Question

Which phase of the Calvin cycle is responsible for adding energy to the captured CO2 molecules?

Reduction

Fixation

Regeneration

All answers are correct

Answer 1

Which phase of the Calvin cycle is responsible for adding energy to the captured CO2 molecules

Reduction = It is the second stage of calvin cycle.ATP and NADPH are used to covert the 3-PGA molecules into the Glyceraldehyde -3-phosphate.In this step six molecules of ATP & NADPH are used.

INCORRECT OPTIONS :

Regeneration = this is the third stage of calvin cycle.some Glyceraldehyde -3-phosphate molecules make glucose and others must be recycled to regenerate the ribulose 1,3 -bisphosphate acceptor.

this step requires ATP.

but this energy is not added to the captured CO2 molecules.

FIXATION =

The CO2 is fixed, CO2 molecules that reacts with one molecule RuBP , two molecules of 3-phosphoglyceric (3-PGA) form.in this stage carbon is fixed but does not requires energy.