For frugivorous birds and mammals in the tropical forests of different continents the slope is found to be
(a) 0.6
(b) 1.3
(c) 1.15
(d) 1.7

Options

A. 0.6
B. 1.3
C. 1.15
D. 1.7

Explanation

To solve the question regarding the slope for frugivorous birds and mammals in the tropical forests of different continents, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the slope (z value) related to frugivorous birds and mammals in tropical forests across different continents. This slope indicates the relationship between species richness and area.

2. **Background Knowledge**: The concept of the slope (z value) comes from the work of Alexander von Humboldt, who studied the relationship between species richness and area. He proposed that as the area increases, the species richness also increases, but this relationship has a limit.

3. **Logarithmic Relationship**: The relationship can be expressed in a logarithmic form:
\[ \log S = \log C + z \log A \]
where \( S \) is species richness, \( C \) is the y-intercept, \( A \) is the area, and \( z \) is the slope.

4. **Identifying the Slope Values**: For smaller areas, the z value ranges from 0.1 to 0.2. However, when considering larger areas or different continents, the z value increases and typically falls between 0.6 and 1.2.

5. **Choosing the Correct Option**: Among the given options (0.6, 1.3, 1.15, 1.7), we need to identify which value falls within the range of 0.6 to 1.2. The only option that fits this criterion is **1.15**.

6. **Conclusion**: Therefore, the correct answer to the question is (c) 1.15.

### Final Answer:
(c) 1.15