Which of these is not a correct difference between carbon cycle and phosphorus cycle ?

Options

A. Carbon cycle is gaseous type of nutrient cycle while phosphorus cycle is a sedimentary type of nutrient cycle.
B. The reservoir of carbon is ocean while the reservoir of phosphorus is rock
C. In carbon cycle , there is respiratory release of carbon into atmosphere while this doesn't happen in phosphorus cycle
D. Atmospheric inputs of phosphorus through rainfall are much larger than carbon inputs

Answer

To determine which of the statements regarding the carbon cycle and phosphorus cycle is not correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding the Types of Cycles**:
- The carbon cycle is classified as a **gaseous cycle** because carbon exists in the atmosphere primarily in the form of carbon dioxide (CO2).
- The phosphorus cycle is classified as a **sedimentary cycle** because phosphorus is primarily found in the earth's crust and rocks, not in the atmosphere.

**Hint**: Remember the classification of cycles based on the state of the nutrient (gaseous vs. sedimentary).

2. **Identifying Reservoirs**:
- The statement claims that the carbon reservoir is the ocean, while the phosphorus reservoir is the rock.
- This is correct because a significant amount of carbon is dissolved in the ocean, and phosphorus is predominantly found in rocks.

**Hint**: Think about where each nutrient is stored in nature.

3. **Respiratory Release**:
- The statement mentions that in the carbon cycle, respiratory release occurs (organisms release CO2), while in the phosphorus cycle, there is no significant release of phosphorus into the atmosphere.
- This statement is also correct. Carbon dioxide is released during respiration, but phosphorus does not have a gaseous form that is released into the atmosphere.

**Hint**: Consider the metabolic processes of living organisms and how they interact with these cycles.

4. **Atmospheric Input**:
- The last statement claims that atmospheric input of phosphorus is more in comparison to carbon. This is incorrect.
- In reality, phosphorus does not have a significant gaseous form and does not enter the atmosphere in substantial amounts, unlike carbon, which is constantly exchanged with the atmosphere.

**Hint**: Compare how each nutrient enters the atmosphere and consider the nature of their cycles.

### Conclusion:
The statement that is not correct is that **"atmospheric input of phosphorus is more in comparison to carbon."** This is incorrect because phosphorus does not significantly enter the atmosphere, while carbon does through processes like respiration and combustion.

### Final Answer:
**The incorrect statement is: "Atmospheric input of phosphorus is more in comparison to carbon."**