AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Iron and steel is a basic industry because all other industries depend on it for machinery and raw materials. For example:
Since the production and consumption of steel drives so many sectors, it directly reflects a nation's industrial and economic growth — making it an index of development. Thus, being a basic industry is precisely why steel measures development; the two statements reinforce each other.
Source: Iron and Steel Industry, Chapter 6; Classification of Industries, Chapter 6
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Examiners look for: (1) a clear definition/link of "basic industry," (2) at least one example each from the three specified sectors (agriculture, defence, consumer goods), and (3) an explicit closing sentence connecting the two statements. Don't just list examples — show why being basic makes steel an index of development. That causal link earns the final mark.