download doubtnut now · 2020. 1. 7. · neet revision series reproduction in organisms revise most...
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NEETREVISIONSERIES
REPRODUCTIONINORGANISMS
ReviseMostImportantQuestionstoCrackNEET2020
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Q-1-34100702
Which one of the following statements is not correct?
(A)Offspringproducedbytheasexualreproductionare
calledclone
(B)Microscopic,motileasexualreproductivestructures
arecalledzoospores
(C)Inpotato,bananaandginger,theplantletsarisefrom
theinternodespresentinthemodifiedstem
(D)Waterhyacinth,growinginthestandingwater,drains
oxygenfromwaterthatleadstothedeathoffishes
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CORRECTANSWER:C
SOLUTION:
Statement(c)isincorrectasinpotato,bananaand
gingernewplantletsalwaysarisefromthenodesofthe
modifiestem.Internodesaretheareabetweenthetwo
nodes.
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Q-2-34100706
Match Column-I with Column-II and select the correct option using
the codes given below
Column-I Column-II(A) Pistilsfusedtogether (i) Gametogenesis
(B) Formationofgametes (ii) Pistillate
(C) HyphaeofhigherAscomycetes (iii) Syncarpous
(D) Unisexualfemaleflower (iv) Dikaryotic
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(A)
(B)
(C)
(D)
CORRECTANSWER:D
SOLUTION:
(a)Pistilsfusedtogether-Syncarpous
(b)Formationofgametes-Gametogenesis
(c)Hyphaeofhigherascomycetes-Dikaryotic
(d)Unisexualfemaleflower-Pistillate
ConceptEnhancerAlwaysremember,inBiologythe
latinword"Syn'signifiestogethernessorfusion.
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A B C D
4 3 2 1
A B C D
2 1 4 3
A B C D
1 2 4 3
A B C D
3 1 4 2
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Q-3-34100710
Product of sexual reproduction generally generates
(A)longerviabilityofseeds
(B)prolongeddormancy
(C)newgeneticcombinationleadingtovariation
(D)largebiomass
CORRECTANSWER:C
SOLUTION:
Sexualreproductionleadstonewgeneticcombination
leadingtovariationinnewproducts.Longerviabilityof
seeds,prolongeddormancyandlargebiomassarenot
relatedtosexualreproduction.
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Q-4-34100717
Vegetative propagation in mint occurs by
(A)offset
(B)rhizome
(C)sucker
(D)runner
CORRECTANSWER:C
SOLUTION:
Vegetativepropagationinmintoccursbysucker.These
developfromthenodesofundergroundstemandcomes
upobliquelyabovethegroundintheformofshoots.It
alsotakesplaceinChyrsanthemum.
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Q-5-34100722
Why is vivipary an undesirable character for annual crop plants ?
(A)Itreducesthevigouroftheplant
(B)Itadverselyaffectsthefertilityoftheplant
(C)Theseedsexhibitlongdormancy
(D)Theseedscannotbestoredundernormalconditions
forthenextseason
CORRECTANSWER:D
SOLUTION:
Viviparyistheconditionwhenseedsgerminateonthe
plant.Itisanundesirablecharacterforannulacrop
plantsbecausegerminatedseedscannotbestored
undernormalconditionsforthenextseason.
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Q-6-34100725
During regeneration modification of an organ to other organ is
known as
(A)morophogenesis
(B)epimorhosis
(C)morphallaxis
(D)acretopmaruygrowth
CORRECTANSWER:B
SOLUTION:
Epimorphosisisthereplacementofalostorganofthe
bodybyproliferatingnewcellsfromthesurfaceofthe
woundorinjuredpart.
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Morphogenesis(Gr.Morphe=formandgenesis=origin)is
thegrowth,shapingandarrangementofbodyparts
accordingtogeneticallypredefinedpatterns.Theextent
directionandrateofmorphogenesisdependongenetic
controlsandenvironmentalfactors.
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Q-7-34100732
New Banana plants develop from
(A)rhizome
(B)sucker
(C)stolon
(D)seed
CORRECTANSWER:B
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SOLUTION:
Newbananaplantsdevelopthroughsucker,Suckeris
thesub-aerialmodificationofstemwhichorgiginates
fromthebasalandundergroundportionofmainsteam.
Itgrowsobliquelyupwardsgivingrisetoleafyshootora
newplant.Italsooccursinmint.Chrysanthemum,etc.
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Q-8-34100728
A population of genetically identical individuals, obtained from
asexual reproduction is
(A)callus
(B)clone
(C)deme
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(D)aggregate
CORRECTANSWER:B
SOLUTION:
Clonereferstothepopulationofgeneticallyidentical
individualsobtainedfromasesualreproductionor
producedvegetativelyfromsingleorganism.An
individualmemberofacloneiscalledramete.
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Q-9-34100730
Vegetative reproduction of Agave occurs through
(A)rhizome
(B)stolon
(C)bulbils
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(D)sucker
CORRECTANSWER:C
SOLUTION:
VegetativepropagationofAgaveoccursbybilbils.These
arecondensedaxillarybudcapableofgivingriseto
shoots,i.e.independentplant.
