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Which of the following is NOT a unicellular organism?
Paramecium
Bacteria
Fungi
Chlamydomonas
Fungi
Fungi is not a unicellular organism because the vast majority of fungi, such as mushrooms, molds, and yeasts (though yeast is a notable unicellular exception), are multicellular organisms composed of complex filamentous structures called hyphae. In contrast, Paramecium, bacteria, and Chlamydomonas are classic examples of single-celled organisms that perform all life functions within one cell.
Fungi is not a unicellular organism because the vast majority of fungi, such as mushrooms, molds, and yeasts (though yeast is a notable unicellular exception), are multicellular organisms composed of complex filamentous structures called hyphae. In contrast, Paramecium, bacteria, and Chlamydomonas are classic examples of single-celled organisms that perform all life functions within one cell.
Think of a unicellular organism like a 'studio apartment' where one room is the kitchen, bedroom, and living room all in one; multicellular organisms like fungi are like a 'multi-story house' where different specialized rooms (cells) serve different functions.
P-B-C-U: Paramecium, Bacteria, Chlamydomonas = Unicellular (mostly).
Biological organization is categorized by the number of cells constituting an organism. Unicellular organisms (e.g., bacteria, protists like Paramecium, and many algae like Chlamydomonas) exist as independent, single cells. Fungi, being part of their own kingdom, typically form multicellular mycelial networks, although yeast represents a unicellular subgroup within the kingdom.
Most fungi are multicellular, consisting of branching hyphae that form a mycelium.
Bacteria are prokaryotic unicellular organisms.
Paramecium is a ciliated, eukaryotic unicellular protist.
Chlamydomonas is a unicellular green alga with flagella.
Microbiological study of cell functions
Fungal research in ecology and medicine
While yeast (Saccharomyces cerevisiae) is a single-celled fungus, the term 'Fungi' as a broad category is defined by multicellularity in general biological classification contexts.
Wrong options: Paramecium, Bacteria, and Chlamydomonas are all quintessential examples of unicellular organisms.
C is correct тАФ Fungi are largely multicellular organisms, while the other choices are defined as unicellular organisms.
In competitive exams, always look for the exception in kingdom Fungi; remember that while most fungi are multicellular, yeast is a unicellular exception often tested to confuse students.
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