Question

How many molecules of ATP are required for each Calvin cycle?

(a) 1

(b) 2

(c) 3

(d) 4

The question was posed to me by my college professor while I was bunking the class.

The above asked question is from Higher Plants Photosynthesis in chapter Photosynthesis in Higher Plants of Biology – Class 11

Answer 1

Correct option is (c) 3

Explanation: For every carbon dioxide molecule used up in the Calvin cycle, 3 molecules of ATP are required. Six cycles are required to produce one glucose molecule; hence 18 ATP molecules are required to produce one molecule of glucose.