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Which of the following are "unicellular" organisms?

(A) Plasmodium

(B) Protoza

(C) Spirogyra

(D) Leishmania

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 2

(A) Plasmodium → Unicellular parasitic protozoan that causes malaria.

(B) Protozoa → Single-celled eukaryotic organisms by definition.

(C) Spirogyra → Multicellular filamentous green algae forming chains of cells.

(D) Leishmania → Unicellular parasitic protozoan that causes leishmaniasis.


Hence, Option 2: (A), (B) and (D) only → Spirogyra is the only multicellular organism among the given options as it exists as filamentous colonies, while Plasmodium, Protozoa, and Leishmania are all unicellular protozoans → correct

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