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      Question

      "Fan and Pad" system in a greenhouse is used for:

      A Heating Correct Answer Incorrect Answer
      B Evaporative cooling Correct Answer Incorrect Answer
      C CO2 enrichment Correct Answer Incorrect Answer
      D Dehumidification Correct Answer Incorrect Answer

      Solution

      Fans pull air through wet cellulose pads; as water evaporates, it absorbs heat from the air. This can lower the greenhouse temperature by 10-12°C below ambient levels.

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