I would say "no" but I'm not a grass expert. Also I'm not sure if by "most" you mean most species of grass, most individual grass plants, greater than 51% or what. But I do know that there are a whole lot of grasses that don't have a main tap root.
No. Most grasses have fibrous roots.
Plants have three types of root systems: 1.) taproot, with a main taproot that is large and grows faster than the branch roots; 2.) fibrous, with all roots about the same size; 3.) adventitious, roots that form on any plant part other than the roots. Fibrous systems are characteristic of grasses and are shallower than the taproot systems found on most eudicots and many gymnosperms.
If you mean tap root, carrots and dandelions have tap root systems.
Tap root and fibrous root are two systems. Tap root system is prevalent in dicots and fibrous root system in monocots.
Tap root and Adventitious roots
Tap root system
The tap root is (in most plants) the largest root.
the tap root
Tap root
Tap root
i belive it has a tap root i might be wrong :I
Tap root