Introduction to Photosynthesis Process: Light and Dark Reaction - Practice Questions & MCQ

• Photosynthesis is a two-step process. 
• The following reactions are involved in the process:
  • Light Reaction
  • Dark Reaction

Light Reaction:

• It occurs in the grana. 
• Grana contain packets of chlorophyll called quantasomes. Each quantasome contains 230 molecules of chlorophyll.
• Solar energy is trapped by chlorophyll.
• Splitting of water or photolysis of water occurs.
• Oxygen is released.
• ATP is produced in the process called photophosphorylation.
• NADP is reduced to form NADPH.
• It is depicted by Hill’s Reaction.

Dark Reaction:

• It occurs in the stroma of the chloroplast.
• Glucose is formed using carbon dioxide, ATP for energy, and NADPH as reducing power.
• It is also called the Calvin cycle.