Nutrient cycles - class-IX

The reservoir for gaseous type of nutrient cycles, e.g., nitrogen, carbon cycle exist in the atmosphere.

A biogeochemical cycle involves biological, geological and chemical factors. The circulation of chemical nutrients like carbon, oxygen, nitrogen, phosphorus, calcium, and water, etc. between biotic and abiotic components of the biosphere is known as a biogeochemical cycle.
So, the correct option is option A.

Biogeochemical cycles involves the exchange of minerals between abiotic and biotic components of the biosphere. It is mainly of three types hydrological, gaseous and sedimentary.
Gaseous cycle involves the transportation of matter through the atmosphere. Some examples of the gaseous cycle are carbon cycle, nitrogen cycle, oxygen cycle.
So, the correct answer is option A.

The term biogeochemical cycle is used for exchange or circulation of biogenetic nutrients between living and nonliving components of biosphere. Cycling of biogenetic nutrients is an important characteristic of an ecosystem. 

The term biogeochemical cycles is used for exchange or circulation of biogenetic nutrients between living and nonliving components of biosphere. Biogenetic nutrients are essential elements required by organisms for their body building and metabolism, which are provided by earth and returned to earth after their death by the decomposition activity of decomposers. If decomposition is not carried out then biogenetic nutrients will slowly become locked up in the bodies of plants and animals and ultimately the biogeochemical cycles will stop.

Phosphorus and sulfur both have sedimentary biogeochemical cycles - they cycle through rocks, soil, and sediments. Carbon and oxygen have gaseous cycles (CO2 in atmosphere). Nitrogen has a predominantly gaseous cycle (N2 atmosphere). The correct pair is phosphorus and sulfur.

Decomposers are saprotrophs, which decompose the organic remains by secreting extracellular digestive enzymes. Due to degradation of organic remains, decomposers are also called as reducers. They are also known as mineralisers as they release minerals trapped in organic remains. Detrivores are decomposers as well as scavengers, e.g., earthworm. Decomposition of organic wastes and dead and decaying plants and animals returns the minerals locked in living systems back to the environment. Thus, decomposition is very important for the biogeochemical cycles, or nutrient cycling.

Nitrogen is essential for producing proteins (amino acids contain nitrogen) and nucleic acids (DNA/RNA nitrogenous bases). While carbon and oxygen are also crucial, nitrogen is specifically required for these macromolecules. Water is a solvent, not a building block.

Biogeochemical cycles like carbon, nitrogen, and sulphur have gaseous phases where elements circulate through the atmosphere. The phosphorus cycle is different - it's a sedimentary cycle that moves through soil, water, and rock but doesn't have a significant atmospheric gaseous phase.

Biogeochemical cycles refer to the movement of chemical elements between living organisms and the non-living environment (atmosphere, hydrosphere, lithosphere). The term combines 'bio' (living organisms), 'geo' (earth/rocks), and 'chemical' (chemical processes).

Nutrient cycling is defined as the circulation or cycling of elements in an ecosystem. It is an essential process of an ecosystem. In this, a particular nutrient or element is transferred from environment to one living being to another living being and comes back to the environment. The various elements include carbon, nitrogen, sulphur, phosphorous, etc. 

In ecosystem, cycling of nutrients is called biogeochemical cycle. In this, essential nutrients moves through biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments in an ecosystem. The various biogeochemical cycle includes carbon cycle, nitrogen cycle, phosphorous cycle, oxygen cycles. 

In earth science, a biogeochemical cycle or substance turn over or cycling of substances is a pathway by which a chemical substance moves through both biotic and abiotic (lithosphere, atmosphere and hydrosphere) compartments of Earth. A cycle is a series of change, which comes back to the starting point and which can be repeated.

The utilisation of elements and compounds in nature and their subsequent return to the environment is called material cycles. It is also called as a biogeochemical cycle. 
In biology, a life cycle is a series of changes in form that an organism undergoes, returning to the starting state.
Recycle is the conversion of waste into useful forms.
Cyclic pathways tend to use the last product they create to re-begin the cycle. 

Biogeochemical cycle is a pathway by which a chemical substance moves through both biotic and abiotic compartments of earth. The circulation of chemical nutrients like carbon, oxygen, nitrogen, phosphorus, calcium and water, etc., through the biological and physical world are known as biogeochemical cycles. In effect, the element is recycled, although in some cycles there may be places where the element is accumulated or held for a long period of time.

Phosphorus cycle is an example for sedimentary cycle. 

A biogeochemical cycle or inorganic-organic cycle is a circulating or repeatable pathway by which either a chemical element or a molecule moves through both biotic (bio-) and abiotic (geo-) compartments of an ecosystem. 

The ocean represents a major reservoir of sulphur on earth, with large quantities in the form of dissolved sulphate and sedimentary minerals (e.g., gypsum and pyrite). Sulphate is the most stable form of sulphur on earth; weathering and leaching of rocks and sediments are its main sources to the ocean. The majority of sulphur is found in seawater or sedimentary rocks especially pyrite rich shales and evaporite rocks. 

Biogeochemical cycles may also be referred to as cycles of matter because they link together all organisms and abiotic features on earth. Matter is continually recycled among living and abiotic elements on earth. Biogeochemical cycles facilitate the transfer of matter from one form to another and from one location to another on planet earth.

Biogeochemical cycles are the nutrient cycles. These are the cycles which are responsible for the recycling of the nutrients. The chemical cycles are necessary for the metabolism and maintenance of the organisms in the ecosystem. Biome is a collection of many ecosystems. The nutrient recycling takes place in the ecosystem and biomes. 

