KS3 Biology — Bacteria in the Digestive System — Full Worksheet

🦠 Build deep understanding of bacteria in the digestive system with this complete, no-prep 100-mark worksheet — ready to use for lessons, homework, or revision. Bacteria are unicellular microorganisms, and while some cause disease, others such as gut flora are essential for digestion and health, and this resource covers it in depth for KS3 students aged 11–14.

📦 What's included:

Structured across three sections of progressive difficulty:

Section 1 (30 marks) — bacterial structure, key vocabulary, pathogenic and helpful bacteria, gut flora, and the role of antibiotics through multiple choice, a true/false table, and a 10-gap fill-in-the-blank passage

Section 2 (40 marks) — definition writing for core terms including microorganism, pathogen, enzyme, and competition; short answer questions on the three jobs of gut bacteria and why the body cannot digest all food alone; a table comparing helpful and harmful bacteria with examples; and an extended evaluation of whether antibiotics are always beneficial

Section 3 (30 marks) — scenario-based extended writing on antibiotic recovery and gut flora restoration, a balanced argument question on whether humans could survive without bacteria, and a two-part case study applying gut bacteria knowledge to a real-world digestive health scenario

Full answer key with detailed marking guidance included.

🎬 Watch the free video lesson: https://www.youtube.com/watch?v=LUK9uywIB_g

👩‍🏫 Google Classroom ready — copy the link straight into your assignment. Print as many copies as your class needs.

🔓 Also available as part of the Complete Lesson Pack, bundled with extension activities. Save £1 buying the pack (£3 + £3 = £6 separately, £5 together).

Price: £3