement across membranes.
Root pressure Positive pressure pushing water upward when transpiration is low.
Guttation Liquid water exuded from leaf margins due to high root pressure.
Transpiration pull Evaporation from leaves creates negative pressure pulling water upward.
Cohesion Water molecules stick together via hydrogen bonds.
Adhesion Water molecules stick to xylem walls.
Capillary action Upward movement of water due to cohesion + adhesion.
Source Organ producing sugars (e.g., leaves).
Sink Organ using or storing sugars (e.g., roots, fruits).
Phloem loading Active transport of sucrose into sieve tubes via companion cells.
Pressure-flow mechanism High osmotic pressure pushes phloem sap from source to sink.
Phloem unloading Sugars exit sieve tubes at sink tissues for use or storage.
Apoplast route Movement through cell walls and spaces without crossing membranes.
Symplast route Movement through cytoplasm via plasmodesmata.
Transmembrane route Movement across multiple membranes; highest control.
Created by: francisslavin002
 

 



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