Summary

• Description:

  The PDF document comprises Form 1 Biology Cell Physiology Notes.

  The topics and sub-topics covered in the document include:

  • Introduction to Cell Physiology
    • Definition of cell physiology as the study of processes involving the movement of substances across the cell membrane.
    • A detailed look at the structure of the cell membrane, including the phospholipid bilayer and protein layers.
    • Key properties of the cell membrane, such as semi-permeability, polarity, and its sensitivity to changes in temperature and pH.
  • Physiological Processes
    • Diffusion: Defined as the movement of molecules from a region of high to low concentration. The notes cover factors affecting diffusion (concentration gradient, temperature, molecule size, etc.) and its role in living organisms like gaseous exchange and excretion.
    • Osmosis: Explained as a special type of diffusion involving the movement of water molecules across a semi-permeable membrane. Factors influencing osmosis and its importance in both plants and animals are discussed.
    • Active Transport: The movement of substances against a concentration gradient, which requires energy from respiration. The document details the factors affecting this process and its vital roles, such as the absorption of mineral salts by plant roots.
  • Water Relations in Plant and Animal Cells
    • Explanation of solution types: hypotonic, hypertonic, and isotonic.
    • Concepts of osmotic pressure and turgor pressure in plant cells.
    • Processes like plasmolysis (cell shrinking in hypertonic solutions) and wilting in plants.
    • Effects on animal cells, such as haemolysis (bursting) in hypotonic solutions and crenation (shrinking) in hypertonic solutions.
  • Practical Activities
    • Step-by-step procedures for experiments demonstrating key physiological processes.
    • Activities include demonstrating diffusion using potassium permanganate, showing osmosis with a Visking tubing and living tissue (potato), and observing plasmolysis in onion epidermal cells.

  These notes are comprehensive, neat, and printable, making them an excellent resource for students studying the fundamental processes of cell function. They are also highly suitable for teachers to use for lesson preparation, providing clear explanations, diagrams, and practical lab guides to reinforce learning.

• File Size:

  273.93 KB
• Length:

  10 pages
• Category:

  Lesson Notes
• Level:

  Form 1
• Subject:

  BIOLOGY
• Posted By:

  Caleb_Peter

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