Mitochondria are double-walled membranous sacs with folded inner partitions called cristae.
Mitochondria releases energy from food molecules and transform energy into usable ATP which happens during cellular respiration
Mitochondria contains its own DNA and ribosomes, thus independently replicate itself and appear to control the synthesis of its membranes.
Chloroplasts are also double membrane organelles with inner folds called thylakoids.
Chloroplasts characteristic is quite similar with the mitochondria, but it is responsible in the conversion of light energy to chemical energy of sugars in the photosynthesis process in plants.