Final answer:
The statement is true: light-dependent reactions of photosynthesis use water and produce oxygen, as well as ATP and NADPH which are needed for the Calvin cycle.
Step-by-step explanation:
The statement that light-dependent reactions of photosynthesis use water and produce oxygen is true. During these reactions, light energy is absorbed and used to split water molecules (photolysis) into oxygen, protons, and electrons. Oxygen is then released as a byproduct.
In addition to producing oxygen, these reactions also generate ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate) which serve as energy carriers.
These energy carriers are subsequently used in the light-independent reactions, or the Calvin cycle, to convert carbon dioxide into glucose and other energy-storing carbohydrates.