Eukaryotic cell have many organelleles. These include Nucleus, Endomembrane System, Chloroplasts, Mitochondria, Peroxisomes. Endomembrane system is formed by Lysosomes, Vacuoles, Golgi apparatus and Endoplasmic reticulum as their functions are coordinated. Lysosomes are single membrane bound structures. These are formed by Golgi apparatus. These contain enzymes which bring about digestion of substances. These are regarded as suicidal bags. But Nuclei, Chloroplasts and Mitochondria are double membrane structures. In nuclei the outer and inner membrane encloses a perinuclear space. In Mitochodria the inner membrane forms cristae that are infoldings whereas outer membrane is smooth. Chloroplasts too shows outer and inner distinct layers.