Is the Calvin Cycle light dependent or light independent?

Is the Calvin Cycle light dependent or light independent?

• A. Light dependent
• B. Light independent
• C. Both
• D. None

Answer: (B)

The Calvin Cycle does not require light to run directly. It uses the energy carriers—ATP and NADPH—produced by the light reactions to fix carbon and synthesize sugars. Because it doesn’t capture photons or rely on light-driven electron transport itself, it is considered light independent. It can operate in light or in the dark as long as ATP and NADPH are available from the previous light reactions. The light-dependent reactions, on the other hand, need light to function, generating the ATP and NADPH that power the Calvin Cycle. So the best description is light independent.

The Calvin Cycle does not require light to run directly. It uses the energy carriers—ATP and NADPH—produced by the light reactions to fix carbon and synthesize sugars. Because it doesn’t capture photons or rely on light-driven electron transport itself, it is considered light independent. It can operate in light or in the dark as long as ATP and NADPH are available from the previous light reactions. The light-dependent reactions, on the other hand, need light to function, generating the ATP and NADPH that power the Calvin Cycle. So the best description is light independent.