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      Question

      Which gas is often supplemented in greenhouses to

      increase photosynthesis?
      A Oxygen Correct Answer Incorrect Answer
      B Nitrogen Correct Answer Incorrect Answer
      C Carbon Dioxide Correct Answer Incorrect Answer
      D Methane Correct Answer Incorrect Answer

      Solution

      Raising CO2 levels to 800–1000 ppm can significantly increase the growth rate and yield of greenhouse crops. It compensates for the CO2 depletion that occurs during active daylight hours.

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