Correct Option
The correct option is
Only two pairs
Explanation
Microorganisms are a diverse group of organisms classified into major categories such as bacteria, fungi, protozoa, and algae. This classification is based on cellular structure, mode of nutrition, and other biological characteristics. In the context of human welfare, specific genera from these groups are utilized for industrial and medicinal purposes.
Statement-wise Analysis
- Pair 1: Aspergillus : Algae – Incorrect
Aspergillus is a genus of Fungi (specifically a mold), not algae. It is multicellular and heterotrophic. In industrial microbiology, Aspergillus niger is extensively used for the commercial production of citric acid. - Pair 2: Paramecium : Protozoa – Correct
Paramecium is a unicellular, eukaryotic organism classified under Protozoa. It is specifically a ciliated protozoan found in freshwater environments and is distinct from bacteria or fungi. - Pair 3: Penicillium : Fungi – Correct
Penicillium is a genus of Fungi (mold). It is historically and medically significant as the source of penicillin, the first antibiotic discovered by Alexander Fleming. - Pair 4: Spirogyra : Bacteria – Incorrect
Spirogyra is a filamentous green Algae found in fresh water. It possesses chlorophyll and performs photosynthesis, distinguishing it from bacteria, which are prokaryotic organisms.
Conclusion: Only Pair 2 and Pair 3 are correctly matched.
Key Takeaway
Aspergillus and Penicillium are Fungi used in industry and medicine; Spirogyra is an Algae; and Paramecium is a Protozoan. Correct taxonomic identification is essential for understanding the industrial application of microbes.