A chloroplast is an organelle within the cells of plants and certain algae. It's where photosynthesis happens, where energy from the Sun is converted into chemical energy.
- Chloroplast contain thylakoids, a flattened membrane sac inside the chloroplast, used to convert light energy into chemical energy.
- They are the site of the light-dependent reactions of photosynthesis.
- The light-dependent reaction is the first stage of photosynthesis.
- It is initiated when light energy is absorbed by the chlorophyll in the chloroplasts.