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Hydroponics I. is useful in areas having infertile and dry soils II. Can regulate pH optimum for a particular crop. III. Increases labour cost. IV. In

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Hydroponics
I. is useful in areas having infertile and dry soils
II. Can regulate pH optimum for a particular crop.
III. Increases labour cost.
IV. Increases problem of weeding.
A. II and IV
B. I and II
C. I and III
D. All of the above
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Correct Answer - B
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