Question

which statement best describes what a thylakoid does during photosynthesis?
○ surrounds the grana and keeps them moist
○ enables the light-dependent reactions to occur
○ combines carbon dioxide and water to make sugar
○ helps the light-independent reactions to occur

Explanation:

Thylakoids are membrane - bound compartments inside chloroplasts. The light - dependent reactions of photosynthesis take place in the thylakoid membranes. Grana are stacks of thylakoids. The light - independent reactions (Calvin cycle) occur in the stroma (the fluid surrounding the grana). Combining carbon dioxide and water to make sugar is part of the light - independent reactions. The statement about surrounding grana and keeping them moist is not the main function. The key is that thylakoids are the site for light - dependent reactions.

Answer:

enables the light - dependent reactions to occur