Nitrogen fixation is a process of (1) Assimilation of nitrate (2) Utilisation of nitrogen gas (3) Conversion of organic nitrogen to proteins (4) Conversion of molecular nitrogen to ammonia

Nitrogen fixation is a process of (1) Assimilation of nitrate (2) Utilisation of nitrogen gas (3) Conversion of organic nitrogen to proteins (4) Conversion of molecular nitrogen to ammonia
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Conversion of molecular nitrogen to ammonia
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Nitrogen fixation is a process of - (1) Assimilation of nitrate (2) Utilisation of nitrogen gas (3) Conversion of organic nitrogen to proteins (4) Conversion of molecular nitrogen to ammonia

Description : Nitrogen fixation is a process of - (1) Assimilation of nitrate (2) Utilisation of nitrogen gas (3) Conversion of organic nitrogen to proteins (4) Conversion of molecular nitrogen to ammonia

Last Answer : (4) Conversion of molecular nitrogen to ammonia Explanation: Nitrogen fixation is a process by which nitrogen in the Earth's atmosphere is converted into ammonia (NH3) or other molecules available ... plants as nutrients. The conversion of organic nitrogen to proteins is achieved in Nitrogen cycle.

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (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 root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Last Answer : (d) Anaerobic ammonium oxidation and denitrification

If by radiation all nitrogenase enzyme are inactivated, then there will be no (a) fixation of nitrogen in legumes (b) fixation of atmospheric nitrogen (c) conversion from nitrate to nitrite in legumes (d) conversion from ammonium to nitrate in soil.

Description : If by radiation all nitrogenase enzyme are inactivated, then there will be no (a) fixation of nitrogen in legumes (b) fixation of atmospheric nitrogen (c) conversion from nitrate to nitrite in legumes (d) conversion from ammonium to nitrate in soil.

Last Answer : (a) fixation of nitrogen in legumes

(3) Conversion of ammonia to nitrites Explanation: Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The oxidation of ammonia into nitrite is performed by two groups of organisms, ammonia-oxidizing bacteria AOB) and ammonia-oxidizing archaea (AOA). Nitrification is an important step in the nitrogen cycle in soil.

Description : (3) Conversion of ammonia to nitrites Explanation: Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The oxidation of ammonia ... -oxidizing archaea (AOA). Nitrification is an important step in the nitrogen cycle in soil.

Last Answer : Acid rain is caused due to pollution of atmosphere by – (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these

Under anaerobic conditions, bacterium Pseudomonas changes (a) Nitrate to molecular nitrogen (b) Nitrate to ammonia (c) Nitrate to nitrite (d) Nitrite to nitrate

Description : Under anaerobic conditions, bacterium Pseudomonas changes (a) Nitrate to molecular nitrogen (b) Nitrate to ammonia (c) Nitrate to nitrite (d) Nitrite to nitrate

Last Answer : Ans. ((a))

Pick out the wrong statement. (A) Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water (B) Apatite is the principal material present in phosphate rock which is chemically Ca10 (PO4 )6 (F, Cl, OH) (C) Urea is more hygroscopic than ammonium nitrate (D) Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound fo

Description : Pick out the wrong statement. (A) Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water (B) Apatite is the principal material present in ... fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound fo

Last Answer : (C) Urea is more hygroscopic than ammonium nitrate

Incorporation of atmospheric N2to NH4 + occurs via the process of A.assimilatory nitrate reduction B.transamination C.deamination D.nitrogen fixation

Description : Incorporation of atmospheric N2to NH4 + occurs via the process of A.assimilatory nitrate reduction B.transamination C.deamination D.nitrogen fixation

Last Answer : D.nitrogen fixation

Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom? (1) Nitrite (2) Ammonia (3) Nitrate (4) Laughing gas

Description : Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom? (1) Nitrite (2) Ammonia (3) Nitrate (4) Laughing gas

Last Answer : (2) Ammonia

0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?

Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?

Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%

The percentage of food nitrogen that is retained in the body represents (A) Digestibility coefficient (B) Biological value of proteins (C) Protein efficiency ratio (D) Net protein utilisation

Description : The percentage of food nitrogen that is retained in the body represents (A) Digestibility coefficient (B) Biological value of proteins (C) Protein efficiency ratio (D) Net protein utilisation

Last Answer : Answer : D

The percentage of nitrogen retained in the body after absorption of diet represents (A) Digestibility coefficient of proteins (B) Biological value of proteins (C) Protein efficiency ratio (D) Net protein utilisation

Description : The percentage of nitrogen retained in the body after absorption of diet represents (A) Digestibility coefficient of proteins (B) Biological value of proteins (C) Protein efficiency ratio (D) Net protein utilisation

Last Answer : Answer : B

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation? (a) Leghaemoglobin scavenges oxygen and is pinkish in colour. (b) Nodules act as sites for nitrogen fixation. (c) The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3. (d) Nitrogenase is insensitive to oxygen.

Description : Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation ... the conversion of atmospheric N2 to NH3. (d) Nitrogenase is insensitive to oxygen.

Last Answer : (d) Nitrogenase is insensitive to oxygen.

Which of the process is known as nitrification? (1) Reaction of Nitrogen Monoxide with oxygen to form nitric acid (2) Reaction of nitrogen dioxide with water to form nitric acid (3) Conversion of ammonia to nitrites (4) Conversion of nitrite to nitric oxide

Description : Which of the process is known as nitrification? (1) Reaction of Nitrogen Monoxide with oxygen to form nitric acid (2) Reaction of nitrogen dioxide with water to form nitric acid (3) Conversion of ammonia to nitrites (4) Conversion of nitrite to nitric oxide

Last Answer : Conversion of ammonia to nitrites

Which of the following nitrogen-containing compounds is most readily used by plants? w) nitrogen dioxide x) ammonia y) nitrous oxide z) nitrate

Description : Which of the following nitrogen-containing compounds is most readily used by plants? w) nitrogen dioxide x) ammonia y) nitrous oxide z) nitrate

Last Answer : ANSWER: Z -- NITRATE

The first stable product of fixation of atmospheric nitrogen in leguminous plants is (a) NO3 − (b) glutamate (c) NO2 − (d) ammonia

Description : The first stable product of fixation of atmospheric nitrogen in leguminous plants is (a) NO3 − (b) glutamate (c) NO2 − (d) ammonia

Last Answer : (c) NO2

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in (A) Coagulation and flocculation of colloids (B) Oxidation of carbonaceous matter to CO2 (C) Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate (D) All (A), (B) and (C)

Description : Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in (A) Coagulation and flocculation of colloids (B) Oxidation of carbonaceous matter to CO2 (C) ... to the nitrite and eventually to the nitrate (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The process of conversion of nitrogen `(N_(2))` to ammonia is termed as

Description : The process of conversion of nitrogen `(N_(2))` to ammonia is termed as

Last Answer : The process of conversion of nitrogen `(N_(2))` to ammonia is termed as

Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia? (1) 18 (2) 17 (3) 16 (4) 15

Description : Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia? (1) 18 (2) 17 (3) 16 (4) 15

Last Answer : (2) 17 Explanation: Ammonia (NH3) is composed of one atom of Nitrogen and three Hydrogen atoms. This means that its molar mass of ammonia will be the sum of the molar mass of one nitrogen atom and three times the molar mass of a hydrogen atom.

Maximum nitrogen percentage is in (A) Ammonium sulphate (B) Calcium ammonium nitrate (C) Urea (D) Liquid ammonia

Description : Maximum nitrogen percentage is in (A) Ammonium sulphate (B) Calcium ammonium nitrate (C) Urea (D) Liquid ammonia

Last Answer : (D) Liquid ammonia

Which one of the following tests employs ferroin indictor ? (a) Chemical oxygen demand (b) Ammonia nitrogen (c) Nitrate nitrogen (d) Fluoride

Description : Which one of the following tests employs ferroin indictor ? (a) Chemical oxygen demand (b) Ammonia nitrogen (c) Nitrate nitrogen (d) Fluoride

Last Answer : (a) Chemical oxygen demand

Conversion of soil nitrate into gaseous nitrogen is

Description : Conversion of soil nitrate into gaseous nitrogen is

Last Answer : Ans. Denitrification

The main role of bacteria in the carbon cycle involves (a) chemosynthesis (b) digestion or breakdown of organic compounds (c) photosynthesis (d) assimilation of nitrogenous compounds.

Description : The main role of bacteria in the carbon cycle involves (a) chemosynthesis (b) digestion or breakdown of organic compounds (c) photosynthesis (d) assimilation of nitrogenous compounds.

