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

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Study for the 9th Grade Biology SOL Test. Prepare with flashcards and multiple choice questions, each featuring hints and explanations. Get ready for your exam!

Multiple Choice

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

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.

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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