Lesson Plan

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Lesson Plan
Grade: Date: 18/01/2026
Subject: Biology
Lesson Topic: Explain the role of enzymes in digestion with reference to amylase, protease and lipase.
Learning Objective/s:
  • Describe the specific function of amylase, protease and lipase in the digestive process.
  • Explain where each enzyme is produced and its optimal pH range.
  • Analyse how temperature, pH and inhibitors influence enzyme activity.
  • Interpret the step‑by‑step digestion pathway showing where each enzyme acts.
  • Apply knowledge to identify potential enzyme‑related digestive problems.
Materials Needed:
  • Projector and screen
  • PowerPoint slides with enzyme diagrams
  • Handouts summarising enzyme properties
  • Whiteboard and markers
  • Sample foods (bread, meat, oil) for a brief demonstration
  • Worksheet activity sheets
 Introduction:
Begin with a short video clip showing chewing and the mouth’s role in digestion to hook interest. Ask students what they already know about “digestive juices” and record ideas on the board. Explain that today they will discover how three key enzymes break down carbohydrates, proteins and fats, and outline the success criteria: identify each enzyme’s site, substrate and optimal conditions.
Lesson Structure:
  1. Do‑now quiz on basic digestion terms (5 minutes).
  2. Mini‑lecture on enzyme function, production sites and optimal pH (10 minutes).
  3. Interactive matching activity: students pair enzymes with substrate, products and pH using handouts (10 minutes).
  4. Demonstration: iodine test on bread to visualise amylase activity before and after chewing (5 minutes).
  5. Group discussion of factors affecting enzyme activity (temperature, pH, inhibitors) using case scenarios (8 minutes).
  6. Flow‑chart completion: students map the digestion process, placing each enzyme in the correct stage (7 minutes).
  7. Exit ticket: write one concise sentence summarising the role of each enzyme (5 minutes).
Conclusion:
Recap the three enzymes, their sites of action and why optimal conditions matter. Collect exit tickets to gauge understanding and address any misconceptions. Assign homework: students create a labelled diagram of the alimentary canal highlighting where amylase, protease and lipase act, and bring it to the next lesson.