Last Answer : (b) digestion or breakdown of organic compounds

The main role of bacteria in the carbon cycle involves (a) chemosynthesis (b) digestion or breakdown of organic compounds (c) photosynthesis (d) assimilation of nitrogenous compounds.

Description : The main role of bacteria in the carbon cycle involves (a) chemosynthesis (b) digestion or breakdown of organic compounds (c) photosynthesis (d) assimilation of nitrogenous compounds.

Last Answer : (b) digestion or breakdown of organic compounds

Nitrification is the biological process of converting – (1) N9 into nitrate (2) N2 into nitrite (3) Ammonia into nitrite (4) Ammonia into N2

Description : Nitrification is the biological process of converting – (1) N9 into nitrate (2) N2 into nitrite (3) Ammonia into nitrite (4) Ammonia into N2

Last Answer : (3) Ammonia into nitrite Explanation: Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The transformation of ammonia ... limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil.

Nitrification is the biological process of converting (1) N2 into nitrate (2) N2 into nitrite (3) Ammonia into nitrite (4) Ammonia into N2

Description : Nitrification is the biological process of converting (1) N2 into nitrate (2) N2 into nitrite (3) Ammonia into nitrite (4) Ammonia into N2

Last Answer : Ammonia into nitrite

In India the problem of utilisation of agricultural wastes is in (a) Conversion of cellulose into sugar (b) Conversion of bran into molasses (c) Conversion of starch into alcohol (d) Conversion of sugar into carbohydrates

Description : In India the problem of utilisation of agricultural wastes is in (a) Conversion of cellulose into sugar (b) Conversion of bran into molasses (c) Conversion of starch into alcohol (d) Conversion of sugar into carbohydrates

Last Answer : Ans: (a)

During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about __________ percent. (A) 38 (B) 68 (C) 82 (D) 98

Description : During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about __________ percent. (A) 38 (B) 68 (C) 82 (D) 98

Last Answer : (D) 98

In a person increase in weight in gms per gm of protein consumption represents (A) Protein efficiency ratio (B) Digestibility value of proteins (C) Biological value of proteins (D) Net protein utilisation

Description : In a person increase in weight in gms per gm of protein consumption represents (A) Protein efficiency ratio (B) Digestibility value of proteins (C) Biological value of proteins (D) Net protein utilisation

Last Answer : Answer : A

Organic substance of large molecular size is (A) Starch (B) Insulin (C) Lipids (D) Proteins

Description : Organic substance of large molecular size is (A) Starch (B) Insulin (C) Lipids (D) Proteins

Last Answer : Answer : D

Plants absorb dissolved nitrates from soil and convert them into (a) Free nitrogen (b) Urea (c) Ammonia (d) Proteins

Description : Plants absorb dissolved nitrates from soil and convert them into (a) Free nitrogen (b) Urea (c) Ammonia (d) Proteins

Last Answer : Ans:(a)

Nitrifying bacteria (a) oxidise ammonia to nitrates (b) convert free nitrogen to nitrogen compounds (c) convert proteins into ammonia (d) reduce nitrates to free nitrogen.

Description : Nitrifying bacteria (a) oxidise ammonia to nitrates (b) convert free nitrogen to nitrogen compounds (c) convert proteins into ammonia (d) reduce nitrates to free nitrogen.

Last Answer : (a) oxidise ammonia to nitrates

For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia acid absorbed in 60 mL of `M/10`

Description : For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia acid absorbed in 60 mL of `M/10`

Last Answer : For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia ... ` B. `10%` C. `3%` D. `5%`

In sewage having fully oxidised organic matter, the nitrogen exists in the form of A. Nitrites B. Nitrates C. Free ammonia D. Aluminoid nitrogen

Description : In sewage having fully oxidised organic matter, the nitrogen exists in the form of A. Nitrites B. Nitrates C. Free ammonia D. Aluminoid nitrogen

Last Answer : ANS: B

Kjeldahl nitrogen is a mixture of A. Ammonia and nitrogen B. Nitrogen and organic nitrogen C. Organic nitrogen and ammonia D. All the above

Description : Kjeldahl nitrogen is a mixture of A. Ammonia and nitrogen B. Nitrogen and organic nitrogen C. Organic nitrogen and ammonia D. All the above

Last Answer : ANS: D

The percentage of ingested protein/ nitrogen absorbed into blood stream is known as (A) Net protein utilisation (B) Protein efficiency ratio (C) Digestibility coefficient (D) Biological value of protein

