Which statement is true?

Options

A. Tautonyms are not allowed in plants
B. Tautonyms are not allowed in animals
C. Tautonyms normally allowed in animals and sometimes allowed in plants
D. Tautonyms allowed only in bacteria

Answer

### Step-by-Step Solution:

1. **Understanding Tautonyms**:
- Tautonyms are scientific names of species where both parts of the name are identical in spelling.
- Example: Rattus Rattus (the black rat) where "Rattus" is both the genus and species name.

2. **Application of Tautonyms**:
- Tautonyms are specifically used in zoological nomenclature (the naming of animals).
- They are not permitted in botanical nomenclature (the naming of plants).

3. **Evaluating the Statements**:
- **Statement 1**: "Tautonyms are not allowed in plants."
- This statement is true since tautonyms are not used in the naming of plants.
- **Statement 2**: "Tautonyms are not allowed in animals."
- This statement is false because tautonyms are indeed allowed in animals.
- **Statement 3**: "Tautonyms are normally allowed in animals and sometimes allowed in plants."
- This statement is also false because tautonyms are never allowed in plants.

4. **Conclusion**:
- The only true statement is the first one: "Tautonyms are not allowed in plants."