Question

What happens during the Calvin cycle? What is required for it to happen (does it need light? Where does the cycle take place?)

Answer 1

From Internet:

There are two stages of Photosynthesis –

Light-dependent reactions – As the name suggests, it requires light and mainly occurs during the daytime.

Light-independent reactions – It is also called the dark reaction or Calvin cycle or C3 cycle. This reaction occurs both in the presence and absence of sunlight.

Answer 2

The cycle takes place in the stroma of chloroplast, yes it needs light, it mostly needs CO2, but the calvin cycle is a process that turns CO2 into sugar.