Question

Assertion: For biological functions in the human body, barium is not required.
Reason: Barium is a divalent ion.
A. Both assertion and reason are correct and reason is the correct explanation of assertion
B. Both assertion and reason are correct and reason is not the correct explanation of assertion
C. Assertion is correct but reason is not correct
D. Both assertion and reason are incorrect

Answer 1

Body functions are the physiological or psychological functions of body systems. The body's functions are ultimately its cells' functions. Survival is the body's most important business. Survival depends on the body's maintaining or restoring homeostasis, a state of relative constancy, of its internal environment.

Complete step by step answer:
For biological functions of the human body, we need monovalent $Na$ and $K$ ions and divalent $Mg,Zn$ and $Ca$ ions, which are found in large proportions in biological fluids. Hence barium is not required for the biological functioning of the human body. Hence the assertion is correct
Barium is a chemical element with the symbol Ba and atomic number $56$. It is the fifth element in group two and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. Barium cation is a divalent ion with $+2$ charge. Hence, the reason is also correct.

Both assertion and reason are correct and reason is not the correct explanation of assertion. Hence, the correct answer is B.

Note: Natural development of chemicals and elements challenged organisms to adapt or die. Current organisms require redox reactions to induce metabolism and other life processes. Metals have a tendency to lose electrons and are important for redox reactions.