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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 800โ€“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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