Summary

• Description:

  The PDF document comprises Form 2 Biology notes on Transport in Plants and Animals.

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

  • Introduction to Transport
    • Definition of transport as the movement of substances within an organism.
    • The necessity of a transport system in large multicellular organisms, as diffusion alone is insufficient.
  • Transport in Plants
    • The role of vascular bundles (xylem and phloem) as the transport system in higher plants. Xylem transports water and minerals, while phloem transports manufactured food.
    • Internal Structures: Detailed descriptions of the internal structures of roots and stems, including the functions of the piliferous layer, root hairs, cortex, and vascular tissues.
    • Absorption and Movement of Water: The process of water moving from the soil into root hairs via osmosis and continuing into the xylem vessels. Mineral salts are absorbed through diffusion and active transport.
    • Transpiration: The loss of water vapor from plants through stomata, cuticle, and lenticels. The forces involved, such as transpiration pull, cohesion, adhesion, and root pressure, are also explained.
    • Factors Affecting Transpiration: A review of environmental factors (temperature, humidity, wind, light) and structural adaptations (cuticle thickness, stomata distribution) that influence the rate of transpiration.
    • Translocation: The transport of soluble organic food substances through the phloem's sieve tubes, assisted by companion cells.
  • Transport in Animals
    • Circulatory Systems: An overview of open circulatory systems (as seen in insects) and closed circulatory systems (as found in vertebrates).
    • Mammalian Circulatory System: A detailed examination of the double circulation system (pulmonary and systemic).
    • The Heart: The structure of the four-chambered heart, the path of blood flow through it, the pumping mechanism (systole and diastole), and the myogenic nature of the heartbeat.
    • Blood Vessels: The structure and function of arteries, veins, and capillaries.
    • Circulatory Diseases: Descriptions of common conditions like thrombosis, arteriosclerosis, and varicose veins.
  • Blood and Immunity
    • Composition of Blood: The roles of plasma, erythrocytes (red blood cells) for oxygen transport via hemoglobin, leucocytes (white blood cells) for defense, and platelets for blood clotting.
    • Blood Groups: Explanation of the ABO blood group system and the Rhesus (Rh) factor, including their importance in blood transfusions.
    • The Lymphatic System: Its role in draining excess tissue fluid (lymph) back into the circulatory system.
    • Immunity: The body's immune response, including the roles of antigens and antibodies, the different types of immunity (natural and artificial), and the importance of vaccination.

  These notes are comprehensive, neat, and printable, making them an excellent resource for students studying the topic of transport in living organisms. They are also highly suitable for teachers to use for lesson preparation, providing a structured and clear foundation with detailed explanations.

• File Size:

  437.92 KB
• Length:

  26 pages
• Category:

  Lesson Notes
• Level:

  Form 2
• Subject:

  BIOLOGY
• Posted By:

  Caleb_Peter

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