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![Page 1: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/1.jpg)
NEETREVISIONSERIES
MINERALNUTRITION
ReviseMostImportantQuestionstoCrackNEET2020
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Q-1-13842899
The technique of growing plants in a nutrients solution, in complete
absence of soil is called as
(A)aeroponics
(B)waterculture
(C)hydroponics
(D)soilculture
CORRECTANSWER:C
SOLUTION:
Cultivationofplantsbyplacingtherootsinthenutrient
![Page 2: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/2.jpg)
solution(incompleteabsenceofsoil)iscalled
hydroponics.Itisnecessarytoaeratethesolutionto
providerootswithadequateoxygensuppyltheresylt
obtainedfromsoil-lessculturemaythenbeusedto
determiniedeficienciesunderfieldconditions.
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Q-2-17820135
Aeroponic is also called as
(A)Soillesscultivationofplants
(B)Parthenocaropy
(C)Vivipary
(D)Phytotron
CORRECTANSWER:A
![Page 3: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/3.jpg)
SOLUTION:
Aeroponicplantsaregrownwiththeirrootsbatherdin
nutrientmist.Thismethodhadbeensuccessfullyusedin
growingCitrusandoliveplants
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Q-3-17820138
Which one of the following scientists used the nutrient culture
solution in hydroponic cultures
(A)Sachs
(B)Webster
(C)Wallace
(D)Knop
SOLUTION:
![Page 4: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/4.jpg)
Thenutrientsolutioncompositionproposedbyknop
(1865)andArnonandHoagland's(1940)arecommonly
used.
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Q-4-13842939
Necrosis refers to
(A)Inhibitionofcelldivision
(B)delayinflowering
(C)deathoftissues
(D)fallingofleaves.
CORRECTANSWER:C
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Q-5-17820124
Inorganic nutrients are presents in the soil in the form of
(A)Molecules
(B)Atoms
(C)Electricallychargedions
(D)Parasite
CORRECTANSWER:C
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Q-6-13842913
Select the option that contains micronutrients only
(A)Mn,Mo,Zn
![Page 6: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/6.jpg)
(B)C,H,N
(C)N,P,O
(D)Mn,K,S
CORRECTANSWER:A
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Q-7-17820268
The first stable product of fixation of atmospheric nitrogen in
leguminous plants is
(A)Glutamate
(B)
(C)Ammonia
(D)
NO−2
NO−3
![Page 7: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/7.jpg)
CORRECTANSWER:C
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Q-8-17820144
In which of the following forms is iron absorbed by plants
(A)Ferric
(B)Ferrous
(C)Freeelement
(D)Bothferricandferrous
CORRECTANSWER:A
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Q-9-17820367
An example of a parasitic plant that is also strictly epiphytic is
![Page 8: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/8.jpg)
(A)Cuscuta(dodder)
(B)Viscum(mistletoe)
(C)Refflesia
(D)Orobanche
CORRECTANSWER:B
SOLUTION:
Viscumisapartialstemparasitewithedibleberries
havingstickypulp
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Q-10-17820210
Gray speck disease in oats takes place by the distance deficiency of
(A)Zinc
![Page 9: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/9.jpg)
(B)Copper
(C)Potassium
(D)Manganese
CORRECTANSWER:D
SOLUTION:
"Greyspeckdisease"inoatappearsduetothe
deficiencyofmaganese,whichleadstototalfailureof
crop.
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Q-11-13842931
Select the incorrectly matched pair.
(A)Magnesium(Mg)-Formationofmitoticspindle
![Page 10: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/10.jpg)
(B)Iron(Fe)-Formationofchlorophyll
(C)Chlorine(Cl)-Anioncationbalanceinthecell
(D)Sulphur(S)-Componentofvitamins
CORRECTANSWER:A
SOLUTION:
Majorfunctionofmagnesium isformationof
chlorophyll,carotenoidsandnucleic,acids,growth,
metabolismandnoduleformationinlegumes is
involvedintheorganisationofmitoticspindle.
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Q-12-40377997
What happens when we inoculate Rhizobium in wheat field?
