Which of the following are "unicellular" organisms?
(A) Plasmodium
(B) Protoza
(C) Spirogyra
(D) Leishmania
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (B) and (D) only
In biological classification, organisms are grouped based on whether they consist of a single cell (unicellular) or multiple cells (multicellular).
Based on the scientific classification of the organisms listed:
- (A) Plasmodium: This is a genus of unicellular eukaryotes that are obligate parasites, famously known for causing malaria.
- (B) Protozoa: This is a broad group of unicellular eukaryotic organisms that exhibit animal-like behaviors, such as motility and predation.
- (C) Spirogyra: This is a genus of filamentous green algae. While each individual cell is an independent unit, they are physically connected end-to-end to form long, multicellular filaments. In most competitive exams and biological contexts, it is classified as a multicellular organism.
- (D) Leishmania: This is a genus of unicellular protozoan parasites responsible for the disease leishmaniasis.