Gas Exchange and Stomata - FREE KS3 Biology Worksheet

Find out how a leaf swaps carbon dioxide and oxygen through tiny holes 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.

Gas exchange is when a photosynthesising leaf takes in carbon dioxide gas and releases waste oxygen gas. The small holes in the surface of a leaf that let the gases pass through are called stomata.

The worksheet has three questions worth 13 marks in total. Question 1 is a multiple choice question on the waste product of photosynthesis (2 marks). Question 2 is a fill-in-the-blank with a word bank, covering what photosynthesis makes, where the water and carbon dioxide come from, and where the holes are found on the leaf (5 marks). Question 3 is a short written answer explaining why a photosynthesising leaf needs gas exchange, using the word summary for photosynthesis (6 marks). A full answer key 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/gas-exchange-and-stomata/?utm_source=payhip&utm_medium=listing

Watch the full lesson on YouTube: https://youtu.be/tTMSPo6Osec

Want more? The full 100-mark premium worksheet goes deeper into how guard cells open and close the stomata, why plants lose water through open stomata, and how diffusion moves gases in and out of a leaf. A complete lesson bundle with the extension pack is also available.

gas exchange

stomata

guard cells

diffusion

photosynthesis

leaves

plants

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answer key included