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The burning issue in the world as of now is global warming. Global warming has been a major threat to agriculture and food security. One of the threats caused by global warming is drought, which is responsible for reduced yield of crops and in some cases severely damage the crops to the point of no production and so it poses a big threat towards food security. By knowing in which system drought affects a plant can be used to develop resistant varieties accordingly. Knowing the effects of drought provides a parameter to judge a plant’s level of resistance towards drought. New drought tolerant varieties can be produced by making crosses between varieties which are less affected by drought and selecting among their progeny.