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Primary through secondary schools with either Urdu as the language of instruction or at least as a mandatory subject have sprung up not only in Mumbai , but deep into the hinterland of the coast . Up to that time I had known about it only generally or through secondary sources . The plastids of many algae are surrounded by three or four membranes , thought to be a consequence of their evolutionary origin through secondary endosymbiosis between photosynthetic and non-photosynthetic eukaryotes . But as long as inch-pound units appear in the media and in consumer communication ( advertisement , product labels ) , many people will end up feeling more familiar with them , in particular the generation that went through secondary education before the 1970s . This will firmly carry forward the idea that it is the duty of all youths to study - - through secondary schools , in addition to going up to the sixth grade - - and that no one has the right to be an illiterate , that no one has the right to be an incompetent , that no one has the right to be ignorant .