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All elements that are present in plant need not be essential to its survival. Comment.
Answer
All elements present in the plant need not be essential to its survival. For a element to be essential it has to meet all the criteria for essentiality. The criteria for essentiality are :

i. The element must be absolutely esential for supporting the normal growth and reproduction. The plant should be unable to complete its lifecycle in the absene of the element.

ii. The element requirement should be specific and not replaceble by another element. 

iii. The element must be directly involved in the metabolism of the plant. 

Since, all the elements do not meet all the criteria, they are not considered to be essential to the plant.