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Carbon Dioxide and Carbon Cycle MCQs PDF Download – Prep Test

MCQ 1: What are two main processes which occur in natural carbon cycle?

  1. Photosynthesis and decomposition
  2. Photosynthesis and respiration
  3. Photosynthesis and combustion
  4. Photosynthesis and metabolism

MCQ 2: The concentration of Carbon dioxide has increased; from:

  1. 300 ppm to 370 ppm
  2. 280 ppm to 370 ppm
  3. 200 ppm to 370 ppm
  4. 380 ppm to 370 ppm

MCQ 3: Which isotope of carbon is very rare and radioactive?

  1. Carbon-12
  2. Carbon-13
  3. Carbon-14
  4. Carbon-11

MCQ 4: Planktons live on the surface of::

  1. Pond
  2. River
  3. Ocean
  4. Lake

MCQ 5: The size of 'plankton' is::

  1. four-thousandth of a millimetre
  2. three-thousandth of a millimetre
  3. one-thousandth of a millimetre
  4. Two-thousandth of a millimetre

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