The deficiency of an essential element can be fulfilled by-
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a
Providing another essential element in excess
b
Providing a combination of any 3 essential elements
c
Leaving plant to grow directly under the sun for at least a week
d
Providing the same essential element in required amounts
answer is D.
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Detailed Solution
The requirement of an essential element is specific and is not replaceable by another element. In other words, the deficiency of any one element cannot be met by supplying some other element.