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Mitochondia: The inner membrane is folded into numerous cristae.Mitochondria are the power generators of the cell. They are capable of self-replication as they possess their own DNA.  In the mitochondria sugar is finally burnt during cellular respiration. The energy released in this process is stored as high-energy chemicals called adenosine triphosphate (ATP)Plastids Plastids are cellular organelles found only in the plant cell. Plastids are of three types - chloroplasts, chromoplasts and leucoplasts.NucleusNucleus is the large st organelles in a cell. Nucleus has different parts like the nuclear envelope, nucleolus and the chromosomes. 
mitochondria; there are 100-120 mitochondria IN EACH CELL. IT IS 2-8 of micron wide . they are made of double membrane wall. the inner membrane protrudes into the interior in folds forming cristae. the space between cristae is known as the matrix. they are responsible for respiration