Hydroponics is a method in which essential and non essential nutrients can be find out in this type\tthe conservation of water resources\tplant development in water soil\tplant development in xerophytic condition\tplant development in water without soil

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Correct Answer is 4. Plant development in water without soil
In 180, Julium Von Sachs, a German botanist demonstrated for the first time that plants could be grown to maturity in a defined nutrient solution in complete absence of soil
This technique of growing plants in a nutrient solution is known as hydroponics.