A trace element is/are

A trace element is an element which

Which trace element is absorbed as monovalent anion ?

Which trace element is absorbed as monovalent anion ?

This trace element is needed for insulin to exert its maximal effect in glucose uptake:

This trace element is needed for insulin to exert its maximal effect in glucose uptake

A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as

A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as

A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as

A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as

Which of these is not a trace element in plants?