Question : Outline the salients features of carbon cycling in an ecosy

1.	Question : Outline the salients features of carbon cycling in an ecosystem .
Answer» Solution :All living organisms require nutrient ELEMENTS in relatively large amounts . They get the nutrients from the biosphere components . The nutrients elements derived from the earth by the living organisms for use in their growth and metabolism are called boigeochemicals or biogenetic nutrients . The movement of nutrient elements through the living and the nonliving components of the biosxphere is called biogeochemical CYCLE . In the gaseous CYCLES the reservoir for nutrient elements is in the atmosphere . The four most abundant elements in the living systems H, C,O, N - have predominantly gaseous cycles . The carbon cycle is quick and relatively perfect system in that the elements remain in circulation . Carbon is generally considered as the basis of life . Carbon atom is acting as a back bone for complex organic molecules like carbohydrates , lipids , proteins and nucleic acids . The main sources of carbon are air , water , fossil fuel and rocks . Carbon DIOXIDE is obtained from the biosphere by i. green plants for photosynthesis ii. corals for making calcareous skeletons . Carbon is added to the biosphere by i . respiration in organisms . ii. decay of organic wastes and dead organisms . iii. burning of fuel . iv. weathering of rocks v. volcanic activity .

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