Mushtaq Ahmed answered this
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Rosy answered this
Carbon cycle is a biogeochemical cycle (recycle mechanism) by which appropriate levels of carbon concentration is maintained in the environment.
The key processes involved in carbon cycle are photosynthesis and respiration.
In photosynthesis carbon-dioxide and water produce carbohydrate and oxygen. While respiration oxidize food to give carbon-dioxide and water.
In ocean and in rocks carbon-dioxide dissolves readily in water. In rock it get stored as calcium carbonate.
Carbon can either be liberated to atmosphere through respiration or can be passed to animal when being eaten or remain in plant even after death.
After death of plant or animal decomposition take place and carbon dioxide get released to atmosphere. They can also be buried inside the earth and converted to coal or natural gas . Natural gas and Coal are fuels and on combustion they release carbon dioxide back into the atmosphere.
- Carbon dioxide goes into the oceans and excess of carbon-dioxide can cause global warming.
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Padma Priya answered this
Carbon is present in the environment in many forms. Graphite and diamond are the elemental forms of carbon. In the atmosphere, carbon is present as carbon dioxide. Mineral forms of carbon include carbonates or hydrogen carbonates.
All organic substances are made up of carbon. Fats, vitamins, nucleic acids, carbohydrates, and proteins contain carbon as a structural component. Carbonate salts form endoskeletons and exoskeletons of many animals.
Carbon enters life forms through the process of photosynthesis. Photosynthesis is the process by which plants prepare food in the presence of sunlight and chlorophyll. During photosynthesis, carbon dioxide and water combine to produce glucose and oxygen.This changes the atmospheric carbon into glucose molecules.
Glucose, which is a source of food, is utilized by organisms to produce energy during respiration. During this process, glucose is broken down in the presence of oxygen to produce carbon dioxide.
Thus, through the processes of photosynthesis and respiration, carbon is utilized and then returned to the environment.
All organisms do not require oxygen to break down glucose and produce energy. The organisms which survive in the absence of oxygen are called anaerobes.
Another process that releases carbon dioxide is called combustion.It is the process of burning. Many substances release carbon dioxide on burning. Vehicular emissions, industrial fumes, and the gases released during the process of cooking are some instances during which carbon dioxide is released.
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