Here's a breakdown:

* Chloroplasts are organelles found within plant cells (and some algae).

* They contain the green pigment chlorophyll, which captures light energy from the sun.

* This light energy is used to convert carbon dioxide and water into glucose (sugar) and oxygen. This process is known as photosynthesis.

So, while the entire plant might be involved in photosynthesis, the chloroplasts within the plant cells are the specific location where the process actually occurs.