Question

Which of the following is not true about the formation of winds due to uneven heating of land at Equator and Polar regions?
A. The winds blow from 0-30⁰ latitudes, taking place of the warm air at the equator that has risen up, towards the equator and constitute the Polar winds.
B. The cool air at the poles rushes in to take place of the warmer winds in the 60⁰ belt and constitute the Polar winds.
C. The winds of the wind are not exactly in the North-South direction because of the rotation of the earth.
D. The pressure difference between the equatorial and Polar Regions leads to the formation of winds in the North-South direction.

Answer 1

Wind is formed due to the uneven heating of the earth’s surface, Warm air rises up and cool air takes its place which causes a difference in pressure. The region where air rises up lowers the pressure and the region where air sinks increases the pressure. The rotation of earth is responsible for the winds in north-south direction.

Complete step by step answer:
The formation of winds due to uneven heating of land at equator and polar regions takes place due to the following reasons:
The uneven heating occurs at different regions of the earth due to its shape i.e., geoid shape. The earth is widened at the centre and flattened (narrower) at the poles i.e. upper and lower portion of the earth.
The winds blow from 0 to 30 degree latitudes where the warm air rises up at the equator (0⁰latitude) as the warm air becomes lighter. When the air gets heated its density decreases due to the increase in volume and it becomes lighter.
The colder air at the poles blows to occupy the place of warmer air in the 60⁰ belt as when the air get colder, its density increases due to decrease in its volume and the colder air sinks to take its place.
The direction of wind is not exactly in the North-South direction as due to the rotation of earth, in the northern hemisphere the earth rotates anticlockwise and the wind is deflected to the right side. In the southern hemisphere, it rotates clockwise which deflects the wind to the left.
The pressure difference is not responsible for the formation of winds in the North-South direction.
Therefore, option D is correct.

Note: The formation of wind is due to the rotation of earth and the blowing air gets deflected towards the right side in the northern part and towards the left side in the southern part. This deflection is known as Coriolis effect.