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photosynthesis - the process in which carbon dioxide (CO2) and water (H2O) are used to produce  carbohydrates and evolve oxygen (O2) in the presence of light and chlorophyll; the net result is that light energy (radiant energy) is converted into chemical energy in the form of fixed carbon compounds (carbohydrates). 
    chloroplast - the green plastid in which photosynthesis occurs.

    chlorophyll - the green plant pigment in chloroplasts that absorbs the light needed for

    thylakoids - flattened, sack-like membranes inside a chloroplast; contain the chlorophyll.

    granum (pl.grana) - stacks of thylakoids. 

    stroma lamellae (pl. stroma lamella) - tubular membranes that connect the grana in the

    stroma - the fluid matrix of the chloroplast 

Cross-section of a chloroplast

This Net Equation is Made up of Two Separate Reactions
Light Reaction - the reaction that uses the water and  light energy and evolves oxygen.
                          It is also called the Hill Reaction.

Dark Reaction - the reaction that uses the carbon dioxide and produces the carbohydrate.
                          It is also called the Calvin-Benson Cycle or  Photosynthetic Carbon
                          Reduction (PCR) Cycle.