Consider the following pairs with reference to world climate types and their characteristics: (Climate) (Characteristic) I. Tropical wet and dry : Winter dry season II. Mid-latitude steppe : Mid-latitude semi-arid or dry III. Humid sub-tropical : No dry season, warm summer IV. Marine west coast : No dry season, severely cold summer How many of the pairs given above is/are correctly matched?

Based on the Köppen climate classification, Pair I is correct as Tropical wet and dry (Savanna, Aw) is characterized by a distinct winter dry season [2]. Pair II is correct; Mid-latitude steppe (BSk) is defined as mid-latitude semi-arid or dry, often influenced by continentality or rain shadow effects [2]. Pair III is correct as the Humid subtropical climate (Cfa) features no dry season with rainfall throughout the year and a warm to hot summer [2]. Pair IV is incorrect; while the Marine west coast climate (Cfb) has no dry season, it is characterized by warm or cool summers, not 'severely cold' summers [2]. Severely cold conditions are typically associated with subarctic (Dfc) or polar climates [2]. Therefore, three pairs (I, II, and III) are correctly matched.

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 30: Climatic Regions > Köppen–Geiger Climate Classification > p. 422
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 30: Climatic Regions > Major Climatic Types According to Koppen > p. 421