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Free "Carbon Dioxide and Carbon Cycle MCQ" App Download [Free] with MCQ: What are two main processes which occur in natural carbon cycle?; with answers: photosynthesis and decomposition, photosynthesis and respiration, photosynthesis and combustion, and photosynthesis and metabolism for environmental sustainability education. Practice Carbon Dioxide and Carbon Cycle Quiz Questions, download Apple Book (Free Chapter) to improve academic systems.

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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