Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labeled diagrams of both.

The double membrane bound cell-organelles are (1) Mitochondria (2) Chloroplast. Characteristics of Mitochondria and ChloroplastThe outer membrane forms the limiting membrane. The inner membrane encloses a lumen. It is known as matrix in mitochondria and stroma in chloroplast. Functions of Mitochondria (1) It is the site of aerobic respiration. (2) They produce cellular energy in the form of ATP; hence they are called as the "power house of the cell". Functions of Chloroplast (1) They are the site of photosynthesis. (2) They store the enzymes required for the synthesis of carbohydrates.