The form of nitrogen most usable to plants is
A)ammonia
B)nitrogen gas
C)proteins
D)nitrates
E)methane

Question

Quizplus · Accepted Answer

Plants absorb nitrogen in the form of nitrates (NO3-). Nitrogen gas (N2) is abundant in the atmosphere but cannot be used by most plants directly. Ammonia (NH3) can also be used by plants, but nitrates are the most common form of nitrogen in soil and are more readily available to plants. Proteins contain nitrogen, but they must be broken down by decomposers before the nitrogen becomes available to plants. Methane (CH4) does not contain nitrogen and is not a usable form of nitrogen for plants.

The Form of Nitrogen Most Usable to Plants Is