Role of Chloroplast in Photosynthesis:
Chloroplasts are the organelles in plant cells where photosynthesis takes place. They contain chlorophyll, a pigment that absorbs light energy. Chloroplasts are responsible for converting light energy into chemical energy in the form of glucose. This process involves the light-dependent reactions in the thylakoid membranes and the light-independent reactions in the stroma of the chloroplast.

Role of Water in Photosynthesis:
Water is one of the essential raw materials for photosynthesis. During the light-dependent reactions of photosynthesis, water molecules are split into oxygen, protons, and electrons. This process, known as photolysis, releases oxygen as a byproduct and provides electrons for the photosynthetic electron transport chain. Water also helps to maintain turgidity in plant cells and serves as a solvent for various biochemical reactions in the plant.

Role of CO2 in Photosynthesis:
Carbon dioxide (CO2) is another crucial raw material for photosynthesis. During the light-independent reactions (Calvin cycle) of photosynthesis, CO2 is fixed and converted into glucose with the help of ATP and NADPH produced in the light-dependent reactions. This process is essential for the synthesis of carbohydrates, which serve as energy sources for plants and other organisms.
In summary, chloroplasts play a central role in photosynthesis by capturing light energy, water molecules are split to provide electrons, and CO2 is fixed to produce glucose. All these processes work together to convert light energy into chemical energy, which is essential for the survival of plants and the ecosystem as a whole.