The critical diagnostic characters are being unicellular and eukaryotic. A single-celled body with a well-defined, membrane-bound nucleus and locomotor organelles like flagella confirms membership in Kingdom Protista, exemplified by Euglena.
Chapter 12 Patterns in Life Diversity and Classification Solutions
Class 9 Science Patterns in Life Diversity and Classification Exercise Solutions
Under Whittaker’s five kingdom classification, the defining criteria to place this organism into Protista are its unicellular organization and eukaryotic cellular structure. Multicellular autotrophs belong to Plantae, whereas prokaryotic autotrophs are placed in Monera. Therefore, possessing a distinct membrane-bound nucleus alongside locomotor structures like flagella within a single cell confirms it belongs to Protista.
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