'All elements that are present in a plant need not be essential to its survival.' Comment.

(N/A) Plants absorb a wide variety of elements from the soil through their root systems. However,an element is considered 'essential' only if it is directly involved in the plant's metabolism,growth,and reproduction.
Many elements are absorbed by plants simply because they are present in the soil solution,even if they serve no biological function. For example,plants growing near radioactive sites often accumulate radioactive isotopes,and plants near mining areas may accumulate heavy metals like gold or selenium.
These elements are present in the plant tissues,but they are not required for the plant's life cycle. Therefore,the presence of an element in a plant does not automatically imply that it is essential for its survival.