Question

What are the biogeochemical cycles? Describe various types of biogeochemical cycles in
the ecosystems

Answer 1

A "biogeochemical cycle" is a pathway wherein a chemical substance moves through "biotic (biosphere)" & "abiotic (atmosphere, hydrosphere, & lithosphere) "compartments of the Earth".

Explanation:

The major biogeochemical cycles in the ecosystems are

(i) Water Cycle/Hydrologic Cycle

Water evaporates into the atmosphere during this cycle from transpiring oceans  lakes, plants, rivers & lakes. Subsequently these water vapors cool off and condense to form water and clouds. As snow and rain, water then returns to the Earth.

(ii) Carbon Cycle

The bulk of carbon dioxide is photosynthesized in the living world. The synthesized organic compounds are passed on to the consumer (herbivores and carnivores), from the producers (green plants). Animals and plants emit carbon as carbon dioxide in their emissions out into the surrounding environment. The dead bodies of animals and plants and the body wastes that build up carbon compounds,  are decomposed by microorganisms to discharge carbon dioxide. Carbon is also recycled when  burning fossil fuels.

(iii) Nitrogen Cycle

Atmospheric nitrogen is elementary and cannot be used by living organisms as such. In order to be used by green plants it must be "fixed" along with other elements like carbon, oxygen, or hydrogen. Nitrogen  continually enters into the air by the action of "denitrifying bacteria" and returns to the cycle via the action of  electrification & lightening.

(iv) Oxygen Cycle

The body is directly supplied with oxygen used to breathe in plants and animals from the surrounding medium such as water & air. In the "form" of water & carbon dioxide, oxygen returns to the "surroundings". This also enters into the plant, during photosynthesis, as carbon dioxide & water and, as a by-product, is released into the same process in the form of molecular oxygen for use in respiration. The cycle is thus finished.

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Choose the best description for each cycle. 1. nitrogen a ...

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Answer 2

When biotic and abiotic factors such as water, move in a system between living and nonliving components it is known as biogeochemical cycles.

Explanation:

• There are three types of biogeochemical cycles in an ecosystem.
• Carbon cycle: The process by which components of carbon are exchanged between the environment is called the carbon cycle. For example photosynthesis and combustion of fossil fuels.
• Nitrogen cycle: The process by which nitrogen is exchanged between living and non-living components. For example, nitrogen fixation.
• Water cycle: The process by which water evaporates and then condenses is called the water cycle. For example rain