Highest rate of primary productivity is found in

Options

A. agricultural ecosystems
B. coral reef community
C. grasslands
D. deserts

Answer

To determine where the highest rate of primary productivity is found, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Primary Productivity**:
- Primary productivity refers to the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances. It is measured as the amount of biomass produced in a given area over a specific time period.

2. **Identifying Ecosystems**:
- The question provides four different ecosystems: agricultural ecosystems, coral reef community, grasslands, and deserts. We need to evaluate these ecosystems based on their productivity.

3. **Evaluating Each Ecosystem**:
- **Agricultural Ecosystems**: These can have high productivity due to human intervention, but they are not as productive as natural ecosystems.
- **Coral Reef Community**: Coral reefs are known for their high biodiversity and complex structures, which support a large number of species and high rates of productivity.
- **Grasslands**: These ecosystems have moderate productivity, primarily due to their vegetation types and climatic conditions.
- **Deserts**: Deserts typically have low productivity due to limited water availability and harsh conditions.

4. **Conclusion**:
- After evaluating the ecosystems, it is clear that the coral reef community has the highest rate of primary productivity among the options provided. This is due to its structural complexity and the abundance of photosynthetic organisms.

5. **Final Answer**:
- The highest rate of primary productivity is found in the **coral reef community**.