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Question

In countries closer to poles, plants are grown in glass or plastic built houses. What could be the possible reason?
  1. To protect them from grazing stock
  2. To provide hygienic atmosphere 
  3. To maintain optimum temperature 
  4. To cause global warming


Solution

The correct option is C To maintain optimum temperature 
As we moves towards the poles, there is a significant drop in temperature. In such areas which are subjected to extreme cold and heat conditions throughout the day, all kinds of crops can’t be grown well. To overcome this obstacle, closed indoor spaces made of glass or plastic houses, called green houses, are built. Heat from the sun is trapped in this house and optimum temperature (green house effect) and conditions for the growth of plants, germination of seeds, etc., are maintained with proper air ventilation even in adverse conditions.

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