Which of the following statements is/are incorrect with respect to hydroponics?
(I) Hydroponics involves the culture of plants in a soil-free mineral nutrient solution.
(II) Hydroponics requires purified water with non-defined mineral nutrient salts.
(III) In hydroponics technique, plants are grown in sandy soil with nutrient solution.
(IV) By this method, essential elements required for the growth of plants can be identified and their deficiency
symptoms can also be discovered.
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