Members in a kingdom are similar in
All characters
Fundamental characters
All morphological characters
All characters and can interbreed among themselves
Taxonomic Hierarchy (Taxonomic categories)
Kingdom- It is the highest taxonomic category. All the plants are included in the kingdom Plantae. The members included in one kingdom share fundamental characters.
Therefore,
-
The members belonging to the kingdom have similar fundamental characters, like in Kingdom Animalia all the organisms are multicellular, lack cell walls and are heterotrophic.