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An Intiative by Sri Chaitanya
a
in a solution containing soil, minerals and water in a defined proportion
b
in a solution containing plant ash and water
c
by providing nutrients laden moist air to the roots of the plant.
d
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.