KS3 Biology — Breathing, Respiration and Gas Exchange — Full Worksheet

🫁 Build deep understanding of breathing, respiration and gas exchange with this complete, no-prep 100-mark worksheet — ready to use for lessons, homework, or revision. Breathing moves air in and out of the lungs, gas exchange swaps oxygen and carbon dioxide between the air sacs and the blood, and cellular respiration releases energy inside mitochondria, and this resource covers all three in depth for KS3 students aged 11–14.

📦 What's included:

Structured across three sections of progressive difficulty:

Section 1 (30 marks) — key facts about air composition, the location of each process, and gas exchange terminology through multiple choice, true/false, and a fill-in-the-blank word summary

Section 2 (40 marks) — short answer questions, a process-comparison table, key term definitions, and analysis of a classic candle-and-jar experiment

Section 3 (30 marks) — extended writing on exercise physiology, rescue breaths, and a high-altitude case study requiring applied reasoning

Full answer key with detailed marking guidance included.

🎬 Watch the free video lesson: https://www.youtube.com/watch?v=0Guceqzok98

👩‍🏫 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