Explanation

Conversion of carbon dioxide to simple (reduced) organic compounds is called carbon dioxide assimilation or carbon dioxide fixation or carbon fixation. This fixation pathway was elucidated in the early 1950s by Melvin Calvin and coworkers and is often called as Calvin cycle. Since, one molecule of carbon is fixed in one turn of the Calvin cycle. So, six turns of the cycle are required to fix the glucose molecule containing six carbon atmos.