Read the following statements:
i. 51 % of carbon is found dissolved in oceans.
ii.The oceanic reservoir regulated the amount of carbon dioxide in the atmosphere.
iii. Some amount of the fixed carbon is lost to sediments and removed from circulation.
iv. Carbon constituents 49% of the dry weight of an organism and it is next only to water.

Options

A. i and ii are true but iii and iv are false
B. i and iii are true but ii and iv are false
C. ii and iii are true but i and iv are false
D. i and iv are correct but ii and ii are false

Answer

To analyze the statements provided in the question, we will evaluate each statement one by one to determine their validity.

### Step-by-Step Solution:

1. **Evaluate Statement i**: "51% of carbon is found dissolved in oceans."
- This statement is incorrect. The correct percentage of carbon found dissolved in oceans is approximately 71%, not 51%. Therefore, Statement i is false.

2. **Evaluate Statement ii**: "The oceanic reservoir regulated the amount of carbon dioxide in the atmosphere."
- This statement is correct. The oceans play a significant role in regulating atmospheric carbon dioxide levels by absorbing CO2 from the atmosphere. Thus, Statement ii is true.

3. **Evaluate Statement iii**: "Some amount of the fixed carbon is lost to sediments and removed from circulation."
- This statement is also correct. A portion of fixed carbon does indeed get sequestered in sediments, which removes it from the active carbon cycle. Therefore, Statement iii is true.

4. **Evaluate Statement iv**: "Carbon constitutes 49% of the dry weight of an organism and it is next only to water."
- This statement is incorrect. While carbon is a significant component of the dry weight of organisms, it does not constitute 49% of the dry weight; it is typically around 18-20%. Thus, Statement iv is false.

### Summary of Evaluations:
- Statement i: False
- Statement ii: True
- Statement iii: True
- Statement iv: False

### Conclusion:
The correct statements are ii and iii. Therefore, the answer to the question is that Statements ii and iii are true, while Statements i and iv are false.