The common features of kingdom protista are :
(a) It consists of unicellular or colonial eukaryotic organisms.
(b) They have diverse modes of nutrition - photosynthetic, saprobic, parasitic etc.
(c) They bear cilia or flagella for locomotion. Some move with the help of pseudopodia.
(d) The cellular organisation is of two envelope type, i.e., plasma membrane, internal membranes.
(e) Genetic material is organised in the form of nucleus.
(f) They are either haploid or diploid