Question

what best describes the relationship between the two sets of reactions of photosynthesis, which are the light - dependent reactions and the light - independent reactions?
a. each set produces sugars, and by working together they produce more sugars than they would produce separately.
b. each set produces half of a sugar molecule, and later the two halves are joined together.
c. only the light - dependent reactions produce sugars, but they depend on products of the light - independent reactions.
d. only the light - independent reactions produce sugars, but they depend on products of the light - dependent reactions.

Explanation:

In photosynthesis, light - dependent reactions produce ATP and NADPH which are used in the light - independent reactions (Calvin cycle) to produce sugars. The light - independent reactions rely on the products of the light - dependent reactions to fix carbon dioxide and make sugars.

Answer:

d. Only the light - independent reactions produce sugars, but they depend on products of the light - dependent reactions.