Out of nutrient cycles sulphur - (a) , phosphorus - (b) , carbon - (c) , and nitrogen (d) , the sedimentary cycle is/are :

Options

A. only
B. (b) and (d) only
C. (c) and only
D. (a) and (b) only

Answer

To solve the question regarding which nutrient cycles are sedimentary, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nutrient Cycles**:
- Nutrient cycles can be classified into two main types: sedimentary cycles and gaseous cycles.
- Sedimentary cycles involve nutrients that circulate in non-gaseous forms, primarily through the lithosphere (earth's crust).

2. **Identifying Sedimentary Nutrient Cycles**:
- **Sulfur Cycle**: Sulfur can exist in both gaseous and sedimentary forms. It is involved in sedimentary processes as it can be found in minerals and sediments.
- **Phosphorus Cycle**: Phosphorus is primarily found in the lithosphere and does not have a gaseous phase; thus, it is a sedimentary cycle.
- **Carbon Cycle**: The carbon cycle is predominantly a gaseous cycle, as carbon exists in the atmosphere as CO2.
- **Nitrogen Cycle**: The nitrogen cycle is also a gaseous cycle, as nitrogen exists in the atmosphere as N2.

3. **Conclusion**:
- Based on the classifications:
- Sulfur (A) - Sedimentary
- Phosphorus (B) - Sedimentary
- Carbon (C) - Gaseous
- Nitrogen (D) - Gaseous
- Therefore, the sedimentary cycles are sulfur (A) and phosphorus (B).

4. **Final Answer**:
- The correct option is **A and B only**.