Select the incorrect statement

Options

A. Museums often have collections of skeletons
B. Separate taxonomic keys are required for each taxonomic category
C. Taxonomic keys are based on the contrasting characters
D. Monograph is useful in providing information for identifications of names of species found in an area

Answer

To determine the incorrect statement among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Option 1: Museums often have collections of skeletons.**
- Museums are institutions that collect and preserve various types of specimens, including skeletons. They also house artistic and educational materials. This statement is correct.

2. **Option 2: Separate taxonomic keys are required for each taxonomic category.**
- Taxonomic keys are tools used to identify organisms based on their characteristics. Each taxonomic category (like genus, species, family) requires its own key to facilitate identification. This statement is also correct.

3. **Option 3: Taxonomic keys are based on contrasting characters.**
- Taxonomic keys utilize contrasting characters (also known as leads) to help in the identification process. A pair of contrasting characters is referred to as a couplet. This statement is correct as well.

4. **Option 4: Monograph is useful in providing information for identification of names of species found in an area.**
- A monograph provides detailed information about a specific taxon, such as a family or genus, but it does not specifically focus on all species found in a particular area. Therefore, this statement is incorrect.

### Conclusion:
The incorrect statement is **Option 4**.