Practice question

MCQ

Question

The boundaries of Kingdom Protista are not well-defined primarily because:

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They lack a true nucleus and membrane-bound organelles. They exhibit both prokaryotic and eukaryotic cellular organizations. What may be a photosynthetic protistan to one biologist may be a plant to another. Correct They are found exclusively in highly extreme, unobservable environments.

Explanation

explicitly mentions that the boundaries of Kingdom Protista are not well-defined. This ambiguity arises because all single-celled eukaryotes are placed here, leading to overlapping characteristics. What one biologist categorizes as a simple 'photosynthetic protistan' (like a diatom or euglena), another biologist might classify as a single-celled 'plant' due to the presence of chloroplasts and photosynthetic capabilities.

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