Question

why kigdom protista is considered as polyphyletic group ​

Answer 1

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Explanation:   “ ‘Kingdom Protista’ is not monophyletic; it contains organisms which are more closely related to members of other kingdoms than they are to other protists. It's also defined on the absence of characters (i.e. no complex development from embryos, no extensive cell differentiation, etc.), which is considered poor form.” i.e. the Protista are a paraphyletic grouping based on shared primitive characteristics.  

Not surprisingly then, the Kingdom Protista is difficult to define:  Generally they are eukaryotes that are unicellular, though if multicellar (e.g. seaweeds) there is little specialization of tissues.

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