A Level Biology Practice Exam 2025 – All-in-One Study Guide to Excel in Your A Levels!

Question: 1 / 715

Which kingdom includes unicellular eukaryotic organisms?

Monera

Animalia

Protista

The kingdom that includes unicellular eukaryotic organisms is indeed Protista. This kingdom is diverse and encompasses a wide range of organisms, including algae, protozoa, and slime molds. These organisms can be either autotrophic (making their own food through photosynthesis) or heterotrophic (obtaining food by consuming other organisms). The key characteristic of Protista is that the members are primarily composed of eukaryotic cells, which have a true nucleus and other membrane-bound organelles, distinguishing them from prokaryotic organisms found in the Monera kingdom.

While Monera consists of unicellular organisms, they are prokaryotes, which lack a true nucleus. Animalia includes multicellular organisms and does not encompass unicellular forms, and Fungi is primarily composed of multicellular organisms, though some fungi can exist as unicellular yeasts. Thus, Protista is the only kingdom among the choices that exclusively contains unicellular eukaryotic organisms.

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