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 regarding which statement is incorrect among the provided options, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze Statement 1**:
- Statement: "The oceanic reservoirs regulate the amount of carbon dioxide in the atmosphere."
- Explanation: This statement is correct. Oceans absorb a significant amount of carbon dioxide (CO2) from the atmosphere, and through chemical reactions, they help regulate the levels of CO2. The oceans can hold more carbon than the atmosphere, which contributes to the regulation of atmospheric CO2 levels.

2. **Analyze Statement 2**:
- Statement: "It is estimated that 4 x 10^10 kg of carbon is fixed in the biosphere through photosynthesis annually."
- Explanation: This statement is incorrect. The actual estimated amount of carbon fixed through photosynthesis annually is around 4 x 10^13 kg, not 4 x 10^10 kg. Therefore, this statement is indeed incorrect.

3. **Analyze Statement 3**:
- Statement: "Of the total amount of global carbon, 71% carbon is found dissolved in oceans."
- Explanation: This statement is correct. A significant portion of the Earth's carbon is stored in the oceans, and it is estimated that around 71% of carbon is dissolved in oceanic waters.

4. **Analyze Statement 4**:
- Statement: "Carbon constitutes 49% of the dry weight of organisms."
- Explanation: This statement is also correct. Carbon is a major component of biological molecules and constitutes a large percentage of the dry weight of organisms, estimated at about 49%.

### Conclusion:
After analyzing all the statements, we find that:
- Statement 1: Correct
- Statement 2: Incorrect
- Statement 3: Correct
- Statement 4: Correct

Thus, the incorrect statement is **Statement 2**.

### Final Answer:
**The incorrect statement is Statement 2.**

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