A scientist discovers a new organism with the characteristic features of locomotion and autotrophic nutrition. Which character(s) would help the scientist identify the organism belonging to Protista according to the five kingdom classification?
The scientist can identify the organism belonging to Kingdom Protista based on its unicellular nature and eukaryotic cell structure (presence of a true nucleus).
While Kingdom Plantae has autotrophic nutrition and Kingdom Animalia shows locomotion, both are multicellular. In the five kingdom classification, Protista includes single-celled eukaryotic organisms. Some protists are autotrophic, others are heterotrophic, and many show locomotion. Therefore, the combination of being unicellular and eukaryotic alongside locomotion and autotrophic nutrition confirms it is a protist, similar to Euglena.
Explanation
The textbook states that Kingdom Protista includes mostly unicellular organisms with a true nucleus (eukaryotes). While locomotion and autotrophic nutrition are observed in the discovered organism, these features alone overlap with Animalia and Plantae, respectively. The defining characteristics that place an organism in Protista are its unicellular and eukaryotic nature. The context also highlights organisms like Euglena (Organism R) that are unicellular, eukaryotic, move using flagella, and show photosynthesis.
Solution Steps
Step 1: Identify the defining features of Kingdom Protista from the context, which are being unicellular and eukaryotic (having a true nucleus).
Step 2: Recognize that locomotion and autotrophic nutrition alone are not exclusive to Protista, as Animalia shows locomotion and Plantae shows autotrophic nutrition, but both are multicellular.
Step 3: Conclude that the organism's unicellular and eukaryotic characteristics are the key identifiers for placing it in Protista.