Q. To a perpendicular to the plane of ecliptic, the Earth's axis of rotation makes an angle of 23 1/2 degrees. Had this angle been 0 degree, which one among the following would result?

1. There would have been no seasons
2. The lengths of day and night would have been the same throughout the year
3. The length of day and night would have been the same all over the Earth
4. All of the above