Which of following contribute to carbon cycle

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12.Ecosystem

normal

Which of the following contribute to the carbon cycle

Photosynthesis

Respiration

Fossil fuel combustion

All above

Solution

(d)Carbon enters the biotic system through photosynthesis. In photosynthesis green plants utilize $CO_2$ and incorporate the carbon of $CO_2$ in Glucose. In respiration, burning of biomass and fossil fuels release a lot of $CO_2$. Burning of fossil fuels adds $6×$$10^{12}$ kg of carbon into atmosphere.

Standard 12

Biology