Chloroplast is the double membranous cell organelle that is the site of photosynthesis. It consists of a colourless fluid that consists of different enzymes. The enzyme RuBisCO is present in the stroma. Hence, stroma is the site of the dark reaction of photosynthesis. It is responsible for the enzymatic reactions leading to glucose synthesis.

Chloroplast is the double membranous cell organelle that is the site of photosynthesis. It consists of membranous sac-like structures called thylakoids. The thylakoids are arranged one above the other to form tightly stacked structures called grana. The grana are connected by stroma lamellae. The photosynthetic pigments are located on the membrane of the grana. It is the site of the light reaction of photosynthesis. The assimilatory powers such as ATP and NADPH 2 are formed in grana.