Question

How many turns of Calvin cycle yield one
molecule of glucose ?
(a) Eight (b) Two
(c) Six (d) Four

Answer 1

The number of turns of Calvin that cycle yield one molecule of glucose is:

(c) Six

• During the Calvin cycle, the fixation of Carbon dioxide occurs.

• In one cycle one molecule of carbon is fixed.

• There is a total of 6 atoms of carbon in one glucose molecule.

• Thus, Six turns of the cycle will yield one molecule of glucose.

Answer 2

To produce one molecule of hexose sugar (having six carbon atoms) six turns of Calvin cycle are required.

Option (C) is correct.

Explanation:

Fixation of Carbon dioxide occurs during Calvin cycle.

There are three stages in the process of Calvin cycle:

• Carboxylation
• Reduction
• Regeneration

One turn of Calvin cycle fixes one molecule of carbon dioxide.

There are 6 atoms of carbon required for the production of one molecule of glucose.

Hence, to produce one molecule of hexose sugar (having six carbon atoms) six turns of Calvin cycle are required.

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