(A)Noincreaseinproduction(nitrogencontentofsoil
(Mg2+ )
Ca2+
![Page 11: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/11.jpg)
remainssame)
(B)Alotofincreaseinproduction(nitrogencontentof
soilincrease)
(C)Fertilityofsoildecreases
(D)Fertilityofsoilincreases
CORRECTANSWER:A
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Q-13-17820157
The possible resource of phosphorus ions and nitrogen ions in soil
generally get depleted because they are usually found as
(A)Positivelychargedions
(B)Negativelychargedions
(C)Adisproportionatemixtureofnegativelycharged
![Page 12: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/12.jpg)
ions
(D)Particlescarryingnocharge
SOLUTION:
Phosphorusisabsorbedbytheplantsfromthesoilinthe
formofphosphateions and and
nitrogenisabsorbedbytheplantsintheformofnitrate
ions
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Q-14-13842959
Which one is the major constituent of proteins, nucleic acids,
vitamins and hormones?
(A)P
(B)N
H2PO−4 HPO2−4
(NO−3 )
![Page 13: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/13.jpg)
(C)K
(D)S
CORRECTANSWER:B
SOLUTION:
Nitrogenistheconstituentofproteins,protoplasm,
nucleicacids,vitamins,hormones,etc.Nitrogenis
requiredbyallpartsofaplant,particularlythe
meristematictissuesandthemetabolicallyactivecells.
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Q-15-17820320
EDTA is much used in tissue cultures, it is a
(A)Hormone
(B)Vitamin
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(C)Buffer
(D)Nutrient
CORRECTANSWER:C
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Q-16-13843042
Match the element with its associated functions/roles and choose
the correct option among given below.
(A)A-(i),B-(ii),C-(iii),D-(iv),E-(v)
A. Boron (i). Splittingof H2O
toliberate O2 duringB. Manganese (ii)
.Neededforsynthesisofauxins
C. Molybdenum (iii). componentofnitrogenase
D. Zinc (iv). Pollengermination
E. Iron (v). Componentofferedoxin
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(B)A-(iv),B-(i),C-(iii),D-(ii),E-(v)
(C)A-(iii),B-(ii),C-(iv),D-(v),E-(i)
(D)A-(ii),B-(iii),C-(v),D-(i),E-(iv)
CORRECTANSWER:B
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Q-17-17820194
In a Citrus plantation, all the plants were found to be suffering from
the die-back, spraying of fungicides was of no help. This problem
was due to the deficiency of
(A)Copper
(B)Gibberellicacid
(C)Zinc
(D)Auxins
![Page 16: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/16.jpg)
SOLUTION:
Cudeficiencycausesnecrosisofthetipoftheyoung
leaves(e.g.,Citrus).Thediseaseiscalled'dieblock'
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Q-18-13842945
Premature leaf fall is due to deficiency of
(A)sodium
(B)potassium
(C)zinc
(D)phosphorus.
CORRECTANSWER:D
SOLUTION:
![Page 17: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/17.jpg)
Phosphorus(P)deficiencycausesprematureleaffall.
Deadnecroticareasdeveloponleavesorfruts,and
leavesturndarktoblue-greenincolour.Italsocauses
delayinseedgermination.
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Q-19-17820169
The major role of phosphorus in plant metabolism is
(A)Togeneratemetabolicenergy
(B)Toevolveoxygenduringphotosynthesis
(C)Toevolvecarbondioxideduringrespiration
(D)Tocreateanaerobicconditions
SOLUTION:
Phosphorusplaysanindispensableroleinenergy
![Page 18: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/18.jpg)
metabolisme.e.,hydrolysisofpyrophosphateand
variousorganicphosphatebondsbeingusedtodrive
chemicalreactions.Thusitisrequiredforall
phosphorylationreactions.
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Q-20-40377999
Which of the following is a trace element ?
