Digestive Enzymes and How They Work - KS3 Biology Worksheet

A complete, no-prep 100-mark worksheet on digestive enzymes — ready to use for lessons, homework, or revision with KS3 Biology students aged 11-14.

Digestive enzymes are biological catalysts, made in the mouth, stomach, pancreas and small intestine, that break large food molecules into small ones the body can absorb.

📝 Structured across three sections of progressive difficulty: Section 1 (30 marks) covers five multiple choice questions, a ten-statement true or false table and a ten-gap word-bank summary. Section 2 (40 marks) builds understanding through key-term definitions, a completion table and written answers on the lock and key model, where each catalyst is made and why starch digestion pauses in the stomach. Section 3 (30 marks) challenges students with extended answers on denaturing, biological washing powder and predicting optimum temperature and pH. A full answer key with detailed marking guidance is included. Comes as a PDF and an editable Word file (DOCX).

Full lesson page with the video, quiz and free worksheet: https://inewittall.com/ks3-biology/digestive-enzymes/?utm_source=payhip&utm_medium=listing

Watch the full lesson on YouTube: https://youtu.be/z2yYPx7Sq94

⭐ Also available: a companion extension pack with four enrichment activities, or save £1 with the complete lesson bundle.

TAGS: KS3 Biology, Enzymes, Digestive Enzymes, Digestion, Worksheet, 100 Marks, Lock and Key, Denaturing, pH, Temperature, Answers Included, Revision, Homework, Year 7, Year 8

PRICE: £3

KEY STAGE: KS3

SUBJECT: Biology

FORMAT: PDF + DOCX (editable Word file)