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Our atmosphere contains about what share of nitrogen gas?

A21 per cent
B50 per cent
C95 per cent
D78 per cent
Answer & Solution
Correct answer: D. 78 per cent
1. Plants cannot take it directly. 2. Nitrogen is 78 per cent of air. 3. Bacteria fix it into compounds. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._
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