This resource is a fully planned lesson presentation covering key content from AQA GCSE Biology B3, bringing together organisation, digestion, and enzymes as biological catalysts.

Students learn how the digestive system works as an organ system, how enzymes catalyse reactions to break down food, and how temperature and pH affect enzyme activity. The lesson also includes the required practical: food tests, alongside rate of reaction calculations to develop core maths skills.

Includes 31 slides of varied tasks designed to support differentiation, targeted intervention, and addressing specific gaps in exam knowledge.

Activities include:
Definitions of tissue, organ and organ system
Identifying tissues found in the stomach and their functions
Explaining how enzymes act as biological catalysts
The lock-and-key model of enzyme action
Interpreting enzyme activity vs temperature and pH graphs
Explaining optimum conditions and denaturation
Required practical: food tests for starch, sugars, lipids and protein (including positive results)
Calculating and comparing rates of reaction (amount ÷ time)
Applying maths skills (MS 1a, MS 1c)
A structured 6-mark exam-style question
Retrieval and exam-focused questioning throughout

What’s included:

✔ Lesson presentation (PDF)
✔ Student tasks and exam-style questions
✔ Full AQA-style mark scheme
✔ Model answers and clear mark points

How to use this resource
The lesson presentation is provided as a PDF.
To use it as a slideshow in class:
Open the PDF on your computer or Chromebook
Select Full Screen / Presentation mode
Use the arrow keys or space bar to move through slides
No PowerPoint or additional software is required.

Perfect for:
AQA GCSE Biology (B3), KS4 teaching, revision lessons, required practical revision, cover work, homework, or independent learning.