International A Level Biology / Photosynthesis

The light-dependent reactions

Edexcel International A Level Biology (YBI11), chapter 14: Photosynthesis, specification point 5.3. Part of the full course.

Read the revision notes · International A Level Biology past papers

The light-dependent reactions use light energy to make ATP and reduced NADP for the next stage of photosynthesis. They take place on the thylakoid membranes, where electron movement, water splitting and a proton gradient are linked.

More lessons in Photosynthesis

• Photosynthesis: the overall reaction
• ATP: the immediate energy supply
• Chloroplast structure and function
• Absorption and action spectra
• Separating leaf pigments by chromatography
• Cyclic and non-cyclic photophosphorylation
• The Calvin cycle
• What the plant makes from GALP
• Core practical 10: measuring the rate of photosynthesis
• Limiting factors: light, carbon dioxide, temperature and wavelength