The annual net primary productivity of the whole biosphere is approximately

Options

A. 150 bilion tons
B. 160 bilion tons
C. 170 bilion tons
D. 180 bilion tons

Explanation

To determine the annual net primary productivity of the whole biosphere, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Net Primary Productivity (NPP)**:
- Net Primary Productivity (NPP) is defined as the amount of organic matter (biomass) produced by photosynthetic organisms (producers) after accounting for the energy used in respiration.
- It can be expressed mathematically as:
\[ \text{NPP} = \text{Gross Primary Productivity (GPP)} - \text{Respiration} \]

2. **Consider the Scope of the Question**:
- The question asks for the NPP of the entire biosphere, which includes all ecosystems on Earth, such as terrestrial and aquatic environments.

3. **Define the Components of the Biosphere**:
- The biosphere comprises various components:
- Living beings (organisms)
- Atmosphere (air)
- Lithosphere (land)
- Hydrosphere (water)
- These components interact to support life and contribute to the overall productivity.

4. **Identify the Approximate Value**:
- According to scientific estimates, the annual net primary productivity of the whole biosphere is approximately 170 billion tons.
- It’s important to note that the oceans contribute about 55 billion tons to this total.

5. **Select the Correct Option**:
- Based on the information provided, the correct answer to the question is:
- **Option C: 170 billion tons**.

### Summary:
The annual net primary productivity of the whole biosphere is approximately **170 billion tons**.

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