Question:
The process of converting atmospheric nitrogen into a form usable by plants is called:
The process of converting atmospheric nitrogen into a form usable by plants is called:
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Nitrogen fixation = Making atmospheric N usable for plants.
Updated On: Jul 2, 2026
- Nitrification
- Denitrification
- Nitrogen fixation
- Ammonification
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The Correct Option is C
Approach Solution - 1
Nitrogen fixation is the process where atmospheric nitrogen (N$_2$) is converted into ammonia (NH$_3$) by certain bacteria, making nitrogen available to plants. This can be biological (e.g., Rhizobium in legumes) or industrial (Haber-Bosch process).
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Approach Solution -2
Break Down the Terms: 'Fixation' means converting a gas into a usable, stable form — narrow down which nitrogen process matches that description.
Nitrogen fixation converts atmospheric N$_2$ gas into ammonia (NH$_3$), a form plants can actually use — done biologically (Rhizobium) or industrially (Haber-Bosch).
Nitrification and denitrification both act on nitrogen AFTER it's already fixed, and ammonification just releases ammonia from organic matter — none of these describes converting atmospheric N$_2$ into a usable form.
Nitrogen fixation converts atmospheric N$_2$ gas into ammonia (NH$_3$), a form plants can actually use — done biologically (Rhizobium) or industrially (Haber-Bosch).
Nitrification and denitrification both act on nitrogen AFTER it's already fixed, and ammonification just releases ammonia from organic matter — none of these describes converting atmospheric N$_2$ into a usable form.
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