Carbon is the basic constituent of all living beings. Its organic compounds play a major role in our life as carbohydrates, fats, proteins and nucleic acids. Food, fibres (cotton, jute), medicines, fertilizers, fuels—all contain compounds of carbon. There are three main reservoirs of carbon:
(a) Atmosphere,
(b) Oceans, and
(c) Carbonate rock, coal and petroleum.
The atmosphere, in which carbon is present as carbon dioxide, serves as the main reservoir of carbon. Some carbon dioxide is also found dissolved in water. Carbon dioxide constitutes 0.03 per cent of the atmosphere. Most of the carbon dioxide enters the living world through the process of photosynthesis. The amount of carbon fixed by photosynthesis per year is to kg. The process of photosynthesis takes place on land as well as in water. Carbon dioxide enters the producers by diffusion and is then utilized for photosynthesis.
Carbon cycle ensures a constant __________________ | |||
Right Option : A | |||
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In atmosphere, carbon is present as _______________________. | |||
Right Option : C | |||
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In which one of the following processes carbon dioxide is not released ? | |||
Right Option : C | |||
View Explanation |
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