Biology · GCSE · Cells & Organisation
The photosynthesis reaction
gcse-biol-4-4-1-1Free2:04Heddy Score 2 of 7, below the standardPlays from youtube-nocookie.com. No YouTube cookies until you press play.
What you need to know
- Photosynthesis turns carbon dioxide and water into glucose and oxygen
- It is endothermic and needs light energy absorbed by chlorophyll
In this clip
0:00–2:04The photosynthesis reactiongcse-biol-4-4-1-12:04–5:13Rate of photosynthesis and limiting factorsgcse-biol-4-4-1-2aHeddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.2/7, Below the standard
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · not judged yet. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
How the Heddy Score worksNot enough students yet
Our own students' answers. These are what move ★7 Proven.Why we picked it
A short GCSE lesson on the photosynthesis equation and limiting factors.
Freesciencelessons on YouTubechecked 2026-10-16