Carbon and Nitrogen Cycles Quiz
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Questions and Answers

What is the main way in which inorganic carbon (CO2) in the atmosphere is converted to organic Carbon?

  • Photosynthesis (correct)
  • Cellular Respiration
  • Nitrogen Fixation
  • Phosphorous Cycle

How do living organisms convert organic carbon to CO2, releasing it back into the atmosphere?

  • Cellular Respiration (correct)
  • Photosynthesis
  • Carbon Fixation
  • Nitrogen Fixation

What is a major source of CO2 production and release into the atmosphere by humans?

  • Phosphorous Cycle
  • Photosynthesis
  • Burning of fossil fuels (correct)
  • Nitrogen Fixation

Which process allows plants to utilize nitrogen, which they cannot directly extract from the atmosphere?

<p>Nitrogen Fixation (B)</p> Signup and view all the answers

What was the role of stromatolites in the early Earth's atmosphere?

<p>Producing oxygen through photosynthesis (B)</p> Signup and view all the answers

What event allowed life to move onto land according to the text?

<p>Formation of the ozone layer (B)</p> Signup and view all the answers

When did the complexity of life on Earth increase significantly?

<p>Cambrian Explosion, about 500 million years ago (B)</p> Signup and view all the answers

How did plate tectonics contribute to the Earth's changes?

<p>Subducting oceanic plate under lighter oceanic plate (A)</p> Signup and view all the answers

What event led to the dominance of mammals on Earth?

<p>65 million years ago meteor impact (D)</p> Signup and view all the answers

What caused the extinction about 250 million years ago according to the text?

<p>Supercontinent Pangea splitting apart (D)</p> Signup and view all the answers

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