The organelle that traps the energy of sunlight and converts it into chemical in form glucose is called chloroplast. Chloroplasts are organelles found in plant cells and some other organisms that conduct photosynthesis. Photosynthesis is the process by which light energy is converted into chemical energy in plants. Chloroplasts contain chlorophyll, a green pigment that absorbs light energy. This light energy is then used to convert water and carbon dioxide into glucose, a sugar molecule that plants use for energy.