Q31 / 200 · MHT CET - Medical 2026 (25 April Shift 2) · Biology

Which one among the following is NOT a reason for increase in concentration of carbon dioxide in the atmosphere?

  • A
    Burning of fossil fuel
  • B
    Rapid deforestation
  • Correct answer
    C
    Weathering of rocks
  • D
    Respiration by plants and animals

Solution

Burning of fossil fuels releases large amounts of carbon dioxide into the atmosphere.

Rapid deforestation reduces the number of trees available to absorb carbon dioxide through photosynthesis, leading to an increase in its atmospheric concentration.

Respiration by plants and animals is a natural process that releases carbon dioxide into the atmosphere.

Weathering of rocks, particularly silicate rocks, involves chemical reactions that consume atmospheric carbon dioxide and convert it into dissolved bicarbonates. Therefore, weathering of rocks acts as a sink for carbon dioxide and decreases its concentration in the atmosphere rather than increasing it.

Answer: Weathering of rocks

Hence, the correct answer is option: 'C'.

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