Which of the following statements is the right description of a Greenhouse?

Options :
  1. It is a building chiefly of glass in which the temperature is very low
  2. It is a building in which green plants are cultivated
  3. It is a building chiefly of glass in which the temperature is maintained within the desired range
  4. None of these
Answer and Explanation :-

Answer: Option 3


A greenhouse (also called a glasshouse) is a building or complex in which plants are grown. These structures range in size from small sheds to industrial-sized buildings. A miniature greenhouse is known as a cold frame. Commercial glass greenhouses are often high tech production facilities for vegetables or flowers. The glass greenhouses are filled with equipment like screening installations, heating, cooling, lighting and also may be automatically controlled by a computer to maximize potential growth. A greenhouse is a structural building with different types of covering materials, such as a glass or plastic roof and frequently glass or plastic walls; it heats up because incoming visible sunshine is absorbed inside the structure. Air warmed by the heat from warmed interior surfaces is retained in the building by the roof and wall; the air that is warmed near the ground is prevented from rising indefinitely and flowing away. The most important environmental parameters that need to be controlled for optimal greenhouse climate are temperature, relative humidity and carbon dioxide (CO2). Temperature is the most important single parameter in greenhouse controls as temperature has a significant role in plant growth and development. The optimal temperature depends on the plant species grown and desired level of photosynthetic activity. Typical greenhouse temperatures vary between 10-20°C (50-68°F). Too high temperature reduces plant growth, eventually resulting in plant wilting and death whereas too low temperature limits plant growth. In addition to optimizing the greenhouse temperature, humidity control is of vital importance as optimal plant growth can only be achieved within a certain humidity range. Too high relative humidity encourages mould growth, which causes plant diseases and can also damage the greenhouse structures. Too dry environment slows down the plant growth. The optimal relative humidity depends on the plant species grown, with a typical range varying b

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