Biological Classification

To solve the problem, we need to learn about the different kingdoms in biological classification and understand which organism belongs to which kingdom.

1. What are Biological Kingdoms?

Scientists classify all living things into groups called kingdoms based on their characteristics. The main kingdoms are:

• Plantae: Includes all plants, which can make their own food using sunlight.
• Animalia: Includes all animals, which consume other organisms for food.
• Fungi: Includes mushrooms, molds, and yeast, which absorb nutrients from other organisms.
• Protista: Mostly single-celled organisms that don’t fit well into plants, animals, or fungi.
• Monera: Includes bacteria and blue-green algae (cyanobacteria), which are simple single-celled organisms without a nucleus.

2. Analyze Each Organism:

• Amoeba: It is a single-celled organism that moves by changing its shape (using pseudopodia). Amoeba does not have the characteristics of plants, so it does not belong to Plantae. Amoeba is classified under Protista.
• Euglena: Euglena is a single-celled organism that can make food like plants (using sunlight) but also moves like animals. Because it has characteristics of both plants and animals but is single-celled, it belongs to Protista, not Fungi.
• Paramecium: Paramecium is a single-celled organism with tiny hair-like structures called cilia to help it move. It belongs to the kingdom Protista. This match is correct.
• Nostoc: Nostoc is a type of blue-green algae, also called cyanobacteria. It is a simple organism without a nucleus, classified under the kingdom Monera, not Animalia.

3. Conclusion:

Among the options given, only the pair Paramecium - Protista is correctly matched.

Final Answer:

The correctly matched pair is Paramecium - Protista.