To a perpendicular to the plane of ecliptic, Earth's axis of rotation

To a perpendicular to the plane of ecliptic, Earth’s axis of rotation makes an angle of 23½ degrees. Had this angle been zero degree, which one among the following would result ?
A) There would have been no season
B) The length of day and night would have been the same throughout the year
C) The length of the day and night would have been the same all over the earth
D) All of the above

There would have been no season

The length of day and night would have been the same throughout the year

The length of the day and night would have been the same all over the earth

All of the above

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC NDA-1 – 2015

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If Earth’s axis of rotation made an angle of zero degrees with the perpendicular to the plane of the ecliptic, it would mean the axis is perpendicular to the orbital plane. This configuration would eliminate the tilt that causes seasons. With no tilt, the sun’s rays would be directly overhead at the equator throughout the year. Consequently, every point on Earth would experience approximately 12 hours of daylight and 12 hours of darkness every day of the year, and there would be no significant seasonal variations in temperature or day length at any given latitude.

The tilt of Earth’s axis of rotation (currently 23.5 degrees) is the primary cause of seasons, varying day lengths throughout the year at latitudes away from the equator, and varying angles of incidence of solar radiation.

A zero-degree tilt would mean the terminator (the line separating day from night) would always pass through the poles. This would result in uniform day/night lengths of 12 hours everywhere on Earth throughout the year and the absence of distinct seasons.

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