Question

why is the third step of Calvin cycle called as regeneration step??​

Answer 1

Answer:

●Because RuBP, the molecule needed at the start of the cycle, is regenerated from G3P. Because G3P has three carbon atoms, and each turn of the cycle takes in one carbon atom in the form of carbon dioxide.

Answer 2

Calvin cycle or C3 cycle is defined as a set of chemical reactions performed by the plants to reduce carbon dioxide and other compounds into glucose.

Calvin cycle is also known as the C3 cycle or light-independent or dark reaction of photosynthesis. However, it is most active during the day when NADPH and ATP are abundant. To build organic molecules, the plant cells use raw materials provided by the light reactions:

Because the G3P exported from the chloroplast has three carbon atoms, it takes three “turns” of the Calvin cycle to fix enough net carbon to export one G3P. But each turn makes two G3Ps, thus three turns make six G3Ps.

(OR)

Because RuBP, the molecule needed at the start of the cycle, is regenerated from G3P. Because G3P has three carbon atoms, and each turn of the cycle takes in one carbon atom in the form of carbon dioxide.

(OR)

The third step is known as regeneration because Ribulose-bis phosphate that begins the cycle is regenerated from G3P.