Question

Many elements are found in living organisms either free or in the form of compounds. Which one of the following is not found in the living organisms?
a)Silicon
b)Magnesium
c)Iron
d)Sodium

Answer 1

Hint: The living organism is composed of the elements which are essential for their existence. They are the building blocks of life. They are present from the smallest unit to the biggest unit in the cell. They help in the transportation of the signals.

Complete answer: There are so many elements present and found on the earth. The main component which is present in the living organism is carbon, hydrogen, and oxygen. They are basic elements present in the most primitive to the most complex living organism present on the earth. There are some elements that are known as the building blocks of the living organism. They are carbon, oxygen, hydrogen, nitrogen, and sulfur. They are present in the abundant quantity of living organisms. They mainly constitute our organs and muscles. There are other components that we take from our diet and are required by the body for proper functioning. They are sodium, calcium, magnesium, potassium, chlorine, and phosphorus. They are required in less quantity as compared to the bulk elements required by the body so they are known as the macromolecules. They help in providing the essential ions in the body fluids and form the structural components of the body. There are also trace elements that are required and present in the body. They are rubidium and strontium. They are present in very small quantities that they may remain undetected by blood tests performed.

So, the answer is ‘silicon’.

Note: Silicon is an element that is used in the semiconductors. It is also used in the various industries. It is known for its good electrical properties. Silicon is extracted from the metallurgical grade gravel.