Which of the following pairs is a sedimentary type of biogeochemical cycle?a)Oxygen and nitrogenb)Phosphorus and sulphurc)Phosphorus and nitrogend)Phosphorus and carbon dioxideCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Biogeochemical cycles are of two types: (i) Gaseous : Biogenetic materials involved in circulation, are gaseous e.g. N₂, 0₂, C0₂ etc.
(ii) Sedimentary: Biogenetic materials involved in circulation, arenon-gaseous e.g. P, Ca, S etc. forms rocks.

Answer

Carbon ,nitrogen, oxygen are present in atmosphere they involve only in gaseous cycle whereas phosphorous ans sulphur are present in rocks as sediments and they get recycled in nature by sedimentary cycle so option b is correct answer

Answer

Carbon , nitrogen and oxygen are gaseous in nature but phosphorus and sulphur can exist in solidified nature that's why P And S cycle can occur in sedmenatry rocks. For more detail refer ncert class 12 page no.254

Answer

Sedimentary biogeochemical cycles involve the transfer of elements between the atmosphere, biosphere, lithosphere, and hydrosphere through the processes of weathering, erosion, sedimentation, and burial. These cycles are characterized by the formation of sedimentary rocks, which act as reservoirs for the elements involved.

In the given options, the pair that represents a sedimentary type of biogeochemical cycle is Phosphorus and Sulphur.

Explanation:
- Phosphorus Cycle:
The phosphorus cycle is a sedimentary cycle that primarily involves the transfer of phosphorus between the lithosphere (rocks and minerals), biosphere (plants and animals), and hydrosphere (water bodies). Phosphorus is released into the environment through the weathering of rocks and minerals. It then enters the biotic components of ecosystems through uptake by plants, which are consumed by animals. Upon death and decomposition, phosphorus returns to the soil or water bodies, where it can be incorporated into sediments over time. Through geological processes, these sediments can eventually form phosphorus-rich rocks, completing the sedimentary cycle.

- Sulphur Cycle:
The sulphur cycle also involves a sedimentary component. Sulphur is released into the atmosphere through natural processes such as volcanic emissions and the decay of organic matter. It then undergoes various chemical reactions in the atmosphere before being deposited back onto the Earth's surface through precipitation or dry deposition. Sulphur can accumulate in soils, water bodies, and sedimentary rocks over time. This sedimentary reservoir acts as a long-term storage of sulphur, and the release of sulphur from these rocks can occur through weathering and erosion.

The other options:
- Oxygen and Nitrogen: The oxygen and nitrogen cycles are primarily gaseous cycles and do not involve significant sedimentary processes. They mainly involve the exchange between the atmosphere and living organisms.

- Phosphorus and Nitrogen: While both phosphorus and nitrogen cycles involve sedimentary components, the nitrogen cycle is primarily a gaseous cycle, with nitrogen gas (N2) being the dominant form in the atmosphere. Nitrogen undergoes various transformations, including fixation, nitrification, and denitrification, but does not have a significant sedimentary reservoir. Phosphorus, on the other hand, has a prominent sedimentary component as explained earlier.

- Phosphorus and Carbon Dioxide: The carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere, biosphere, and oceans. It does not have a significant sedimentary component, as carbon dioxide is primarily a gaseous form. Phosphorus, as discussed earlier, has a sedimentary cycle but does not directly interact with carbon dioxide in a sedimentary manner.

Hence, the correct answer is option B: Phosphorus and Sulphur, as both cycles involve sedimentary processes.

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