Gas Exchange and Stomata - Complete KS3 Biology Lesson Pack

Everything you need to teach gas exchange and stomata at KS3 — two complete resources, full answer keys, and no preparation required. This lesson pack covers how leaves swap carbon dioxide and oxygen, how guard cells open and close the holes, water loss and diffusion for students aged 11-14. Gas exchange is when a photosynthesising leaf takes in carbon dioxide gas and releases waste oxygen gas.

The main worksheet contains 18 questions worth 100 marks across three progressive sections: recall through multiple choice, a true or false table and a word bank fill-in-the-blank (30 marks); application through key term definitions, a gas movement table and short answers (40 marks); and extended answers on cacti, wilting plants and whether leaves should keep their stomata open (30 marks). The extension pack provides four enrichment activities — a 12-term vocabulary matching exercise (12 marks), a challenge quiz (27 marks), a greenhouse tomato case study (19 marks) and a Teach It Back task assessed with a rubric. Full answer keys and detailed marking guidance are included for everything. Everything 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

Buying this bundle saves £1 compared to purchasing both resources separately (£3 + £3 = £6 individually, £5 as a pack).

WHAT'S INCLUDED:

MAIN WORKSHEET:

- 18 questions, 100 marks total

- Section 1: Knowledge recall (30 marks) — 5 multiple choice questions, a 10-statement true or false table, a 10-gap word bank fill-in-the-blank

- Section 2: Application and understanding (40 marks) — key term definitions, a gas movement table, short answers

- Section 3: Extension and analysis (30 marks) — three 10-mark extended answers

- Full answer key with detailed marking guidance

EXTENSION PACK:

- 4 activities: Vocabulary matching (12 marks), Challenge quiz (27 marks), Case study (19 marks), Teach It Back (rubric-assessed)

- Full answer keys for all activities

FILE FORMATS:

- PDF and editable Word file (DOCX) for every resource

gas exchange

stomata

guard cells

diffusion

photosynthesis

KS3 Biology

KS3 Science

lesson pack

bundle

complete resource

worksheet bundle

extension

answer key included