Statement I : Wind is deflected to the right in northern hemisphere and to the left in southern hemisphere from its normal course. Statement II : Earth rotates from west to east.

Statement I is correct as the Coriolis effect causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere [3]. This phenomenon is also known as Ferrel's Law [3]. Statement II is also correct because the Earth rotates on its axis from west to east [t5]. Statement II provides the correct explanation for Statement I because the Coriolis effect is an apparent force directly caused by the Earth's rotation [c1][c3][t2]. As the Earth turns underneath moving air, the rotation creates a deflection relative to the surface [t3]. Without this rotation, air would simply flow in a straight line from high to low pressure areas [t2][t6]. Therefore, the Earth's west-to-east rotation is the fundamental cause of the observed wind deflection patterns described in Statement I.

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > UPSC Prelims 2011] Which one of the following weather conditions is indicated by a sudden fall in barometer reading? > p. 308
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Why Tropical Cyclones Do Not Form At The Equator? > p. 310
3. [3] CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 4: Climate > Pressure and Winds > p. 28