Which organelle in the plant cell is mostly responsible for photosynthesis? How did this organelle evolve?

plant cells is the answer for number one i think

In plant cells, the organelle that is responsible for photosynthesis is called a chloroplast. It is thought that the chloroplast evolved from a photosynthetic bacteria that was engulfed by a cell in a process called endosymbiosis. Once the cell engulfed the bacteria, a symbiotic relationship occurred and the bacteria remained inside the cell.