What are the roles of chloroplasts and chlorophyll in photosynthesis

the role of chloroplasts mainly in photosynthesis is mainly to contain most of the reaction in photosynthesis. the plant will pump water into the leaves and the leaves will also absorb carbon dioxide. All of the thylakoids, chlorophyll, water, carbon dioxide, etc. are available inside the chloroplast.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added