In hydroponics, plants are grown

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in a solution containing soil, minerals and water in a defined proportion

in a solution containing plant ash and water

by providing nutrients laden moist air to the roots of the plant.

in a solution containing essential nutrients in a definite proportions.

answer is D.

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Detailed Solution

Julius von Sachs 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.

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