Out of the following biogeochemical cycles which one is gaseous
I.sulphur
II.phosphorus
III.nitrogen
IV.carbon
Choose the correct option

Options

A. only I
B. only II
C. ONLY IV
D. III and IV

Answer

To determine which of the given biogeochemical cycles are gaseous, we need to analyze each option:

1. **Sulphur Cycle**: The sulphur cycle is primarily a sedimentary cycle. Sulphur is found in rocks and minerals, and its cycle involves processes such as weathering, volcanic eruptions, and the decomposition of organic matter. Therefore, it is not a gaseous cycle.

2. **Phosphorus Cycle**: The phosphorus cycle is also a sedimentary cycle. Phosphorus is mainly found in rocks and soil, and it does not have a significant gaseous phase in its cycle. Thus, it is not a gaseous cycle.

3. **Nitrogen Cycle**: The nitrogen cycle is a gaseous cycle. Nitrogen is abundant in the atmosphere (about 78% of the air we breathe) and undergoes various processes such as nitrogen fixation, nitrification, and denitrification. Therefore, it is a gaseous cycle.

4. **Carbon Cycle**: The carbon cycle is also a gaseous cycle. Carbon exists in the atmosphere as carbon dioxide and is exchanged between the atmosphere, oceans, and living organisms through processes like photosynthesis and respiration.

Based on this analysis, the gaseous cycles among the options provided are:

- **III. Nitrogen**
- **IV. Carbon**

Thus, the correct answer is **III and IV**.