Biogeochemical cycles are the nutrient cycles. These are the cycles which are responsible for the recycling of the nutrients which are present in the geosphere and atmosphere. The nutrient recycling takes place in the ecosystem and biomes. The recycling of nutrients helps in maintaining the nutrients in the available form for the uptake by the organisms.

The abiotic components which are recycled without any involvement of the gaseous form are known as the sedimentary cycle. The element is present in the form of salts as rocks in the geosphere which is taken up by the plants and then transferred to the animals. The phosphate is generally transferred and used in the form of ATP by the living cells. 

Photosynthesis is the process in which autotrophs such as green plants use carbon dioxide and water in presence of sunlight to synthesize nutrients such carbohydrates in the form of glucose and release oxygen. Hence oxygen is returned to the atmosphere by photosynthesis. This oxygen from the atmosphere is taken in by animals for carrying out the process of respiration and carbon dioxide is evolved. This carbon dioxide is used by plants and the same cycle continues. Hence plants maintain the balance of oxygen and carbon dioxide in the atmosphere. Thus the correct answer is option C.

If a ecosystem such as an ecosystem is to be self-sustaining, materials such as oxygen, carbon dioxide, water and nitrogen must be able to recycle between the organisms. 

Biogeochemical cycle involves biological, geological and chemical factors. The circulation of chemical nutrients like carbon, oxygen, nitrogen, phosphorus, calcium, and water, etc. between biotic and abiotic components of the biosphere is known as a biogeochemical cycle.

The path through which a nutrient travels as it moves from the air, water or soil into the bodies of living organisms and back to the air, water or soil is called a biogeochemical cycle. It is one of the requirements to maintain the balance in nature.

The term biogeochemical cycle is used for exchange or circulation of biogenetic nutrients between living and nonliving components of a biosphere. 

Oxygen makes up approximately 21% of Earth's atmosphere by volume, making 20% the closest correct answer among the options. Nitrogen is the most abundant gas at about 78%.

Killing wild animals disrupts food chains and food webs, causing ecological imbalance. Predators control prey populations, and their removal can lead to overpopulation of certain species and collapse of ecosystem dynamics.

In sedimentary cycles of matter, materials involved in circulation between biotic and abiotic components of biosphere are non gaseous and the reservoir pool is lithosphere e.g., phosphorus, calcium, magnesium.
Sulphur has both sedimentary and gaseous phases.

Recycling of material is carried out by decomposers. If decomposers of an ecosystem vanish recycling of materials is stopped, thereby affecting the movement materials between the biotic and the abiotic systems that forms the biogeochemical cycle.

Sedimentary cycle consists of weathering of an existing rock followed by the erosion of minerals, transport and deposition. It has earth's crust as the reservoir pool. Sedimentary cycle having a small gaseous component is found in sulphur. Other sedimentary cycles include iron cycle, calcium cycle.

An ecosystem is made up of biotic and abiotic components. Biotic components include plants, animals, microorganism. Abiotic components include nonliving things such as water, air, temperature, materials of the soil. Essential material includes minerals like carbon, nitrogen, phosphorous. Cycling of materials include release of minerals back to the environment. 

There are various of abiotic reservoirs in which the nutrients are recycled, released and stored in atmosphere. Atmosphere is the reservoir of carbon and nitrogen. Hence, these cycles are also called atmospheric cycles. Water is the reservoir of hydrogen and oxygen. Hence, these cycles are called as hydrological cycles. Bedrock is the reservoir of phosphorous. Hence, it is also called as sedimentary cycle.

Biogeochemical cycles are also called as nutrient cycles. It includes gaseous cycles such as carbon cycle, oxygen cycle and sedimentary cycle. Sedimentary cycle consists of weathering of an existing rock followed by the erosion of minerals, transport and deposition. It has earth's crust as the reservoir pool. Examples of sedimentary cycle include sulphur cycle, phosphorous cycle, iron cycle, calcium cycle.

There are various nutrient cycles in an ecosystem which recycles the essential nutrients. The cycles are also called as biogeochemical cycles. Gaseous nutrient cycles include carbon cycle, oxygen cycle, nitrogen cycle. In these cycles, the element is released in the air. Sedimentary nutrient cycles include sulphur cycle, phosphorus cycle. In these cycles, the element is released in the sedimentary rocks.

A biogeochemical cycle is also called as nutrient cycle. It is of various types such as sedimentary cycle, gaseous cycle. Sedimentary cycle consists of weathering of an existing rock followed by the erosion of minerals, transport and deposition. It has earth's crust as the reservoir pool. The sulphur cycle is a sedimentary cycle without an atmospheric component. 

For the sedimentary type of biogeochemical cycles, the reservoir is earth's crust as the nutrients do not take any gaseous form rather they are either mineralized of immobilized but ultimately return to earth's crust by decomposition, leaching etc.

The inorganic nutrients cycle though more than the organisms, however, they also enter into the atmosphere, the oceans and even rocks. Since these chemicals cycle through both the biological and the geological world, we call the overall cycles biogeochemical cycles. 

Biogeochemical cycles are nutrient cycles. These are the cycles which are responsible for the recycling the nutrients which are present in the geosphere and atmosphere. The nutrient recycling takes place in the ecosystem and biomes. The recycling of nutrients helps in maintaining the nutrients in the available form for the uptake by the organisms.

The path through which a nutrient travels as it moves from the air, water or soil into the bodies of living organisms and back to the air, water or soil is called a biogeochemical cycle. It is required to maintain the nutrient level in the ecosystem.

Source of maximum sulfur is/reservoir of sulfur is rocks. It is found in the form of iron pyrites, evaporite rocks in the form of anhydrite and baryte and calcium and magnesium carbonates.