Question

Nitrogen is returned back into the atmosphere by the activity of _________

(a) Decomposers

(b) Dead organisms

(c) Nitrifying bacteria

(d) Pathogenic bacteria

I had been asked this question in an online quiz.

The above asked question is from Wastewater Treatment Systems in section Bacterial Metabolism in Wastewater Treatment Systems of Environmental Biotechnology

Answer 1

Right choice is (a) Decomposers

Easy explanation: Decomposers break down the complex nitrogen compounds present in dead organisms and returns it back into the atmosphere, Dead organisms are degraded, Nitrifying bacteria converts ammonia, Pathogenic bacteria infects organisms.