Question Detail
Question
The chart below is a simple representation of the nitrogen cycle. T humus N2 animals S V Plants NO3 U NH3. To which processes do the letters S, T, U and V refer?
Correct Answer
Option C is the correct answer.
Detailed Explanation
From the diagram: S is the process from atmospheric N2 going to plants/NO3? The diagram is a bit unclear, but standard cycles show: S: N2 -> Plants (likely through bacteria in soil/roots) is Nitrogen Fixation. T: Humus -> N2 (releasing N2 back to atmosphere) is Denitrification. U: NH3 (ammonia) -> NO3 (nitrate) is Nitrification. V: NO3 -> Plants (uptake) is not a specific process like the others, but in the context, it might be Nitrogen Fixation? Option C lists S: nitrogen fixation, T: denitrification, U: nitrification, V: nitrogen fixation. This is the most common set of processes in a simple N-cycle diagram.
Hint
Match the transformations: N2 to ammonia/plants (fixation), NH3 to NO3 (nitrification), NO3 back to N2 (denitrification).