GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygen
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Nitrogen
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Silicon
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Hydrogen
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Carbon
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Detailed explanation-1: -Complete Answer: The four most common elements are oxygen, carbon, hydrogen and nitrogen. Along with calcium and phosphorus, they make up 99% of the mass of living organisms. Sulphur is the element that is not one of the four most common elements.
Detailed explanation-2: -Silicon, magnesium, calcium, iron and cobalt are present in living tissue in trace amounts but are more abundant in earth’s crust. Q. Many elements are found in living organisms either free or in the form of compounds.
Detailed explanation-3: -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.
Detailed explanation-4: -Solution: Silicon is negligible in living matter.