Variations in the length of daytime and nighttime from season to season are due to

a) the earth’s rotation on its axis
b) the earth’s revolution round the sun in an elliptical manner
c) latitudinal position of the place
d) revolution of the earth on a tilted axis

Ans-[D]

Explanation- This is due to revolution of earth around the sun on it’s tilted axis which causes this variations. Solstices and equinoxes are characteristic phenomenon due to this thing.