Among the following statements, incorrect statement is

Options

A. The oceanic reservoir regulate the amount of carbon dioxide in the atmosphere
B. It is estimated that `4 xx 10^(10)` kg of carbon is fixed in the biosphere through photosynthesis annually
C. Of the total quantity of global carbon, 71% carbon is found dissolved in ocean
D. Carbon constitutes 49% of the dry weight of organism and is next to the water

Answer

To solve the question, we need to evaluate each of the four statements provided and identify the incorrect one. Let’s analyze them step by step.

### Step 1: Analyze the First Statement
**Statement 1:** "The oceanic reservoir regulates the amount of carbon dioxide in the atmosphere."
- **Evaluation:** This statement is true. Oceans act as a significant reservoir for carbon dioxide, absorbing a large amount of CO2 from the atmosphere, thus helping to regulate atmospheric levels.

### Step 2: Analyze the Second Statement
**Statement 2:** "It is estimated that 4 × 10^10 kg of carbon dioxide is fixed in the biosphere through photosynthesis annually."
- **Evaluation:** This statement is incorrect. The actual estimated amount of carbon dioxide fixed in the biosphere through photosynthesis is approximately 4 × 10^13 kg annually, not 4 × 10^10 kg.

### Step 3: Analyze the Third Statement
**Statement 3:** "Of the total quantity of global carbon, 71% carbon is found dissolved in the ocean."
- **Evaluation:** This statement is true. It is widely accepted that about 71% of the Earth's carbon is stored in the oceans, primarily in dissolved forms.

### Step 4: Analyze the Fourth Statement
**Statement 4:** "Carbon constitutes 49% of the dry weight of organisms and is next to water."
- **Evaluation:** This statement is also true. Carbon is a major component of living organisms, making up about 49% of their dry weight, second only to water.

### Conclusion
After evaluating all four statements, we find that the second statement is incorrect. Therefore, the answer to the question is:

**Incorrect Statement:** Statement 2

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