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Photosynthesis and Respiration
A free video lesson on photosynthesis and respiration — how plants store the Sun's energy in food, how all living cells release it, and how the two reactions connect. Followed by real quiz questions, marked instantly. No account needed.
Almost all life runs on two linked reactions. This lesson explains photosynthesis (carbon dioxide + water → glucose + oxygen), respiration (glucose + oxygen → carbon dioxide + water), anaerobic respiration and fermentation, and how the two processes are roughly opposite and depend on each other. It is part of Learning Hub, a UK-curriculum learning site built by a home-educating family.
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Questions parents ask
- What is the word equation for photosynthesis?
- Carbon dioxide + water → glucose + oxygen. It happens in the chloroplasts, using light energy trapped by chlorophyll.
- How are photosynthesis and respiration linked?
- They are roughly opposite reactions. Photosynthesis stores energy by making glucose and oxygen; respiration (glucose + oxygen → carbon dioxide + water) releases that energy. The products of one are the reactants of the other.
- Is this suitable for KS3 and GCSE?
- Yes. Photosynthesis and respiration is a core biology topic for Years 9 to 11 (KS3 and GCSE), and this lesson and quiz work as a clear introduction.
- Is it really free?
- The video and these questions are free with no account. The full site is £6.99 a month for the whole family, with a 14-day free trial and no card needed to start.