Maybe no seasons or seasonal change
no seasons
There would be no four seasons if the earths axis was not tilted.
In that case, the seasons would be more pronounced.
In that case, the seasons would be more pronounced.
If the earth was not tilted at an angle of 23.5 degrees, there would not be the different seasons.
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Seasonal cycle
Yes. Day and night are caused by the rotation of the Earth on it's axis and has nothing to do with it's tilt. The tilt has an effect on seasons.
It is tilted (23.5 degrees).
The Earth is tilted on its axis.
No
Winter, spring, summer, autumn. The Earth is ALWAYS tilted, otherwise there would be no seasons. (see related question)