Other Free Encyclopedias » Science Encyclopedia » Science & Philosophy: Calcium Sulfate to Categorical imperative » Carbon Cycle - Cellular Respiration, The Burning Of Fossil Fuels, The Carbon Cycle In Land And Sea, Importance Of The Carbon Cycle - How carbon is released into the atmosphere, Volcanic eruption

Carbon Cycle - Cellular Respiration

dioxide photosynthesis atmosphere plants

Plants convert the carbon in atmospheric carbon dioxide into carbon-containing organic compounds, such as sugars, fats, and proteins. Plants take in carbon dioxide through microscopic openings in their leaves, called stomata. They combine atmospheric carbon with water and manufacture organic compounds, using energy trapped from sunlight in a process called photosynthesis. The by-product of photosynthesis is oxygen, which plants release into the atmosphere through the stomata.

Animals that eat plants, or that eat other animals, incorporate the carbon in the sugars, fats, and proteins derived from the ingested biomass into their bodies. Inside their cells, energy is extracted from the food in a process called cellular respiration. Cellular respiration requires oxygen (which is the by-product of photosynthesis) and it produces carbon dioxide, which is used in photosynthesis. In this way, photosynthesis and cellular respiration are linked in the carbon cycle.

Photosynthesis requires atmospheric carbon, while cellular respiration returns carbon to the atmosphere, and vice versa for oxygen. The global rates of photosynthesis and cellular respiration influence the amount of carbon dioxide in the atmosphere. In the summer, the high rate of photosynthesis uses up much of the carbon dioxide in the atmosphere, and the amount of atmospheric carbon dioxide decreases. In the winter, when the rate of photosynthesis is low, the amount of atmospheric carbon dioxide increases.

Another way that cellular respiration releases carbon into the atmosphere is through the actions of decomposers. Decomposers, such as bacteria and fungi, derive their nutrients by feeding on the remains of plants and animals. The bacteria and fungi use cellular respiration to extract the energy contained in the chemical bonds of the decomposing organic matter, and so release carbon dioxide into the atmosphere.

In some ecosystems, such as tropical rainforests, decomposition is accomplished quickly, and carbon dioxide is returned to the atmosphere at a relatively fast rate. In other ecosystems, such as northern forests and tundra, decomposition proceeds more slowly. In some places, such as bogs and the deep ocean, the organic matter of plants and animals may accumulate in deep sediments, where decomposers cannot function well because of the lack of oxygen. Slowly, over millions of years, the carbon-rich materials are converted into carbon-rich fossil fuels, such as petroleum, natural gas, and coal. Also in marine environments, carbon-containing matter (such as calcium carbonate) is incorporated into the shells and other hard parts of aquatic organisms. When these organisms die, the carbon-rich hard parts sink to the ocean bed. There they become buried in sediment, and eventually densify into rocks such as limestone and dolomite.


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almost 2 years ago

I agree with Zoey. This isn't what it should be.

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about 4 years ago

This didn't really answer my question of: what are the roles of photosynthesis, and cellular respiration in the carbon cycle.

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over 1 year ago

I agree with Zoey and Cameron. This doen't really explain what we are asking, or what you are telling us you are going to explain.

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over 1 year ago

Yea I agree with them niggas zoey Cameron and rose this doesn't answer stuff my nigga u needs to correct yo stuff and stop putting fake booty stuff on the World Wide Web ya hear 

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about 1 year ago

Pretty sure that the role of photosynthesis is to remove carbon from the atmosphere and then use it to create glucose which is then used for plants to eat and then the byproduct of oxygen is released into the atmosphere which is then used in the process of cellular Respiration, so i believe that the role of photosynthesis is to remove carbon from the atmosphere while cellular respiration role is to add carbon into the atmosphere, i very much could be wrong and yes the dude who wrote this article needs to answer the goddamn question instead of adding random info that is only slightly important, peace out MEOW