The Calvin-Benson cycle starts when

light is available

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light is not available

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carbon dioxide is attached to RuBP

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electrons leave a photosystem

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Solution

The correct option is B carbon dioxide is attached to RuBP
The Calvin cycle has three stages. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, the organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue.
So, the correct option is, 'carbon dioxide is attached to RuBP'.

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Similar questions

Light is needed for the Calvin - Benson cycle.

The dark reaction or Calvin-Benson cycle:

Light is needed for the Calvin- Benson cycle. True or False

C O_{2}

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