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Plant Tissue definitions

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  • Primary Cell Wall
    Outermost, thin, and flexible layer in plant cells, mainly composed of cellulose, hemicellulose, and pectin, allowing for cell growth and expansion.
  • Secondary Cell Wall
    Thicker, rigid inner layer formed after growth, rich in cellulose and lignin, providing extra strength and restricting further expansion.
  • Cellulose Microfibrils
    Long, strong chains of glucose molecules bundled together, forming the main structural framework in plant cell walls.
  • Hemicellulose
    Polysaccharide that binds cellulose fibers together, enhancing wall strength and flexibility in both primary and secondary cell walls.
  • Pectin
    Branched polysaccharide forming a gel-like matrix in the primary wall and middle lamella, crucial for flexibility and cell adhesion.
  • Lignin
    Complex polymer found in secondary walls, waterproofing and reinforcing plant tissues, especially in woody structures.
  • Middle Lamella
    Pectin-rich layer between adjacent plant cells, acting as a glue to maintain tissue integrity and adhesion.
  • Turgor Pressure
    Internal water pressure within plant cells, maintained by the cell wall, essential for cell rigidity and preventing wilting.
  • Osmotic Pressure
    Force generated by water movement across membranes, regulated by the cell wall to support plant structure and hydration.
  • Plasmodesmata
    Specialized channels traversing cell walls, enabling direct exchange of materials and signals between neighboring plant cells.
  • Polysaccharide
    Large carbohydrate molecule made of many sugar units, forming key components like cellulose, hemicellulose, and pectin in cell walls.
  • Structural Support
    Mechanical reinforcement provided by cell wall components, allowing plants to maintain shape and withstand external forces.
  • Cell Shape
    Distinct geometric form maintained by the cell wall, crucial for plant tissue organization and function.
  • Matrix
    Gel-like substance, mainly of pectin, embedding cellulose and hemicellulose fibers in the primary cell wall for flexibility.