Which of the following ecosystem is least productive ?

Options

A. Deep oceans
B. Moist forest
C. Shallow oceans
D. Grasslands

Answer

To determine which ecosystem is least productive among the given options, we need to analyze each ecosystem based on its productivity characteristics. Here’s a step-by-step solution:

### Step 1: Understand Ecosystem Productivity
Ecosystem productivity refers to the rate at which energy is produced and stored in the form of biomass by producers (like plants and phytoplankton) through photosynthesis. Factors affecting productivity include sunlight availability, nutrient levels, and recovery of resources.

### Step 2: Analyze Each Option
1. **Deep Oceans**:
- **Sunlight**: Very limited sunlight penetrates to deep ocean levels, which restricts photosynthesis.
- **Nutrients**: While deep oceans may have nutrients, the lack of sunlight means that primary production is minimal.
- **Resource Recovery**: Difficult due to depth and conditions.
- **Conclusion**: Likely the least productive.

2. **Moist Forest**:
- **Sunlight**: Ample sunlight supports high rates of photosynthesis.
- **Nutrients**: Rich in nutrients, promoting high productivity.
- **Resource Recovery**: Easy due to the biodiversity and structure of the forest.
- **Conclusion**: Highly productive.

3. **Shallow Oceans**:
- **Sunlight**: Sufficient sunlight supports photosynthesis.
- **Nutrients**: Generally nutrient-rich, promoting high productivity.
- **Resource Recovery**: Easier due to proximity to the surface.
- **Conclusion**: Highly productive.

4. **Grasslands**:
- **Sunlight**: Adequate sunlight for photosynthesis.
- **Nutrients**: Moderate nutrient levels, but still supports productivity.
- **Resource Recovery**: Relatively easy for growth and recovery.
- **Conclusion**: Moderately productive.

### Step 3: Compare the Options
- **Deep Oceans**: Least productive due to lack of sunlight and difficulty in resource recovery.
- **Moist Forest**: Highly productive.
- **Shallow Oceans**: Highly productive.
- **Grasslands**: Moderately productive.

### Step 4: Final Conclusion
Based on the analysis, the ecosystem that is least productive is **Option A: Deep Oceans**.

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