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 where the genus and species names are identical. For example, "Malus malus" refers to the apple tree.

2. **Classification of Tautonyms**:
- Tautonyms are allowed in zoological nomenclature (the naming of animals) but are not accepted in botanical nomenclature (the naming of plants).

3. **Analyzing the Options**:
- The options provided are:
1. Tautonyms are not allowed in plants.
2. Tautonyms are not allowed in animals.
3. Tautonyms are normally allowed in animals and sometimes allowed in plants.
4. Tautonyms are allowed in bacteria.

4. **Evaluating Each Option**:
- **Option 1**: Tautonyms are not allowed in plants. (True)
- **Option 2**: Tautonyms are not allowed in animals. (False)
- **Option 3**: Tautonyms are normally allowed in animals and sometimes allowed in plants. (False)
- **Option 4**: Tautonyms are allowed in bacteria. (False)

5. **Conclusion**:
- The correct statement is that tautonyms are not allowed in plants.

### Final Answer:
- The true statement is: **Tautonyms are not allowed in plants.**