The plant cell with many chloroplasts is called a mesophyll cell. Mesophyll cells are found in the leaves of plants and are responsible for photosynthesis, which is the process of converting sunlight into energy. These cells contain numerous chloroplasts, which are the organelles responsible for capturing light energy and carrying out photosynthesis. The abundance of chloroplasts in mesophyll cells allows for efficient absorption of sunlight and production of energy-rich molecules like glucose.