Question

does grass belongs to thallophyta as does not have well differentiated body?

are thalophyta , bryophyta and pteridophyta are the examples of cryptogams?

Answer 1

No grass does not belong to thallophyta as thallophyta do not possess roots, stems, leaves and do not produce flowers, seeds or fruits, where as grass possess root systems and small, inconspicuous flowers.

Thallophytes, bryophytes and pteridophytes are all cryptogams, i.e., spore-producing plants.