Question

what step in photosynthesis may occur during day and night?
a light - dependent reactions
b photolysis
c light - independent reactions

Explanation:

Photosynthesis has two main stages. The light - dependent reactions (including photolysis) require light. Light - independent reactions (Calvin cycle) use the products of light - dependent reactions (ATP and NADPH) and can occur when there is enough of these products, which can be during day (when light - dependent reactions are also happening) or night (if there is a sufficient supply of ATP and NADPH from previous light - dependent reactions).

Answer:

C. light - independent reactions