Question

what would happen if conventional signs and symbols were not present on map

Answer 1

hey!
here is your answer
if conventional signs and symbols were not present on map, it would had been very difficult to locate a place on a topo sheet or on even on an ordinary map
hope it helps you
have a wonderful day ahead

Answer 2

Cartographic signs and symbols on maps help us to understand the topography of land, the green cover or other features such as average elevation of land, average temperatures, relative distance etc.

These signs and symbols enrich the information available on map, which are used by geographers, researchers etc. Without this information, it would be a plain map which cannot be used for relative purposes by the user.