Why bryophytes do not attain great heights ?

Explanation

Bryophytes seldom achive great heights . The possible reasons are :
1. Absence of roots .
2. Materials are transported from cell to cell .
3. Absence of vascular tissues.
4.Absence of cuticle on the plant body.
5. Requirement of external sheet of water for capillary conduction to all parts and transport of male gametes.