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12.Ecosystem
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In carbon cycle, source of carbon to plants is
A
Atmospheric $CO_2$
B
Carbonate rocks
C
Fossil fuels
D
All of these
Solution
(a)Carbon present in the atmosphere and hydrosphere is available to the living world as free or dissolved $CO_2$. It is picked up by producers in the process of photosynthesis and changed to organic compounds.
Standard 12
Biology
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