(A)S
(B)Mg
(C)Cu
(D)P
CORRECTANSWER:C
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Q-21-13842933
Deficiency symptoms of readily mobilised essential elements will
first appear in_____
(A)youngertissues
(B)oldertissues
(C)roots
(D)shoots
CORRECTANSWER:B
SOLUTION:
Forelementsthatareactivelymobilisedwithintheplants
andexportedtoyoungdevelopingtissues,thedeficiency
symptomstendtoappearfirstintheoldertissuese.g.,
thedeficiencysymptomsofnitrogen(N),potassium(K)
![Page 20: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/20.jpg)
andmagnesium(Mg)arevisiblefirstinthesenescent
leaves.intheolderleaves,biomoleculescontaining
theseelementsarebrokendown,makingthseelements
availableformobilisingtoyoungerleaves.
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Q-22-40377949
The translocation of solute is
(A)Equaltotherateoftranslocationofwater
(B)Dependentontranspirationpull
(C)Throughxylemvessel
(D)Allofthese
CORRECTANSWER:D
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Q-23-17820267
Higher plants obtain nitrogen from soil that has
(A)Sixforms
ofnitrogenwithoxidationnumberrangingfrom
(B)Sixforms
ofnitrogenwithoxidationnumberrangingfrom
(C)Fiveforms
ofnitrogenwithoxidationnumberrangingfrom
(D)Fiveforms
(NO3,NO2, N2,N2O,
N2OH, NH3)
+5 → − 3
(NO3,NO2, N2O2,
N2, NH2OH,NH3)
+6 → − 3
(NO3,NO2, N2,
NH2OH, NH3)
+5 → − 3
![Page 22: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/22.jpg)
ofnitrogenwithoxidationnumberrangingfrom
CORRECTANSWER:C
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Q-24-40377955
Cell division in root nodules is promoted by _________ secreted by
plant and ________ secreted by bacteria.
(A)Auxin,Cytokinin
(B)Cytokinin,Auxin
(C)Auxin,Leghemoglobin
(D)Nitrogenase,Leghemoglobin
CORRECTANSWER:A
(NO3,NO2, N2,
NH2OH, NH3)
+6 → − 3
![Page 23: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/23.jpg)
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Q-25-17820357
The ability of the venus fly trap of capture insects is due to
(A)Chemicalstimulationbytheprey
(B)Apassiveprocessrequiringnospecialabilityonthe
partoftheplant
(C)Specializedmuscle-likecells
(D)Rapidturgorpressurechanges
CORRECTANSWER:D
SOLUTION:
InDionaea(Venusflytrap)aninsectthathappensto
alightoverthelaminaandtouchasensitivespinetwice
inquicksuccessioncausesthefoldingofthelaminathe
![Page 24: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/24.jpg)
curvedmarginalspinesgetinterolockedandtheinsect
getstrapped
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Q-26-13842928
Best defined function of manganese in green plants is
(A)photolysisofwater
(B)Calvincycle
(C)Nitrogenfixation
(D)waterabsorption.
CORRECTANSWER:A
SOLUTION:
Manganeseisabsorbedintheformofmanganousions
![Page 25: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/25.jpg)
.Thebestdefinedfunctionofmanganeseisin
thesplittingofwatertoliberateoxygenduring
photosynthesis.
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Q-27-17820252
Which one of the following can fix atmospheric nitrogen directly
(A)Pea
(B)Brassica
(C)Castor
(D)Petunia
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Q-28-40377928
(Mn2+ )
![Page 26: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/26.jpg)
Which of the following groups of elements are mobile?
(A)Fe,Ca,B
(B)N,P,K
(C)B,K,Ca
(D)CaandK
CORRECTANSWER:B
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Q-29-17820282
Drosera catches insects by means of
(A)Bladder
(B)Pitcher
(C)Tentaclessecretingshiningliquid
![Page 27: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/27.jpg)
(D)Adhesivedisc
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Q-30-17820137
Who gave the criteria of essentiality
(A)R.Hill
(B)F.F.Blackman
(C)M.P.Kaushik
(D)D.L.Arnon
SOLUTION:
Criteriaforessentialityofelementswerefirstofallgiven
byArnon.
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Q-31-13842920
Which of the following essential elements plays an important role in
opening and closing of stomata?
(A)Mg
(B)K
(C)Mn
(D)P
CORRECTANSWER:B
SOLUTION:
Potassium(K)helpstodetermineanion-cationbalance
incells,andisinvolvedinproteinsynthesis,openingand
closingofstomata,activationofenzymes,and
maintenanceofturgidityofcells.ItisabsorbedasK +
![Page 29: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/29.jpg)
ionbyplantsfromthesoil
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Q-32-40377931
Which one of the following is a sulfur - containing amino acid?
