Discussion
Assertion (A) : Polar easterlies in the northern hemisphere move towards the right direction.
Reason (R) : The Earth rotating on its axis affects the direction of the winds.
Answer: A
Both (A) and (R) are true and (R) is the correct explanation of (A).
The polar easterlies blow out from the polar high-pressure belt towards the sub-polar low. Moving from the pole towards lower latitudes, they are deflected to the right in the northern hemisphere, which is why they blow from the east.
The deflection is caused by the Earth's rotation on its axis, the Coriolis effect, which turns moving air to the right in the northern hemisphere and to the left in the southern. So the reason gives the cause of the behaviour the assertion describes, which rules out the option saying it does not explain A and the options calling either statement false.
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