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Plant cell has nuclear (in nucleus)and extranuclear DNA. Extranuclear DNA is in its mitochondria and Chloroplasts.Mitochondria and chloroplasts are semiautonomous and it is because they have their own DNA, mRNA, tRNA, ribosomes and they replicate by binary fission so they are said to be self governing.
What organelle contains the DNA of the cell? Most of the DNA in a cell is contained in the nucleus. However, DNA  can be found in mitochondria within animals, plants and fungi, and  in chloroplasts in plants as well.