(A)Valine
(B)Methionine
(C)Tryptophan
(D)Phenylalanine
CORRECTANSWER:B
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Q-33-13842927
Which of the following minerals activate the enzymes involved in
![Page 30: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/30.jpg)
respiration?
(A)Nitrogenandphosphorus
(B)Magnesiumandmanganese
(C)potassiumanedcalcium
(D)Sulphur
CORRECTANSWER:B
SOLUTION:
Magnesiumactivatestheenzymesofrespiration,
photosynthesisandisinvolvedinthesynthesisofDNA
andRNA.Manganeseactivatesmanyenzymeswhich
areinvolvedinphotosynthesis,respirationandnitrogen
metabolism.
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Q-34-17820276
Cuscuta is an example of
(A)Ectoparasitism
(B)Broodparasitism
(C)Predation
(D)Endoparasitism
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Q-35-13842937
Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is
caused by the deficiency of
(A)N,K,Mg
(B)S,Fe,Zn
![Page 32: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/32.jpg)
(C)Mn,Mo,Mg
(D)allofthese
CORRECTANSWER:D
SOLUTION:
Chlorosisisnon-developmentorlossofchlorophyll,that
leadstoyellowingofleaves.Chlorosisiscauseddurto
deficiencyofN,K,Mg,S,Fe,Mn,ZnandMo.
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Q-36-40378040
Which of the following is a flowering plant with nidules containing
filamentous nitrogen-fixing microorganism
(A)Cicerarietinum
(B)Casuarinaequisetifolia
![Page 33: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/33.jpg)
(C)Crotalariajuncaea
(D)Cycasrevolute
CORRECTANSWER:B
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Q-37-13843009
Which of the following statements is incorrect about
leghaemoglobin?
(A)inactsas scavenger
(B)itimpartspinkorredcolourtothenodules
(C)itcombineswith andprotectsnitrogenase.
(D)ItisaMo-Fe
CORRECTANSWER:D
O2
O2
![Page 34: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/34.jpg)
SOLUTION:
ItistheenzymenitrogenasewhichisaMo-Feprotein
notleghaemoglobin.
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Q-38-40378064
The function of leghaemoglobin in the root nodules of legumes is:-
(A)expressionofnifgene
(B)Inhibitionofnitrogenaseactivity
(C)oxygenremoval
(D)noduledifferentiation
CORRECTANSWER:C
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Q-39-17820353
Assertion : Exanthema disease occure due to deficiency of
manganese.
Reason : Reclamation is a disease of cereals
(A)Ifboththeassertionandthereasonaretrueandthe
reasonisacorrectexplanationoftheassertion
(B)Ifboththeassertionandreasonaretruebutthe
reasonisnotacorrectexplanationoftheassertion
(C)Iftheassertionistruebutthereasonisfalse
(D)Iftheassertionisfalsebutreasonistrue
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Q-40-13842942
Deficiency of which of the following elements delay flowering in
![Page 36: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/36.jpg)
plants?
(A)Fe,Mn,Mo
(B)N,S,Mo
(C)Ca,Mg,K
(D)N,K,S
CORRECTANSWER:B
SOLUTION:
Nitrogendeficiencycausesyellowingofolderleaves
(chlrosis).Deficiencyofnitrogenalsocausesdormancy
oflateralbuds,lateflowering,purplecolouratioand
wrinklingofcerealgrainsmolybdenumdeficiencycauses
chloroticinterveinalmottlingoftheolderleaves,flower
formationisinhibitedandalsocauseswhiptaildisease
incualiflowerplants.sulphurdeficiencycausesyellowing
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ofleavesanddelayinflowering.
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Q-41-40378015
"Reclamation" and "Little leaf" disease, caused by deficency of
(A)ZnandMo
(B)CuandZn
(C)CuandB
(D)MnandCu
CORRECTANSWER:B
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Q-42-13843054
Assertion: As per carbonic acid exchange theory of mineral salt
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absorption, released during respiration of roots forms
dissociates into and ions, where ions exchange
with anions adsorbed on clay particles.
