Annually, 1 ha of a healthy forest will

Options

A. Produce 10 ton of `O_(2)` and absorb 10 ton of `CO_(2)`
B. Produce 20 ton of `O_(2)` and absorb 20 ton of `CO_(2)`
C. Produce 10 ton of `O_(2)` and absorb 30 ton of `CO_(2)`
D. Produce 30 ton of `O_(2)` and absorb 30 ton of `CO_(2)`

Answer

To solve the question regarding the annual production and absorption of gases by 1 hectare of a healthy forest, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the annual production of oxygen and absorption of carbon dioxide by 1 hectare of a healthy forest.

2. **Identify the Options**: We have four options to consider:
- Option A: Produces 10 tons of oxygen and absorbs 10 tons of carbon dioxide.
- Option B: Produces 20 tons of oxygen and absorbs 20 tons of carbon dioxide.
- Option C: Produces 10 tons of oxygen and absorbs 30 tons of carbon dioxide.
- Option D: Produces 30 tons of oxygen and absorbs 30 tons of carbon dioxide.

3. **Consider the Characteristics of a Healthy Forest**: A healthy forest, such as the Amazon rainforest, is known for its high productivity in terms of oxygen production and carbon dioxide absorption.

4. **Analyze the Balance of Gases**: In a healthy ecosystem, the process of photosynthesis produces oxygen while respiration consumes oxygen and releases carbon dioxide. A healthy forest typically has a net positive balance, meaning it produces more oxygen than it consumes and absorbs more carbon dioxide than it releases.

5. **Evaluate Each Option**:
- **Option A**: Produces 10 tons of oxygen and absorbs 10 tons of carbon dioxide. This indicates no net gain, which is unlikely for a healthy forest.
- **Option B**: Produces 20 tons of oxygen and absorbs 20 tons of carbon dioxide. Again, this suggests a balance but not a net gain.
- **Option C**: Produces 10 tons of oxygen and absorbs 30 tons of carbon dioxide. This indicates a net gain of carbon absorption, which is characteristic of a healthy forest.
- **Option D**: Produces 30 tons of oxygen and absorbs 30 tons of carbon dioxide. This also suggests a balance but does not reflect the high absorption capacity.

6. **Select the Best Option**: Based on the analysis, Option C (produces 10 tons of oxygen and absorbs 30 tons of carbon dioxide) is the most accurate representation of a healthy forest's capabilities.

7. **Conclusion**: Therefore, the correct answer is that annually, 1 hectare of a healthy forest will produce 10 tons of oxygen and absorb 30 tons of carbon dioxide.