NEET BIOLOGY

Detailed explanation-1: -Many elements are found in living organisms either free or in form of compounds. One of the followings is negligible is living organisms.

Detailed explanation-2: -They are carbon, oxygen, hydrogen, nitrogen, and sulfur. They are present in the abundant quantity of living organisms.

Detailed explanation-3: -Solution : Silicon is not found freely in nature, but it does occur as oxidse and silicates, whereas magnesium, iron and sodium are present in living organisms as ions. Silicon is essential to plant life but is often found in minute quantities in human body and its function is still unknown.

Detailed explanation-4: -In all living systems we can always find 4 basic elements: carbon, oxygen, nitrogen and hydrogen. Carbon is the basic building unit contained in living matter. The percentage of carbon in the mass of living matter is 19.4 %. Oxygen and hydrogen are present in almost all organic compounds which create living organisms.

Detailed explanation-5: -Detailed Solution. Zinc is not an element common to all living organisms. The six elements common to all living organisms are: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus and Sulfur.