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 determine which of the nutrient cycles are sedimentary among the given options (sulphur, phosphorus, carbon, and nitrogen), we need to understand the definitions and characteristics of sedimentary and gaseous cycles.

### Step-by-Step Solution:

1. **Understanding Nutrient Cycles**:
- Nutrient cycles can be classified into two main types: gaseous cycles and sedimentary cycles.
- Gaseous cycles involve nutrients that are primarily found in the atmosphere, while sedimentary cycles involve nutrients that are found in the earth's crust.

2. **Identifying Gaseous Cycles**:
- Examples of gaseous cycles include:
- **Nitrogen Cycle**: Nitrogen is abundant in the atmosphere and cycles through various forms (N2, NH3, NO3-).
- **Carbon Cycle**: Carbon is also present in the atmosphere in the form of CO2 and is involved in photosynthesis and respiration.

3. **Identifying Sedimentary Cycles**:
- Examples of sedimentary cycles include:
- **Sulphur Cycle**: Sulphur is primarily found in rocks and minerals and cycles through the earth's crust.
- **Phosphorus Cycle**: Phosphorus is also found in rocks and does not have a gaseous phase; it cycles through soil, water, and living organisms.

4. **Analyzing the Options**:
- (a) Sulphur: Sedimentary cycle
- (b) Phosphorus: Sedimentary cycle
- (c) Carbon: Gaseous cycle
- (d) Nitrogen: Gaseous cycle

5. **Conclusion**:
- The sedimentary cycles among the options provided are (a) Sulphur and (b) Phosphorus.

### Final Answer:
The sedimentary cycles are (a) Sulphur and (b) Phosphorus.