Question

Why are wheels of vehicle are provided with mud guards?

Answer 1

Basically they are to avoid the dirty water to splash when the wheels move on  water. these mud guards prevent splashing of water along the wheels ..
Hope it helps u   ...   :)

Answer 2

Wheels of vehicle are provided with mud guards because mud guards prevent the wheels from splashing the mud or water on our body or body of the vehicle. They play a role in preventing us from being dirty due to water or mud.

I hope it helped.