Which of the following is/are the structural character/s of an ecosystem ?
Dominance , species composition, stratification, Nutrient cycle , Food Web complexity , productivity

Options

A. Dominance , species composition, stratification
B. Nutrient cycle, Food Web complexity Productivity
C. Nutrient cycle, Dominance , Productivity
D. Dominance , Nutrient cycle , Species composition

Answer

To determine the structural characteristics of an ecosystem from the given options, we can analyze each term one by one:

1. **Dominance**: This refers to the presence of certain species that are more abundant or have a greater biomass in a particular ecosystem. Dominance is a structural characteristic because it indicates which species are most influential in shaping the ecosystem.

2. **Species Composition**: This term describes the variety and abundance of different species within an ecosystem. It is a key structural characteristic as it helps define the biodiversity and ecological interactions present.

3. **Stratification**: This refers to the vertical layering of different species in an ecosystem, particularly in forests where different layers (canopy, understory, forest floor) host different species. Stratification is also a structural characteristic as it shows how species are organized in space.

4. **Nutrient Cycle**: While important for ecosystem function, nutrient cycling describes processes and interactions rather than the structural aspects of an ecosystem. Therefore, it is not considered a structural characteristic.

5. **Food Web Complexity**: This describes the interconnections between different species and their feeding relationships. Like nutrient cycling, it focuses on interactions rather than structure, so it is not a structural characteristic.

6. **Productivity**: This refers to the rate at which energy is produced in an ecosystem (e.g., through photosynthesis). It is more about ecosystem function than structure.

Based on this analysis, the structural characteristics of an ecosystem from the options provided are:

- Dominance
- Species Composition
- Stratification

Thus, the correct answer is **option A**: Dominance, Species Composition, and Stratification.