Find out why breathing, respiration and gas exchange are three completely different processes in this free KS3 Biology worksheet — no preparation needed, just download and use. Perfect as a lesson starter, homework task, or quick revision activity for students aged 11-14. Breathing moves air in and out of the lungs, while respiration and gas exchange are separate processes happening inside cells and blood vessels — this worksheet introduces the first of these ideas clearly and simply.

This worksheet includes three questions worth 13 marks in total. Question 1 is a multiple-choice question testing knowledge of what air is actually made of. Question 2 is a fill-in-the-blank task using a word bank to complete the definition of breathing. Question 3 is a short-answer question asking students to explain why nitrogen is not important for breathing, despite making up most of the air. A full answer key with marking guidance is included.

Want more? The full 100-mark premium 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. A complete lesson bundle combining the full worksheet and extension activities is also available on the iNewittAll TES store.

TAGS: breathing, respiration, gas exchange, KS3 biology, KS3 science, cellular respiration, mitochondria, lungs, diffusion, free worksheet, biology revision, science homework, year 7, year 8, year 9

PRICE: Free

KEY STAGE: KS3

SUBJECT: Biology