(A)Ifbothassertioandreasonaretrueandreasonisthe
correctexplanationofassertion
(B)ifbothassertionandreasonaretruebutreasonis
notthecorrectexplanationofassertion
(C)ifassertionistruebutreasonisfalse
(D)ifbothassertionandreasonarefalse
CORRECTANSWER:C
SOLUTION:
Accordingtocarbonicacidexchangetheory,
releasedduringrespirationofrootscombineswithsoil
watertoproducecarbonicacid .Carbonicacid
CO2 H2SO3
H + HCO3 H +
CO2
(H2CO3)
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dissociatesinto and ionsinsoilsolution.
These ionsmaybeexchangedforcations
adsorbedonclayparticles.thecationsthsureleasedinto
soilsolutionfromtheclayparticles,maybeadsorbedon
rootcellsinexchangesfor ions.
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Q-43-40378056
The common nitrogen-fixer in paddy fields is
(A)Oscillatoria
(B)Frankia
(C)Rhizobium
(D)Azospirillum
CORRECTANSWER:D
H + HCO−3
H +
H +
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Q-44-13842974
Match column I with column II and select the correct option from
the given codes:
(A)A-(i),B-(ii),C-(iii)
(B)A-(i),B-(iii),C-(ii)
(C)A-(ii),B-(i),C-(iii)
(D)A-(ii),B-(iii),C-(i)
CORRECTANSWER:A
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ColumnI ColumnIIA
nitrosomonesNitrosococcus(i). Ammoniatonitrite
B Nitrobacter,Nitrocystic (ii). Nitritetonitrate
C Pseudomonas (iii). Nitrateto N2
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Q-45-13842944
Which of the following is not a deficiency symptoms of minerals?
(A)Internodeshortening
(B)Necrosis
(C)Chlrosis
(D)Etiolation
CORRECTANSWER:D
SOLUTION:
Etiolationistheabnormalformofgrowthobservedwhen
plantwsgrowindarknessorseverelyreducedlights.
Suchplantscharacteristicallyhavebranchedleavesand
shoots,excessivelylongshoots,andreducedleaves
andshoots,excessivelylongshoots,andreduced
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leavesandrootssystems.
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Q-46-40377918
Excess of manganese may induce the deficiencies of
(A)Iron
(B)Calcium
(C)Magnesium
(D)Allofthese
CORRECTANSWER:D
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Q-47-40377953
Which of the following is/are diazotrophs?
![Page 43: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/43.jpg)
(A)RhizobiumandAzotobacter
(B)FrankiaandKlebsiella
(C)AnbaenaandNostoc
(D)Allofthese
CORRECTANSWER:D
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Q-48-13842976
The limiting factor in nitrogen fixation of soil is
(A)soilnatrure(pH)
(B)light
(C)temperature
(D)air
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CORRECTANSWER:A
SOLUTION:
ExtremeofsoilpHaffectsnodulationbyreducingthe
colonisationofsoilandthelegumerhizosphereby
rhizobia.Highlyacidicsoils frequentlyhave
lowlevelsofphosphorus,calciumandmolybdenumand
highconcentrationoftoxicelementswhilehighlyalkaline
soils tendtobehighinsodiumchloride,
bicarbonateandborate,andareoftenassociatedwith
highsalinitywhichreducenitrogenfixation.
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Q-49-13842963
The process of conversion of atmospheric free gas to
nitrogenous compounds like is termed as
(pH < 4.0)
(pH > 8.0)
N2
NH3
![Page 45: Download Doubtnut Now...Watch Video Solution On Doubtnut App Q-13 - 17820157 The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they](https://reader035.vdocument.in/reader035/viewer/2022070214/6116fd259c288d760074e0f0/html5/thumbnails/45.jpg)
(A)nitrification
(B)nitratereduction
(C) fixation
(D)ammonification
CORRECTANSWER:C
SOLUTION:
Nitrogenfixationistheconvertionofinertatmospheric
nitrogenordinitrogen intoutilisablecompoundsof
nitrogenlikenitrate,ammonia,aminoacids.Nitrogen
fixationcanbeatmospheric,industrialorbiological.
