Which form of nitrogen is most usable to plants?
A) ammonia
B) nitrogen gas
C) proteins
D) nitrates

Question

Which form of nitrogen is most usable to plants? 
A) ammonia 
B) nitrogen gas 
C) proteins 
D) nitrates

Quizplus · Accepted Answer

Nitrates are the most usable form of nitrogen for plants because they can be directly absorbed by plant roots and used for various biological processes including photosynthesis, metabolism, and growth. Ammonia and proteins also contain nitrogen but they need to be converted into nitrates through nitrification before they can be taken up by plants. Nitrogen gas is relatively inert and needs to be fixed into a usable form such as ammonia or nitrates before plant uptake.

Which Form of Nitrogen Is Most Usable to Plants