Find out the false one?

Options

A. The barnacle Chthamalus has a larger niche when Balanus is absent.
B. The niches of the two barnacles are not the same in intertidal zone
C. The presence or absence of each species affect the niche of the other
D. None

Answer

To solve the question "Find out the false one?" regarding the statements about Balanus and Chthamalus, we will analyze each statement based on Connell's field experiment and the competitive interactions between these two barnacle species.

### Step-by-Step Solution:

1. **Understanding the Species**:
- Balanus is a larger barnacle species, while Chthamalus is smaller. This size difference plays a crucial role in their competition for space in the intertidal zone.

2. **Analyzing the First Statement**:
- The first statement claims that "Chthamalus has larger niches when Balanus is absent." This is true because when Balanus is not present, Chthamalus can occupy a larger niche due to reduced competition.

3. **Analyzing the Second Statement**:
- The second statement asserts that "The niches of the two barnacles are not the same in the intertidal zone." This is also true. Balanus occupies a different niche than Chthamalus, mainly due to its larger size and competitive superiority.

4. **Analyzing the Third Statement**:
- The third statement states that "The presence and absence of each species affects the niches of the other." This statement is correct as well. The presence of Balanus can limit the niche space available for Chthamalus, and vice versa.

5. **Conclusion**:
- After analyzing all three statements, we find that all of them are true. Therefore, there is no false statement among the options provided. Thus, the answer to the question is that none of the statements are false.

### Final Answer:
None of the statements are false.