Question

what is the effect of the inclined axis of the Earth on the day and night

Answer 1

Earth's rotation is the cause for the differences in daytime and nighttime as it spins on its axis. When that axis is tilted towards the sun, the Northern Hemisphere receives more radiation than the Southern and vice versa when the axis is tilte away from the sun.
The seasons are caused as the Earth, tilted on its axis, travels in a loop around the Sun each year. Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun.