Question

How many turns of Calvin cycle would generate one molecule of glucose/hexose?

• A. One cycle
• B. Three cycles
• C. Six cycles
• D. Twelve cycles

Answer 1

The correct option is C Six cycles

Carbon dioxide fixation occurs during Calvin cycle, which occurs in three stages- carboxylation, reduction and regeneration. One turn of Calvin cycle fixes one molecule of carbon dioxide. Hence, to produce one molecule of hexose sugar, six turns of Calvin cycle are required.