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Free download in PDF Nitrogen Fixation Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams of Biochemistry, Agriculture, Biotechnology, Botany etc. These short solved questions or quizzes are provided by Gkseries.
(1)
Which of the following N2 fixer is involved in symbiotic association with legumes forming root nodules?
[A]
Azotobacter
[B]
Rhodospirillum
[C]
Clostridium
[D]
Rhizobium
(2)
Splitting of dinitrogen molecule into free nitrogen atom in biological N2 fixation is carried out by
[A]
Hydrogenase
[B]
Dinitrogenase
[C]
Nitrate Reductase
[D]
Nitrogenase
(3)
Industrial fixation is accomplished by
[A]
Haber process
[B]
Helmonts process
[C]
Friedel- Crafts reaction
[D]
None of these
(4)
Leghaemoglobin creates
[A]
Suitable environment for nodule formation
[B]
Required oxygen concentration for optimum activity of nitrogenase
[C]
Aerobic condition for optimum activity of nitrogenase
[D]
Anaerobic condition for optimum activity of nitrogenase
Answer: Anaerobic condition for optimum activity of nitrogenase
(5)
The reaction of glutamate and NH4+ to yield glutamine is catalyzed by
[A]
Glutamine synthase
[B]
Glutamate synthase
[C]
Adenylyltransferase
[D]
Uridylyltransferase
Answer: Glutamine synthase
(6)
Which of the following catalyzes reactions that incorporate nitrogen derived from glutamine?
[A]
Glutamine amidotransferase
[B]
Glutamine synthase
[C]
Glutamate synthase
[D]
Adenylyltransferase
Answer: Glutamine amidotransferase
(7)
Formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds is called as
[A]
Nitrogen assimilation
[B]
Nitrogen fixation
[C]
Nitrification
[D]
Denitrification
Answer: Nitrogen assimilation
(8)
Ammonia or ammonium is oxidized to nitrite followed by the oxidation of nitrite to nitrate is called as
[A]
Nitrogen fixation
[B]
Nitrification
[C]
Denitrification
[D]
Nitrogen assimilation
(9)
Nitrate is reduced and ultimately produces N2 through a series of intermediate gaseous nitrogen oxide products is called as
[A]
Nitrogen fixation
[B]
Nitrification
[C]
Nitrogen assimilation
[D]
Denitrification
(10)
The conversion of nitrogen to ammonia or nitrogenous compounds is called as
[A]
Nitrogen fixation
[B]
Nitrogen assimilation
[C]
Denitrification
[D]
Nitrification
Answer: Nitrogen fixation
(11)
Plants cannot absorb molecular N2 in the atmosphere because
[A]
N2 has triple bonds making it highly stable
[B]
N2 has double bonds making it highly stable
[C]
Abundance in the atmosphere inhibits absorption
[D]
None of these
Answer: N2 has triple bonds making it highly stable
(12)
Anabaena, a N2 fixer is present in the root pockets of
[A]
Marselia
[B]
Salvinia
[C]
Pistia
[D]
Azolla
(13)
The conversion of amino acids to ammonium by soil decomposers is called
[A]
Ammonification
[B]
Mineralization
[C]
Deamination
[D]
Both A And B
(14)
To fix one molecule of nitrogen
[A]
6 ATP molecules are required
[B]
12 ATP molecules are required
[C]
20 ATP molecules are required
[D]
16ATP molecules are required
Answer: 16ATP molecules are required
(15)
Conversion of NO2- to NO3- is carried out by
[A]
Nitrosomonas
[B]
Nitrososcoccus
[C]
Nitrobacter
[D]
Clostridium
(16)
Uridylylation and deuridylylation of PII are brought about by a single enzyme
[A]
Adenylyltransferase
[B]
Glutamate synthase
[C]
Dinitrogenase
[D]
Uridylyltransferase
Answer: Uridylyltransferase
(17)
An intermediate of the citric acid cycle that undergoes reductive amination with glutamine as nitrogen donor is
[A]
α-ketoglutarate
[B]
Glutamine
[C]
NADPH
[D]
All of above
(18)
Conversion of nitrogen to ammonia or nitrogenous compounds is termed as
[A]
Nitrification
[B]
Denitrification
[C]
Nitrogen fixation
[D]
All of these
Answer: Nitrogen fixation
(19)
Plants absorbs N2 in the form of
[A]
Nitrites (NO2-)
[B]
Nitrates (NO3-)
[C]
Ammonium (NH4+)
[D]
All Of The Above
(20)
Symbiotic N2 fixing cyanobacteria are present in all except
[A]
Gnetum
[B]
Anthoceros
[C]
Azolla
[D]
None of these
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