Answer: b. Light independent
Explanation: Photosynthesis is a process where carbohydrtes are formed with energy from the sunlight, in cianobacteria, algae and plants. This process has two steps:
- The first step are light dependent reactions where sunlight excites chlorophyll molecules and electrons are transport through photosystems. In this step, NADPH and oxygen are produced.
- The second step are light independent reactions called Calvin cycle, where CO2 is fixated to form carbohydrates using NADPH as energy source.
