The stacking of thylakoids and folding of cristae in chloroplasts and mitochondria are meant to increase the surface area. This gives more space to perform their specific functions.
Chloroplasts are the chloroplast pigment containing organs present specifically in the plant cells. The function of chloroplast is to perform the photosynthesis. The stacks of thylakoids are meant to increase the surface area and hence provide more space for the chlorophyll to absorb sunlight energy.
Mitochondria is the power house of the cell. It is a double membranous structure with the inner membrane folded into small finger-like projections called cristae. These cristae increase the surface area and hence various ETCs can be carried out simultaneously to increase the ATP production.
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