Environment & Ecology question from JKAS Prelims, 2022 by JKPSC
Which among the following bacteria play a role in the process of denitrification?
Last updated Jun 24, 2026
Correct Answer:
Option C —
Pseudomonas
Understanding Denitrification Denitrification is a microbially facilitated process where nitrates ($NO_3^-$) are reduced and ultimately converted into gaseous nitrogen ($N_2$). This process completes the nitrogen cycle by returning nitrogen to the atmosphere. Pseudomonas and Thiobacillus are the primary genera of bacteria responsible for this process.These are generally facultative anaerobes, meaning they perform denitrification in anaerobic conditions (low oxygen), such as waterlogged soils.
Key Points for Ecology & AgricultureSoil Fertility: Denitrification is generally considered detrimental to agriculture because it removes nitrogen (a vital nutrient) from the soil and releases it into the air.Environmental Impact: If the process is incomplete, it can release Nitrous Oxide ($N_2O$), which is a potent greenhouse gas.Nitrification vs. Denitrification: While Nitrification is an aerobic process (requires oxygen), Denitrification is an anaerobic process.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
