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Test: Metabolism of Nitrogen (Old NCERT) - NEET MCQ


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Test: Metabolism of Nitrogen (Old NCERT) - Question 1

Nepenthes, Utricularia and Drosera all are

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 1

Insectivorous plants are green and otherwise autouophic plants, growing in nitrogen deficient soil. For their nitrogen nutrition, they behave like heterotrophic ayanisms. Such plants catch and digest small insects. e.g. Nepenthes, Sarracenia, Drosera, Utricularia, etc. 

Test: Metabolism of Nitrogen (Old NCERT) - Question 2

Leghaemoglobin is produced in response to

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 2

Leghaemoglobin (Lb) is a red-pink pigment produced by root hair cell after being affected by Rhizobium bacteria. Leghaemoglobin regulates O2 supply by creating anaerobic environment in the cell so that nitrogen fixing enzyme nitrogenase functions properly.

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Test: Metabolism of Nitrogen (Old NCERT) - Question 3

Which of the following is a non-symbiotic nitrogen fixing prokaryote?

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 3

Non symbiotic nitrogen fixing bacteria, e.g., Azotobacter, Beijerinckia (both aerobic) and Bacillus, Klebsiella, Clostridium (all anaerobic) are saprotrophic bacteria that perform nitrogen fixation.

Test: Metabolism of Nitrogen (Old NCERT) - Question 4

A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element will be replenished by doing so?

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 4

Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick walled cysts, play important role in fixing atmospheric nitrogen, hence increasing fertility of soil by replenishing nitrogen in soil.

Test: Metabolism of Nitrogen (Old NCERT) - Question 5

Select the option which completes the given equation for reductive amination.

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 5

In this reaction, ammonia combines with a keto acid. The most important keto acid is the alpha ketoglutaric acid produced during the operation of Krebs cycle. The keto acid then undergoes enzymatic reductive amination to produce an amino acid. The enzyme is glutamate dehydrogenase.
Thus, the correct answer is 'i-alpha-ketoglutaric acit, ii- glutamate dehdrogenase.'

Test: Metabolism of Nitrogen (Old NCERT) - Question 6

Nitrogen and hydrogen combine to form ammonia under high temperature and pressure conditions. This is an example of

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 6

In industrial orabiological nitrogenfixation, ammonia is produced industrially by direct combination of nitrogen with hydrogen (obtained from water) at high temperature and pressure. It is then changed into various types of fertilisers including urea.

Test: Metabolism of Nitrogen (Old NCERT) - Question 7

The process of conversion of atmospheric free N2 gas to nitrogenous compounds like NH3, is termed as

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 7

Nitrogen fixation is the conversion of inert atmospheric nitrogen or dinitrogen (N2) into utilisable compounds of nitrogen like nitrate, ammonia, amino acids. Nitrogen fixation can be atmospheric, industrial or biological.

Test: Metabolism of Nitrogen (Old NCERT) - Question 8

Decomposition of organic nitrogen of dead plants and animals into ammonia is called: 

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 8

Ammonification is carried out by decay causing organisms. They act upon nitrogenous excretions and proteins of dead bodies of living organisms. Proteins are first broken up into amino acids. The latter are deaminated. Organic acids released in the process are used by microorganisms for their own metabolism. Examples of ammonifying bacteria are Bacillus ramosus, B. vulgaris, B. mesentericus. Streotomyces. 

Test: Metabolism of Nitrogen (Old NCERT) - Question 9

Select the mismatched pair.

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 9

Frankia is a symbiotic N2-fixing bacterium present in the root nodulus of several non-legume plants such as Casuarine, Myrica and Alnus. Aulosira is a free-living N2-fixing cynobacterium.

Test: Metabolism of Nitrogen (Old NCERT) - Question 10

Symbiotic bacteria are found in the root nodules of members of Family

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 10

Nodulated root is the character of the pea family or leguminosae family because nodules are found for nitrogen fixation. The host plant developed specialized organs called root nodules. The host plants are mostly legumes in which symbiotic microorganism, generally a diazotrophic bacterium, reduces to ammonium. Nodulation is a host-specific process with each rhizobium having defined host-plant range.

Test: Metabolism of Nitrogen (Old NCERT) - Question 11

Which one is the major constituent of proteins, nucleic acids, vitamins and hormones?

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 11

Nitrogen is the constituent of proteins, protoplasm, nucleic acids, vitamins, hormones, etc. Nitrogen is required by all parts of a plant, particularly the meristematic tissues and the metabolically active cells.

Test: Metabolism of Nitrogen (Old NCERT) - Question 12

All N2 fixers belong to

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 12

Biological N2-fixation is mainly carried out by Eubacteria (Bacteria and Cyanobacteria) belonging to Kingdom Monera.

Test: Metabolism of Nitrogen (Old NCERT) - Question 13

The process that is the opposite of nitrogen fixation is

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 13

Denitrification is the opposite process of nitrogen fixation in which nitrates (NO3) get converted into N2 gas by bacteria Pseudomonas denitrificans and Thiobacillus denitrificans.

Test: Metabolism of Nitrogen (Old NCERT) - Question 14

During N2 fixation, reduction of one molecule of nitrogen into 2 molecules of NH3 consumes__ molecules of ATP.

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 14

The chemical equation of nitrogen fixation can be summarised as :

ATPs  are provided by photosynthesis and respiration.

Test: Metabolism of Nitrogen (Old NCERT) - Question 15

If by radiation all nitrogenase enzyme is inactivated, then there will be no

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 15

The enzyme nitrogenase is a Mo-Fe protein and catalyses the conversion of atmospheric N2 to NH3. If this enzyme is inactivated, then there will be no fixation of nitrogen in legumes.

Test: Metabolism of Nitrogen (Old NCERT) - Question 16

N2-fixing blue-green alga Anabaena which is extensively used in rice cultivation, forms symbiotic association with

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 16

Symbiotic assiciation has been found between Anabaena (blue green alga) and Azolla (a water fern). Azolla pinnata has anabeana azollae in its fronds. It is often inoculated to rice fields for nitrogen fixationl. It is an efficient fertiliser of paddy fierlds. Estimates of the annual quantities of N2 fixed by Azolla range between 120 and 312 kg nitrogen per hactare.

Test: Metabolism of Nitrogen (Old NCERT) - Question 17

Which of the following statements is incorrect about leghaemoglobin?

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 17

It is the enzyme nitrogenase which is a Mo-Fe protein not leghaemoglobin.

Test: Metabolism of Nitrogen (Old NCERT) - Question 18

Refer to the given reaction. What does it depict?

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 18

Transamination is  very important reaction for amino acid biosynthesis. The reaction involves transfer of amino group from already synthesized amino acid to the keto acid. The reaction is catalyzed by enzymes called transaminases. A large number of amino acids are synthesized by this transamination reaction. Amino acids are organic molecules containing nitorgen. The incorporation of amino group from ammonium into keto acids represents the major step for synthesis of nitrogenous organic biomolecules.

Thus, the correct answer is 'Transamination.'

Test: Metabolism of Nitrogen (Old NCERT) - Question 19

The bacterium ____ belonging to group Actinomycetes produces N2 -fixing nodules on the roots of non-leguminous plants(e.g. Alnus).

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 19

Frankia is a Gram-positive species of actinomycete filamentous bacterium that lives in symbiosis with actinorhizal plants of the genus Alnus. It is a nitrogen-fixing bacterium and forms nodules on the roots of non-leguminous trees. 
Thus, the correct answer is 'Frankia.'

Test: Metabolism of Nitrogen (Old NCERT) - Question 20

The cofactor of nitrate reductase Is

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 20

Reduction of nitrate to nitrite is carried out by the agency of an inducible enzyme called nitrate reductase. The enzyme is a molybdoflavoprotein (with a cofactor Mo). It requires a reduced coenzyme (NADH or NADPH) for its activity. The reduced coenzyme is brought in contact with nitrate by FAD or FMN.

Test: Metabolism of Nitrogen (Old NCERT) - Question 21

Read the following statements and select the incorrect ones.
(i) The co-ordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners.
(ii) Leguminous roots secrete chemical attractants that attract Rhizobium bacteria living nearby.
(iii) N, P and K usually do not get deficient in soil due to their low plant requirement.
(iv) Nitrogen cycle is regular circulation of nitrogen amongst living organisms with its reservoir pool in lithosphere and cycling pool in atmosphere.

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 21

Nitrogen (N), phosphorus (P) and potassium (K) are referred to as critical elements for crop plants because they become easily deficient in the soil due to higher plant requirement and repeated cultivation. Nitrogen cycle is regular circulation of nitrogen amongst living organisms, with its reservoir pool in atmosphere and cycling pool in lithosphere.

Test: Metabolism of Nitrogen (Old NCERT) - Question 22

The limiting factor in nitrogen fixation of soil is

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 22

Extreme of soil pH affects nodulation by reducing the colonisation of soil and the legume rhizosphere by rhizobia. Highly acidic soils (pH < 4.0) frequently have low levels of phosphorus, calcium and molybdenum and high concentration of toxic elements. While highly alkaline soils (pH > 8.0) tend to be high in sodium chloride, bicarbonate and borate, and are often associated with high salinity which reduce nitrogen fixation.

Test: Metabolism of Nitrogen (Old NCERT) - Question 23

Nitrifying bacteria

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 23

Nitrifying bacteria involves the oxidation of ammonia to nitrates through nitrites called nitrification. Nitrite bacteria (Ntirosomoncts and Nitrococcus) convert ammonia to nitrites whereas, nitrate bacteria (Nitrobacter and Nitrocystis) convert nitrite to soluble nitrates.

Test: Metabolism of Nitrogen (Old NCERT) - Question 24

In Nepenthes (pitcher plant), the pitcher is formed due to modification of

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 24

In Nepenthes the pitchers are meant for catching and digesting insects. The lamina is modified into pitcher. The leaf apex gives rise to a coloured lid for attracting the insects.

Test: Metabolism of Nitrogen (Old NCERT) - Question 25

______conditions are created by lagnaemoglobin in the root nodule of a legume.

Detailed Solution for Test: Metabolism of Nitrogen (Old NCERT) - Question 25

Leghaemoglobin is responsible for creating anaerobic conditions in the root nodules of the legume plant. It acts as an oxygen scavenger, protecting enzyme nitrogenase to come in contant with oxygen and help in the proper functioning of enzyme, i.e., conversion of atmospheric nitrogen to ammonia (NH3).

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