Plant cells need both chloroplasts and the Mitochondria because they are perform both the photosynthesis and the cell respiration. Chloroplast converts the light (solar) energy into the chemical energy during the photosynthesis, while the mitochondria, is the powerhouse of the cell produces the ATP- the energy currency of the cell during the respiration.
Mitochondria are the membrane-bound cell organelles (mitochondrion, singular) that generate the most of the chemical energy which are needed to the power of the cell's as biochemical reactions. Chemical energy is produced by the mitochondria which is stored in small molecule that is called adenosine triphosphate (ATP).
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