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

Find out why breathing, respiration and gas exchange are three completely different processes with this free KS3 Biology worksheet — no preparation required, just download and use. Breathing moves air in and out of the lungs, while respiration and gas exchange are separate processes happening inside cells and blood vessels, and this taster resource introduces the basics for students aged 11–14.

📦 What's included:

3 questions, 13 marks:

Multiple choice — testing knowledge of what air is actually made of

Fill-in-the-blank — using a word bank to complete the definition of breathing

Short answer — explaining why nitrogen is not important for breathing, despite making up most of the air

Full answer key with 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.

🔓 This is a taster only. The full 100-mark worksheet goes deeper into cellular respiration and mitochondria, gas exchange between the air sacs and blood, and a candle experiment that reveals what actually changes in the air you breathe out — available on its own, or as part of the Complete Lesson Pack with extension activities. Save £1 buying the pack (£3 + £3 = £6 separately, £5 together).

Price: Free