The cells that contain chloroplasts are found in plant leaves. Chloroplasts are the cellular organelles responsible for carrying out photosynthesis, which is the process by which plants convert sunlight into energy to fuel their growth. To determine which cells in a plant contain chloroplasts, you can observe the distinctive green coloration of the leaf tissue. This green color is due to the presence of chlorophyll, the pigment found within chloroplasts that captures light energy for photosynthesis. While plants have cells in their roots and stems, these cells do not typically contain chloroplasts and are not directly involved in photosynthesis.