It is possible to determine whether an element is essential by observing growth of plants

Options

A. On soil from which the particular element is removed
B. On soil in which only the particular element is present
C. On an inert medium to which solution of only the particular element is added
D. On an inert medium to which a nutrient solution excluding that particular element, is added

Answer

D

Explanation

An element is said to be essential for plants if it has a specific structural or physiological role and without which plants cannot complete their life cycle. The requirement of the element must be specific and not replaceable by another element.