The dark reactions of photosynthesis rely on the light reactions to provide the energy and reducing power needed to convert carbon dioxide and water into glucose and oxygen. Here's how the dark reactions are dependent on light reactions:

1. ATP: The light reactions generate ATP (adenosine triphosphate) molecules. ATP carries chemical energy that is essential for the dark reactions to occur. It is utilized by enzymes involved in carbon dioxide fixation and other metabolic reactions.

2. NADPH: The light reactions produce NADPH (nicotinamide adenine dinucleotide phosphate). NADPH is a reducing agent that provides the high-energy electrons necessary to convert carbon dioxide into glucose. It acts as an electron donor in the Calvin cycle, the central pathway of the dark reactions.

3. Oxygen Release: The light reactions generate oxygen as a byproduct of splitting water molecules. This oxygen is released into the atmosphere as a waste product of photosynthesis.

Therefore, the dark reactions that take place in plants heavily depend on the light reactions for the supply of ATP and NADPH, as well as the removal of oxygen generated during the process. Without the energy and reducing power provided by the light reactions, the dark reactions could not occur, and the process of photosynthesis would be incomplete.