Multiple choice

What's true about atmospheric nitrogen?

  1. It has the formula N3.

  2. It is useful for plants as they grow.

  3. It is the second most abundant atmospheric gas after oxygen.

  4. It has to be fixed by bacteria in order to be useful.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Atmospheric nitrogen (N2) is inert and cannot be used directly by plants. It must be 'fixed' by bacteria into forms like ammonia or nitrates to be biologically useful.

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