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Chloroplast Function. Chloroplasts are very similar to mitochondria, but are found only in the cells of plants and some algae. Like mitochondria, chloroplasts produce food for their cells. Chloroplasts help turn sunlight into food that can be used by the cell, a process known as photosynthesis.
Quick Answer. The primary function of the mitochondria is to produce ATP, the molecule that the cell uses for energy when carrying out essential functions. The process by which glucose is converted to ATP in the mitochondria is known as cellular respiration and occurs in mitochondria of both plant and animal cells.