Which of the following nouns is singular ?

Question

Accepted Answer

Explanation:

1. **Option 3: acquarium**  
   The word "acquarium" is a singular noun. It refers to a single tank or container where aquatic plants and animals are kept. The singular form is used when talking about one such container. The plural form of "acquarium" is "aquariums" or "aquaria," which would refer to multiple tanks or containers. Therefore, "acquarium" is correctly identified as a singular noun.

2. **Option 1: lice**  
   The word "lice" is the plural form of "louse," which is a small parasitic insect. When referring to more than one of these insects, the term "lice" is used. Since "lice" is plural, it is not the correct answer to the question asking for a singular noun.

3. **Option 2: geese**  
   The word "geese" is the plural form of "goose," which is a type of bird. When referring to more than one goose, the term "geese" is used. As "geese" is plural, it does not fit the requirement of being a singular noun.

4. **Option 4: bacteria**  
   The word "bacteria" is the plural form of "bacterium," which is a type of microorganism. When referring to multiple such microorganisms, "bacteria" is used. Since "bacteria" is plural, it is not the correct answer to the question asking for a singular noun.

In conclusion, "acquarium" is the only option among the given choices that is a singular noun, which is why Option 3 is the correct answer.