The form of nitrogen that comprises 78% of atmospheric mass and is necessary for biological processes, but unusable by plants is A)N₂. B)NO_x. C)N₂O. D)NO₂.

Question

Quizplus · Accepted Answer

N₂ (dinitrogen) makes up 78% of the Earth's atmosphere. It is essential for biological processes but is not directly usable by most plants, which require nitrogen in a fixed form like ammonia or nitrate.

The Form of Nitrogen That Comprises 78% of Atmospheric Mass