Jowar is a hardy millet that can grow well in semi-arid regions. It is relatively suited to conditions with limited rainfall and can tolerate dry spells better than many water-demanding crops.
Humid, cold, and coastal conditions are not the general region type emphasized for its cultivation in this question. The key association is between jowar and semi-arid agriculture, especially in parts of the Deccan and other dry farming areas.
This fact is useful in physical and human geography because it connects the location, process, and characteristic asked in the question. In examination questions, compare the wording of each option carefully and identify the specific concept rather than choosing an answer based only on a familiar term.

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