Tropics (`23.5^(@)N` to `23.5^(@)S`) have________species as compared to temperature or polar regions.
(a) less
(b) equal
(c) more
(d) none of these

Options

A. less
B. equal
C. more
D. none of these

Explanation

To solve the question regarding species diversity in the tropics compared to temperate or polar regions, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Tropics**: The tropics are defined as the regions between 23.5°N and 23.5°S latitude. This area is characterized by a warm climate and relatively stable environmental conditions throughout the year.

2. **Species Diversity and Latitude**: Research in ecology indicates that species diversity tends to increase as one moves from the poles towards the equator. This is known as the latitudinal diversity gradient.

3. **Factors Influencing Species Diversity**:
- **Ecological Obstacles**: In the tropics, there are fewer ecological obstacles such as extreme temperatures, seasonal variability, and moisture extremes that can limit species diversity.
- **Stable Climate**: The stable climate in the tropics supports a wide variety of habitats, which in turn allows for a greater number of species to thrive.

4. **Comparison with Temperate and Polar Regions**: In contrast, temperate and polar regions experience more significant ecological obstacles (e.g., harsher climates, seasonal changes, and limited resources) that restrict the number of species that can survive there.

5. **Conclusion**: Given that the tropics have fewer ecological obstacles and a more stable environment, they support a greater number of species compared to temperate and polar regions.

6. **Final Answer**: Therefore, the correct answer to the question is (c) more.