Final answer:
The chloroplasts, containing chlorophyll, in plant cells allow for the capture and conversion of sun's light energy into chemical energy for photosynthesis. Photosynthetic protists also possess chloroplasts while photosynthetic bacteria lack chloroplasts, yet also perform photosynthesis.
Step-by-step explanation:
The organelle in plants that serves to capture energy from the sun for photosynthesis is the chloroplast. These chloroplasts contain a green pigment called chlorophyll. This substance is essential in absorbing the light energy that gets converted into the chemical energy required for photosynthesis.
Just like in plant cells, photosynthetic protists also harbour chloroplasts. Some bacteria, while capable of performing photosynthesis, don’t contain chloroplasts. Instead, their photosynthetic pigments are embedded in the thylakoid membrane within the cell itself, allowing them to convert sun's energy into chemical energy.
Moreover, there are organisms known as photoautotrophs, including green plants, algae, and cyanobacteria, that can capture and convert light energy from the sun into the chemical energy used to build food molecules.
Learn more about Chloroplasts in photosynthesis