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Q117 (IAS/2007) Geography › World Physical Geography › Ocean water properties Answer Verified

Consider the following statements: 1. The annual range of temperature is greater in the Pacific Ocean than that in the Atlantic Ocean. 2. The annual range of temperature is greater in the Northern Hemisphere than that in the Southern Hemisphere. Which of the statements given above is/are correct?

Result
Your answer: —  Â·  Correct: B
Explanation

Statement 2 is correct: the Northern Hemisphere exhibits a larger annual temperature range because it has a greater proportion of land (which heats and cools more rapidly than water), producing stronger seasonal contrasts and higher mean temperatures in the north [4]. Statement 1 is false: there is no authoritative support that the Pacific has a larger annual SST range than the Atlantic; in fact the Pacific’s thermal equator lies closer to the geographic equator and the vast Pacific expanse tends to mute seasonal SST swings compared with narrower basins, while annual ranges are strongly modulated by currents and prevailing winds (which differ between basins) [3]. Therefore only statement 2 is correct.

Sources

  1. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 12: Water (Oceans) > Horizontal and Vertical Distribution of Temperature > p. 104
  2. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 21: Horizontal Distribution of Temperature > ity (far from the moderating effect of the seas). > p. 288
  3. [2] https://www.britannica.com/place/Pacific-Ocean/Temperature-and-salinity
  4. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 33: Ocean temperature and salinity > Range of Ocean Temperature > p. 517
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