Answer: Calvin cycle is the second stage of photosynthesis and does not require light.
Explanation: Photosynthetic reactions are divided into two phases: light dependent reactions and carbon fixation reactions. Light dependent reactions is the first stage of photosynthesis in which sunlight is used to split a molecule of water and the energy generated is conserved in form of ATP and NADPH.
Calvin cycle is the second stage of photosynthesis. It is also called carbon fixation reactions. These reactions do not need light to occur. It occurs in the dark, the ATP and NADPH produced in light dependent reactions are used to drive these reactions. In Calvin cycle, carbon dioxide is assimilated through a cyclic pathway to produce triose phosphate which is a precursor for glucose and other related molecules such as starch.
