why spirogyra and chlamydomonas are not included in protista ?

  • Earlier classification systems included bacteria, blue green algae, fungi, mosses, ferns, gymnosperms and the angiosperms under ‘Plants’.
  • The character that unified this whole kingdom was that all the organisms included had a cell wall in their cells.
  • This placed together groups which widely differed in other characteristics. It grouped together the unicellular organisms and the multicellular organisms. Example: Chlamydomonas and Spirogyra were placed together under algae.
  • All single-celled eukaryotes are placed under Protista, but the boundaries of this kingdom are not well defined.

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