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Q-50-17820257
Knot like bodies known as nodules found in the roots of groundnut
N2
(N2)
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plant are produced by
(A)Azospirillum
(B)Azotobacter
(C)Pseudomonas
(D)Rhizobium
SOLUTION:
d
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Q-51-40378031
Potometer works on the principle of
(A)Amountofwaterabsorbedequalstheamount
transpired
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(B)Osmoticpressure
(C)Rootpressure
(D)Potentialdifferencebetweenthetipofthetubeand
thatoftheplant
CORRECTANSWER:A
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Q-52-13842975
Which one of the following is a free-living obligate anaerobic
bacterium?
(A)Clostridium
(B)Rhodospirillum
(C)Azotobacter
(D)Bacillussubtilis
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CORRECTANSWER:A
SOLUTION:
Clostridiumisafree-livingobligateanaerobicbacteria.
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Q-53-40378044
Nitrogen fixation in root nodules of Alnus is brought about by
(A)Frankia
(B)Azorhizobium
(C)Bradyrhizobium
(D)Clostridium
CORRECTANSWER:A
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Q-54-10761448
Thiobacillus is group of bacteria helpful in carrying out:
(A)Denitrification
(B)Nitrogenfixation
(C)Chemoautotrophicfixation
(D)Nitrification
CORRECTANSWER:A
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Q-55-17820230
which statement is incorrect for ion-channels
(A)Theyareproteins
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(B)Movementthroughthemissimplediffusion
(C)Movementthroughthemisfromhightolow
concentration
(D)Allionspassthroughthesametypeofchannel
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Q-56-17820363
The association between ants and members of family rubiaceae is
(A)Ornithophily
(B)Entomophily
(C)Myrmecophily
(D)Anemophily
CORRECTANSWER:C
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SOLUTION:
Theantsobtainfoodandshelterformtheplantandthey
protecttheplantfromtheplantandtheyprotecttheplant
fromotheranimals
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Q-57-17820272
Plants which are unable to manufacture their food wholly or
partially are
(A)Autophytes
(B)Heterophytes
(C)Halophytes
(D)Holophytes
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Q-58-13842965
Decomposition of organic nitrogen of dead plants and animals into
ammonia is called.______
(A)nitrification
(B)nitratereduction
(C) fixation
(D)ammonification
CORRECTANSWER:D
SOLUTION:
Decompositionoforganicnitrogenofdeadplantsand
animalsintoammoniaiscalledammonificationsomeof
thisammoniaproducedvolatilisesandre-entersthe
atmospherebutmostofitisconvertedintonitratebysoil
N2
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bacteria.
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Q-59-17820223
Active transport from outside to inside of molecules across a
membrane requires
(A)CyclicAMP
(B)Acetylchlorine
(C)ATP
(D)Phloroglucinol
CORRECTANSWER:C
SOLUTION:
TheuseofenergyofATPintransferringsolutesacross
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membranemaybethroughanATPasewhichcreatesa
pHgradientacrossthemembrane.
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Q-60-13843060
Assertion: Reductive amination involves the transfer of amino
group from one amino acid to the keto group of a keto acid.
Reason: In reductive amination, transfer of from glutamic
acid takes place.
(A)Ifbothassertioandreasonaretrueandreasonisthe
correctexplanationofassertion
(B)ifbothassertionandreasonaretruebutreasonis
notthecorrectexplanationofassertion
(C)ifassertionistruebutreasonisfalse
(D)ifbothassertionandreasonarefalse
NH2
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CORRECTANSWER:D
SOLUTION:
Inreductiveaminationinthepresenceofenzyme
glutamatedehydrogenaseandareducedcoenzyme
(NADHorNADPH),ammoniacandirectelycombinewith
-ketoglutaricacidtofromaanaminoacid.Ontheother
hand,transaminationistransferofaminogroup
ofoneaminoacidwiththeketogroup(gt
C=O)ofketoacid.intransaminase,transferof
fromglutamicacidtakesplace.Theenzymerequiredis
transaminaseoraminostransferase.
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α
( − NH2)
NH2
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