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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.
In eukaryotic cells, like in the maize cell shown here, DNA is located in the nucleus, the mitochondria and the chloroplasts (occuring only in plants and some protists). The nucleus contains most DNA. It is present in this compartment in the form of linear chromosomes that together constitute the genome.