Description : The percentage of ingested protein/ nitrogen absorbed into blood stream is known as (A) Net protein utilisation (B) Protein efficiency ratio (C) Digestibility coefficient (D) Biological value of protein

Last Answer : Answer : C

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant? (a) CAM (b) Nitrogen fixer (c) C3 (d) C4

Description : A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following ... you assign this plant? (a) CAM (b) Nitrogen fixer (c) C3 (d) C4

Last Answer : d) C4

Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process. (A) Haber's (B) Stengel (C) Le-chatelier's (D) Du-pont's

Description : Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process. (A) Haber's (B) Stengel (C) Le-chatelier's (D) Du-pont's

Last Answer : (B) Stengel

Which of the following is the main nitrogenous waste in humans ? (1) Ammonia (2) Urea (3) Uric Acid (4) Ammonium Nitrate

Description : Which of the following is the main nitrogenous waste in humans ? (1) Ammonia (2) Urea (3) Uric Acid (4) Ammonium Nitrate

Last Answer : Uric Acid

“Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Description : “Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Last Answer : b. B Nitrogen

“Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Description : “Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Last Answer : b. B Nitrogen

What The process of nitrogen fixation involved?

Description : What The process of nitrogen fixation involved?

Last Answer : Changing it from a gas (N2) into a compound (often with O2

"Mulching" is the term used for the process of (a) Covering the roots of plants with loose material, dung, etc. in order to protect them from soil erosion etc. (b) Breaking down big pieces of soil into small ones (c) Transplanting of paddy seedlings (d) Nitrogen fixation of soil by use of fertilizers

Description : "Mulching" is the term used for the process of (a) Covering the roots of plants with loose material, dung, etc. in order to protect them from soil erosion etc. (b) Breaking down big pieces ... into small ones (c) Transplanting of paddy seedlings (d) Nitrogen fixation of soil by use of fertilizers

Last Answer : Ans: (a)

The process of nitrogen fixation in organ- isms is controlled by which gene?

Description : The process of nitrogen fixation in organ- isms is controlled by which gene?

Last Answer : Nifgenes

The process in which nitrogen is released into the atmosphere is (1) Ammonification (2) Denitrification (3) Biological nitrogen Fixation (4) Nitirification

Description : The process in which nitrogen is released into the atmosphere is (1) Ammonification (2) Denitrification (3) Biological nitrogen Fixation (4) Nitirification

Last Answer :  Biological nitrogen Fixation 

What is Nitrogen Fixation ?

Description : What is Nitrogen Fixation ?

Last Answer : The largest source of nitrogen is the atmosphere. 6% (volumetric) nitrogen of the atmosphere. We cannot use nitrogen directly from the atmosphere. So for convenience of use, we do not usually convert ... . There are two methods of nitrogen fixation - 1. Natural methods and II. Synthetic method.

Proteins are most complex organic compounds, containing a. Carbon b. Hydrogen c. oxygen and nitrogen d. All of these

Description : Proteins are most complex organic compounds, containing a. Carbon b. Hydrogen c. oxygen and nitrogen d. All of these

Last Answer : All of these

Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric acid) 7. Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3

Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature (A) Rate of reaction is very low (B) Very high pressure is required resulting in costly pressure vessel (C) Space velocity of gas is very low resulting in decreased conversion (D) None of these

Description : Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature (A) Rate of reaction is very low ... (C) Space velocity of gas is very low resulting in decreased conversion (D) None of these

Last Answer : (A) Rate of reaction is very low

Example of associative social process isA. Assimilation B. Conflict C. Competition D. None of the above

Description : Example of associative social process is A. Assimilation B. Conflict C. Competition D. None of the above

Last Answer : A. Assimilation

Inside the ____ is a gas generator containing a mixture of NaN3 (Sodium Azide), KNO3 (Potassium Nitrate) and SiO2 (Silicon Dioxide). When the undesired event happens, an electric circuit is turned on by a sensor, and a series of chemical reactions generate nitrogen gas that fills ____ in 20 to 30 milliseconds. Fill up the blank

Description : Inside the ____ is a gas generator containing a mixture of NaN3 (Sodium Azide), KNO3 (Potassium Nitrate) and SiO2 (Silicon Dioxide). When the undesired event happens, an electric circuit is ... chemical reactions generate nitrogen gas that fills ____ in 20 to 30 milliseconds. Fill up the blank

Last Answer : Air-bags in automobiles.