How many Calvin cycles are required to produce 5 molecules of glucose?
a)	60	b)	15	c)	30	d)	90

(c)

Glucose is a hexose sugar. It’s one molecule contains six carbon atoms. As Calvin cycle takes in only one carbon (as at a time, six turns of this cycle will be required to produce one molecule of glucose (6C).

Hence, for producing 5 molecules of glucose (30 molecules of carbon), 30 turns of Calvin cycle are required.