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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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4 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.
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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