Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2 ) to the atmosphere?
Correct answer: D. Anaerobic ammonium oxidation and denitrification.
- A. Aerobic nitrate oxidation and nitrite reduction
- B. Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
- C. Enteric fermentation in cattle and nitrogen fixation by Rhizobium in the root nodules of legumes
- D. Anaerobic ammonium oxidation and denitrification.
Explanation
Denitrification is a chemical process in which nitrates in the soil are reduced to molecular nitrogen (N2 ) which is released into the atmosphere. It is done by denitrifying bacteria like Pseudomonas denitrificans. Anaerobic oxidation of ammonium (NH4 ) also releases nitrogen into the atmosphere.
Last updated
About Man and His Environment
Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
Practise Man and His Environment
382 free Man and His Environment MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
Conversion of ammonium into nitrates is:
In a forest, there are a lot of plants; trees, shrubs, and herbs. What will the Palm trees face if they grow in the same forest?
The animals that feed on organic debris from decomposing plants and animals are called:
Process ensuring the survival of species over long periods of time, even though individual members of the species die.
The position of an organism in a food chain of an ecosystem called: