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Which of the following organism(s) is/are not unicellular?
Amoeba
Plants
Paramoecium
Chlamydomonas
Plants
Plants are multicellular organisms composed of many eukaryotic cells organized into complex tissues and organs, whereas organisms like Amoeba, Paramecium, and Chlamydomonas are unicellular (consisting of only a single cell).
Plants are multicellular organisms composed of many eukaryotic cells organized into complex tissues and organs, whereas organisms like Amoeba, Paramecium, and Chlamydomonas are unicellular (consisting of only a single cell).
Think of a unicellular organism like a single-person business where one person handles everything (management, sales, accounting), while a plant is like a large multinational corporation with specialized departments and thousands of employees working together.
Remember 'ACAP' for Unicellular: Amoeba, Chlamydomonas, Amoeba, Paramecium (and yeast/bacteria). Plants are multicellular green giants!
Unicellular → 1 Cell (n=1)
Multicellular → Many Cells (n>1) with specialization
In multicellular organisms like plants, various cells undergo differentiation to form specialized tissues (e.g., xylem, phloem, parenchyma) that perform distinct physiological functions to sustain life. In contrast, unicellular organisms carry out all vital life processes—such as respiration, nutrition, excretion, and reproduction—within a single autonomous cell.
Unicellular organisms consist of a single independent cell capable of performing all life activities.
Amoeba, Paramecium, and Euglena are classic examples of unicellular protists.
Chlamydomonas is a unicellular green alga.
Plants and animals are complex multicellular eukaryotes with specialized organ systems.
High structural complexity in multicellular organisms allows division of labor and efficient functioning.
Study of cellular biology
Classification of kingdoms in biological taxonomy
| Feature | Unicellular (Amoeba) | Multicellular (Plants) |
|---|---|---|
Cell Number | Single Cell | Millions to Trillions of Cells |
Division of Labor | Organelles within one cell | Specialized tissues, organs, and systems |
Amoeba uses pseudopodia for movement and capturing food.
Paramecium is covered with cilia for locomotion.
Chlamydomonas possesses flagella and chloroplasts for photosynthesis.
B is correct — Plants are multicellular organisms, whereas Amoeba, Paramecium, and Chlamydomonas are unicellular organisms.
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