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Carbon Dioxide and Carbon Cycle MCQ Quiz Online

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MCQs on Carbon Dioxide and Carbon Cycle Quiz

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

Photosynthesis and decomposition
Photosynthesis and respiration
Photosynthesis and combustion
Photosynthesis and metabolism

MCQ: The concentration of Carbon dioxide has increased; from

300 ppm to 370 ppm
280 ppm to 370 ppm
200 ppm to 370 ppm
380 ppm to 370 ppm

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

Carbon-12
Carbon-13
Carbon-14
Carbon-11

MCQ: Planktons live on the surface of:

Pond
River
Ocean
Lake

MCQ: The size of 'plankton' is:

four-thousandth of a millimetre
three-thousandth of a millimetre
one-thousandth of a millimetre
Two-thousandth of a millimetre