BIOLOGY FORM 1_CELL PHYSIOLOGY_The role of diffusion in living organisms_L4

🧬 Cell Physiology – The Role of Diffusion in Living Organisms – Biology Form 1 Lesson 📊

Learn about the importance of diffusion in the survival of living organisms in this detailed Biology Form 1 lesson. Understand how diffusion facilitates essential life processes in both plants and animals.

💡 Key Topics Covered:

Definition of Diffusion: Movement of molecules from a region of high concentration to a region of low concentration

Role of Diffusion in Living Organisms:

Gas Exchange in Animals: Oxygen moves from alveoli into blood; carbon dioxide moves from blood into alveoli

Gas Exchange in Plants: Carbon dioxide diffuses into leaves for photosynthesis; oxygen diffuses out

Transport of Nutrients: Simple sugars and amino acids move into cells for metabolism

Excretion of Waste Products: Urea, carbon dioxide, and other wastes diffuse out of cells

Osmoregulation: Diffusion of water helps maintain cell turgidity and homeostasis

Practical Examples:

Oxygen absorption in lungs

Carbon dioxide release in leaves

Absorption of minerals in root hairs

Tips for answering exam questions on the role of diffusion

🎯 Who Should Watch:

Biology Form 1 students

Teachers preparing lesson materials

Learners aiming to master cell physiology and understand life processes

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Visual Infographic Concept for Quick Revision

1️⃣ Definition:

Diffusion: Movement of molecules from high → low concentration

2️⃣ Roles in Living Organisms:

Role Description Example
Gas Exchange Oxygen in, CO₂ out Alveoli in lungs
Photosynthesis CO₂ enters leaves, O₂ exits Leaf stomata
Nutrient Transport Sugars and amino acids into cells Glucose absorption
Excretion Waste removal from cells Urea and CO₂ diffusion
Osmoregulation Water balance in cells Maintaining turgidity in plant cells

3️⃣ Tips for Exams:

Relate each role to a real-life example in plants or animals

Draw labeled diagrams showing diffusion pathways

Highlight importance in maintaining homeostasis and supporting metabolism