9th Grade Biology SOL Practice Test

If an organism is unicellular and autotrophic, to which kingdom is it most commonly assigned?

Protista Monera Fungi Plantae

Correct Answer:

Protista

Explanation:

The main idea here is how scientists group organisms by cellular structure and how they obtain energy. A single-celled organism that can make its own food is typically a unicellular photosynthetic eukaryote, like many algae. Protista is the kingdom that is used for such organisms in many intro biology courses because they are single-celled and eukaryotic, and many are autotrophic. Plantae, by contrast, are multicellular and organized into tissues; Fungi are mostly heterotrophic decomposers; Monera covers prokaryotic organisms, which lack a true nucleus. Since the description points to a one-celled photosynthetic organism, Protista is the best fit.

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