Chloroplast is most or likely like a solar cell. Chloroplast absorbs light, just like when photosynthesis happens in a plant. For a plant to live, photosynthesis will need to happen for then it can do the activities it will need to do.
Please review this and if you don’t think this is quite similar to what you study, please don’t take this advice for you may get it wrong. I got this from a website but rephrased. Most times the internet can help you with answers
