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 given in the question, we will evaluate each statement one by one and determine their validity.

### Step-by-Step Solution:

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

- **Statement ii:** "The oceanic reservoir regulated the amount of carbon dioxide in the atmosphere."
- **Evaluation:** This statement is correct. The oceans play a significant role in regulating atmospheric carbon dioxide levels through processes like absorption and release of CO2.
- **Conclusion:** **True**

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

- **Statement iv:** "Carbon constitutes 49% of the dry weight of an organism and it is next only to water."
- **Evaluation:** This statement is incorrect. While carbon is a major component of living organisms, it does not constitute 49% of the dry weight; it is actually around 18-20%. Water constitutes a larger percentage of an organism's weight.
- **Conclusion:** **False**

2. **Summarizing the Truth Values:**
- Statement i: False
- Statement ii: True
- Statement iii: True
- Statement iv: False

3. **Identifying the Correct Option:**
- Based on the evaluations, the correct option is that statements ii and iii are true, while statements i and iv are false.

### Final Answer:
The correct answer is that the 2nd and 3rd statements are true, while the 1st and 4th statements are false.

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