Which of the following will relate to vertical distribution of different species occupying different levels of ecosystem ?

Options

A. Physiognomy
B. Pyramid of numbers
C. Stratification
D. Succession

Answer

To solve the question regarding the vertical distribution of different species occupying different levels of an ecosystem, we need to analyze the options provided: physiognomy, pyramids of numbers, stratification, and succession.

### Step-by-Step Solution:

1. **Understanding Ecosystem Structure**:
- An ecosystem consists of both biotic (living organisms) and abiotic (non-living elements) components. The arrangement and interaction of these components can vary significantly.

**Hint**: Consider how species are organized in their environment.

2. **Defining Vertical Distribution**:
- Vertical distribution refers to how different species occupy various heights or layers within an ecosystem. This is particularly evident in forest ecosystems where different plants and animals thrive at different levels.

**Hint**: Think about how trees, shrubs, and grasses are arranged in a forest.

3. **Analyzing the Options**:
- **Physiognomy**: This term refers to the overall appearance and structure of vegetation, including its vertical arrangement, but it does not specifically denote the distribution of species at different levels.
- **Pyramids of Numbers**: This concept relates to the number of organisms at different trophic levels in an ecosystem, not their vertical distribution.
- **Stratification**: This term specifically refers to the layering of different species in an ecosystem, such as trees at the top, followed by shrubs, and then grasses at the bottom. This is the correct term that describes vertical distribution.
- **Succession**: This is the process by which the structure and composition of a community change over time, but it does not directly relate to the vertical distribution of species at a given moment.

**Hint**: Focus on which term directly relates to the concept of layers in an ecosystem.

4. **Conclusion**:
- Based on the definitions and analysis, the correct answer is **stratification**. This term directly relates to the vertical distribution of different species occupying different levels of an ecosystem.

**Final Answer**: Stratification