Which primary function do chloroplasts perform in plant and algal cells?

• A. They package and modify proteins for secretion via the endomembrane system.
• B. They synthesize ATP primarily through oxidative phosphorylation during cellular respiration.
• C. They carry out photosynthesis by converting light energy into chemical energy stored in sugars.
• D. They store and transmit genetic information as the cell’s main repository of DNA.

Answer: (C)