Many elements are found in living organisms either free or in the form of compounds. Which one of the following is not found in living organisms?

Silicon

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Magnesium

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Iron

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Sodium

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Solution

The correct option is C Silicon
A comparison of elements present in non-living and living matter is given in the table below:
Elements $%$ weight of $%$ weight of
Earth crust (non living matter) Human body (living matter)
Hydrogen 0.14 0.5
Carbon 0.03 18.5
Oxygen 46.6 65.0
Nitrogen very little 3.3
Sulphur 0.3 0.3
Sodium 2.8 0.2
Calcium 3.6 1.5
Magnesium 2.1 0.1
Silicon 27.7 negligible

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Similar questions

Many elements are found in living organisms either free or in the form of compounds. One of the following is not found in living organisms.

(a) Silicon (b) Magnesium

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Elements	$%$ weight of	$%$ weight of
	Earth crust (non living matter)	Human body (living matter)
Hydrogen	0.14	0.5
Carbon	0.03	18.5
Oxygen	46.6	65.0
Nitrogen	very little	3.3
Sulphur	0.3	0.3
Sodium	2.8	0.2
Calcium	3.6	1.5
Magnesium	2.1	0.1
Silicon	27.7	negligible