Source of carbon to plants is

A. Carbon dioxide of carbonate rocks

B. Fossil fuels

C. Atmospheric carbon dioxide

D. All of the above

Answer: Option C

Solution(By Examveda Team)

Source of carbon to plants is Atmospheric carbon dioxide.
Nearly half the dry substance of plants is carbon; and it is conclusively established that they derive, at any rate, the greater part of it, directly from the carbon-dioxide of the atmosphere, which the chlorophyll cells have the power of decomposing in sunlight, at the same time evolving oxygen.