The photosynthetic organisms use sunlight energy and electrons from water in order to realize the CO2 conversion into organic compounds. This process is called carbon fixation.
Chloroplast represents a specialized plastid organelle, which carries out photosynthesis. During photosynthesis, reactions occur, they being grouped into two main categories, such that: photosynthetic electron transfer reactions, carbon-fixation reactions.
Carbon-fixation reaction produce the disaccharide sucrose, which is transported between plant cells as a source of energy and organic molecules, needed in the process of growing of plant.
Some of the chloroplast enzymes, used in carbon-fixation reaction, are inactive in dark, become active only if the plant is exposed to sunlight and the electron transport process is stimulated.