Select the incorrect statement.

Options

A. A genus comprises of a group of related species which has more characters in common in comparison to species of other genera.
B. Higher the category, greater is the difficulty of determining the relationship to other taxa at the same level.
C. Going higher from species to kingdom, the number of common characteristics goes on increasing.
D. All organisms, including plants and the animal kingdom, have species as the lowest category.

Answer

To solve the question "Select the incorrect statement," we will analyze each statement provided in the context of taxonomic hierarchy.

### Step-by-Step Solution:

1. **Understanding Taxonomic Hierarchy**:
- Taxonomic hierarchy is a system used to classify and organize living organisms into different categories. The main levels of this hierarchy are: Kingdom, Phylum, Class, Order, Family, Genus, and Species.

2. **Analyzing Statement 1**:
- "Genus comprises of a group of related species which has more characters in common in comparison to species of other genera."
- This statement is correct. A genus is indeed a grouping of species that share more characteristics with each other than with species from other genera.

3. **Analyzing Statement 2**:
- "Higher the category, greater is the difficulty of determining the relationship to other taxa at the same level."
- This statement is also correct. As we move up the taxonomic hierarchy, it becomes more complex to determine relationships because the categories encompass a broader range of organisms.

4. **Analyzing Statement 3**:
- "Going higher from species to kingdom, the number of common characters goes on increasing."
- This statement is incorrect. As we move from species to kingdom, the number of common characteristics actually decreases because a kingdom includes a wide variety of organisms that may not share many traits.

5. **Analyzing Statement 4**:
- "All organisms, including plants and the animal kingdom, have species as the lowest category."
- This statement is correct. In biological classification, species is recognized as the most specific level of classification for all organisms.

6. **Conclusion**:
- The only incorrect statement among the options provided is Statement 3.

### Final Answer:
The incorrect statement is: "Going higher from species to kingdom, the number of common characters goes on increasing."