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Carbon Cycle MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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6 Questions around this concept.
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The cycling of carbon between biotic and abiotic systems is called
Assertion: Human activities such as burning fossil fuels and deforestation have led to an increase in atmospheric carbon dioxide levels.
Reason: These activities release carbon that was previously stored in the earth's crust, leading to an imbalance in the carbon cycle.
Among the following biogeochemical cycles which one does not have losses due to respiration?
Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm
Concepts Covered - 0
Carbon Cycle
- The carbon constitutes 49 percent of dry weight of organisms and is next only to water.
- Going by the total quantity of global carbon, we find that 71 percent carbon is found dissolved in oceans.
- This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
- Fossil fuel also represents a reservoir of carbon.
- Carbon cycling occurs through the atmosphere, ocean and through living and dead organisms.
- According to one estimate 4 × 1013 kg of carbon is fixed in the biosphere through photosynthesis annually.
- A considerable amount of carbon returns to the atmosphere as CO2 through respiratory activities of the producers and consumers.
- Decomposers also contribute substantially to CO2 pool by their processing of waste materials and dead organic matter of land or oceans.
- Some amount of the fixed carbon is lost to sediments and removed from circulation.
- Burning of wood, forest fire and combustion of organic matter, fossil fuel, volcanic activity are additional sources for releasing CO2 in the atmosphere.
- Human activities have significantly influenced the carbon cycle.
- Rapid deforestation and massive burning of fossil fuel for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere.
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