Question

Where do light and dark reactions of photosynthesis take place? Explain the two reactions in brief. [3 mark]

Answer 1

• The light reaction takes place in the chloroplast structures called grana. [1 mark]
• Light energy is converted into chemical energy and is stored as ATP molecules during this phase. Also, water that reaches the leaf splits into hydrogen and oxygen during light reaction. [1 mark]
• Dark reactions occur in the stroma of the chloroplast. During this process, hydrogen is added to carbon to form glucose using the energy of ATP molecules from the light reaction. [1 mark]