Choose the correct answer :
Maximum net productivity in terrestrial ecosystems is found in :

Options

A. Rain forests
B. Deciduous forests
C. Mangrove plantation
D. Both (a) & (b)

Answer

To solve the question regarding which terrestrial ecosystem has the maximum net productivity, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Net Productivity**:
- Net Primary Productivity (NPP) is the rate at which all the autotrophs (like plants) in an ecosystem produce organic matter minus the rate at which they use some of that organic matter during respiration.

2. **Evaluate the Options**:
- **A. Rainforest**: Rainforests are known for their high biodiversity and dense vegetation, which contributes to high levels of photosynthesis and, consequently, high NPP.
- **B. Deciduous Forest**: Deciduous forests experience seasonal changes, including leaf shedding, which can lead to fluctuations in productivity. This results in a moderate NPP.
- **C. Mangrove Plantation**: Mangroves are found in coastal areas and can be productive, but their net productivity is often lower due to brackish water conditions and other environmental stresses.
- **D. Both A & B**: This option suggests that both rainforests and deciduous forests have high productivity, but we need to determine which one is higher.

3. **Analyze the Conditions**:
- Rainforests have a consistent climate, high rainfall, and do not experience significant leaf shedding, allowing for continuous high productivity.
- Deciduous forests, while productive, have periods of low productivity due to leaf shedding and seasonal changes.

4. **Conclusion**:
- After analyzing the options and their conditions, it is clear that the rainforest has the highest net productivity among the given options.

5. **Final Answer**:
- The correct answer is **A. Rainforest**.