Nitrogen can be used by plants as a nutrient when it is in the form(s) of ____.
A) a gas
B) ammonia only
C) large proteins
D) ammonia, ammonium ion, or nitrate ion
E) organic molecules

Question

Quizplus · Accepted Answer

Nitrogen must be in the form of either ammonia, ammonium ion, or nitrate ion for plants to utilize it as a nutrient. Nitrogen gas (N2) cannot be directly utilized by plants in this way, and organic molecules are broken down by various processes before nitrogen can be extracted and utilized. Large proteins also require breakdown before the nitrogen can be utilized.

Nitrogen Can Be Used by Plants as a Nutrient When