Question

Where do light and dark reactions of photosynthesis take place? Explain the two reactions in brief. (4 marks)

Answer 1

Light Reaction:

• The light reaction takes place in the chloroplast structures called grana.
• 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. (2 marks)

Dark reaction:

• 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.
  (2 marks)