What is the function of chloroplasts in plant cells?

• A. They store nutrients.
• B. They regulate water balance.
• C. They carry out photosynthesis to convert light energy into chemical energy (glucose).
• D. They transport proteins.

Answer: (C)

Chloroplasts are the part of plant cells where photosynthesis happens, using light energy to make chemical energy stored as glucose. They contain chlorophyll to capture light and drive reactions that convert light, water, and carbon dioxide into glucose, with oxygen released as a byproduct. This stored chemical energy in glucose can be used later by the plant or stored as starch inside the chloroplasts. That’s why the best description is that chloroplasts carry out photosynthesis to transform light energy into chemical energy (glucose). The other options don’t fit because storing nutrients is done by other structures like vacuoles or storage tissues, regulating water balance is managed by water-moving processes in membranes and vacuoles, and transporting proteins involves the cell’s transport systems rather than chloroplasts.