Carbon Cycle


 
 
Concept Explanation
 

Carbon Cycle

Carbon Cycle: 

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 4times10^1^3 to 9times10^1^3 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.

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Sample Questions
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Question : 1

Carbon cycle ensures a constant __________________

Right Option : A
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Question : 2

Organic compounds play a major role in our life as ______________________.

Right Option : D
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Question : 3

Which of the following are correct :

(a) Carbon dioxide returns to the atmosphere through respiration in plants and animals.

(b) Carbon dioxide enters the producers by diffusion and is then utilized for photosynthesis.

(c) The process of photosynthesis takes place on land as well as in water.

Right Option : D
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