Final answer:
The chloroplast in plant cells contains chlorophyll a and carries out photosynthesis.
Step-by-step explanation:
The part of plant cells that contains chlorophyll a and carries out photosynthesis is the chloroplast. Chloroplasts are organelles found in plant cells that are responsible for photosynthesis, the process by which plants convert sunlight into energy. Inside the chloroplasts, chlorophyll a is located in the thylakoid membranes, where it captures sunlight and initiates the photosynthetic reactions.
Learn more about Plant cells and photosynthesis