Which of these constituents of air is required by living things but cannot be taken directly from the atmosphere?
(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) all of these

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Solution

(b) nitrogen.

Living beings cannot take in nitrogen directly from the air as it is a relatively an unreactive gas.

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Which of these constituents of air is required by living things but cannot be taken directly from the atmosphere? (a) oxygen (b) nitrogen (c) carbon dioxide (d) all of these

(b) nitrogen.Living beings cannot take in nitrogen directly from the air as it is a relatively an unreactive gas.

Which of these constituents of air is required by living things but cannot be taken directly from the atmosphere?
(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) all of these

(b) nitrogen.

Living beings cannot take in nitrogen directly from the air as it is a relatively an unreactive gas.