Multiple choice

The carbon used by green plants in photosynthesis is derived from ________.

  1. H2O

  2. CO2

  3. C6H12O6

  4. Ferredoxins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide, either in the atmosphere or in solution in surface waters, is the major source of carbon for living organisms. It is converted to organic form, by the autotrophs, which use it as sole carbon source. The most important in this conversion, are the photosynthetic autotrophs (seed plants on land and algae in water) that carry out oxygen producing type of photosynthesis.

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