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Q-10-34100719
In which one pair, both the plants can be vegetatively propagated by
leaf pieces ?
(A)AgaveandKalanchoe
(B)BryophyllumandKalanchoe
(C)AsparagusandBryophyllum
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(D)ChrysanthemumandAgave
CORRECTANSWER:B
SOLUTION:
MarginalnotchesinKalanchoeandBryophyllum
possessadventitiousbudsintheirleavesforvegetative
propagation.
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Q-11-34100713
The 'eyes' of the potato tuber represent
(A)flowerbuds
(B)shootbuds
(C)axillarybuds
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(D)rootbuds
CORRECTANSWER:C
SOLUTION:
Tuberisovalorspericalswollenundergroundmodified
stemlackingadventitiousroots.Itpossessesanumber
ofspirallyarrangeddepressioncalledeyes.Eacheye
representsnodeandconsistsof1-3axillarybudsinthe
axilsofsmallscallyleaves.
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Q-12-34100723
In oogamy. Fertilization involves
(A)asmallnon-motilefemalegameteandalargemotile
malegamete
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(B)alargenon-motilefemalegameteandasmallmotile
malegamate
(C)alargenon-motilefemalegameteandasmallnon-
motilemalegamate
(D)alargemotilefemalegameteandasmallnon-motile
gamete
CORRECTANSWER:B
SOLUTION:
Inoogamouistypeofsexualreproduction,thefemale
gamete(ovum/egg)isbig.Passivewhilemalegametes
(spermatozoids)aresmaller,activeandmotile.
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Q-13-34100726
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The process of series of changes from larva to adult after embryonic
development is called
(A)regeneration
(B)metamorphosis
(C)growth
(D)ageing
CORRECTANSWER:B
SOLUTION:
Metamorphosis(meta=change,morphe=form)isa
processbywhichananimalundergoesacomparatively
rapidchangefromlarvaltoadultform.Regenerationis
regrowthofthepartofbodywhichhasbeenremoved
duetotheinujuryorothercauses.Growthisanincrease
indrymassofanorganism.Ageingispropressive
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deteriorationinactivityofcell,tissues,organs,etc.
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Q-14-36805965
Offesets are produced by
(A)parthenocarpy
(B)mitoticdivisons
(C)meioticdivisons
(D)parthenogenesis
CORRECTANSWER:B
SOLUTION:
Offsetsareproducedbymitoticdivisions.
Theyareoneinternodelongrunnersthatoccurinsome
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aquaticplants.Breakingofoffsetshelpsinvegetative
propagation.Theygiverisetonewplants,e.g.
Eichhornia.Meloticdivisionsoccurinonlygermcells.
Parthenocarpyisthedevelopmentofseedlessfruits.
Parthenogenesiscanbedefinedasthedevelopmentof
aneggintoacompleteindividualwithoutfertilisation.
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Q-15-36806018
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Sweet potato is a modified
(A)taproot
(B)adventitiousroot
(C)stem
(D)rhizome
SOLUTION:
Sweetpotatoisamodifiedadventitiousrootwhichis
meantforstorageoffood.Itdoesnotassumeadefinite
shapeandoccurssingly.
Taprootsdevelopfromtheradicleoftheemb1yo.They
graduallybecomenarrowtowardsthetip.Stemis
usuallytheabove-grounderectascendingpartofthe
plantbody.Itbearsleavesandflowers.Rhizomeis
modifiedundergroundstem,e.g.,Zingiberofficinale.
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Q-16-55656323
Which of the following flowers only once in its life-time
(A)Papaya
(B)Mango
(C)Jackfruit
(D)Bamboospecies
CORRECTANSWER:D
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Q-17-55656319
Which one of the following is wrong about Chara
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(A)Gobuleismalereproductivestructure
(B)Upperoogoniumandlowerroundantheridium
(C)Globuleandnuculepresentonthesameplant
(D)Upperantheridiumandloweroogonium
CORRECTANSWER:D
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Q-18-55656316
Why asexual reproduction is sometimes disadvantageous ?
(A)Itallowsanimalsthatdonotmovearoundtoproduce
offspringwithoutfindingmate
(B)itallowsananimalstoproducemanyoffspring
quickly
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(C)itsavethetimeandenergyofgameteproduction
(D)itproducegeneticallyuniformpopulations
CORRECTANSWER:D
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Q-19-55656311
Dentrification is carried out by
(A)Pseudomonas
(B)Nitrobacter
(C)Nitrosomonas
(D)Nitrococcus
CORRECTANSWER:A
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Q-20-55656293
Which of the following is pollinate by water
(A)Viola
(B)Yucca
(C)Oxalis
(D)Commelina
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Q-21-55656295
The term parthenogenesis was coined by
(A)Owen
(B)Bovri
(C)Balfour
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(D)Grobber
CORRECTANSWER:A
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Q-22-55656288
Which one of the following processes results in the formation of
clone of bacteria ?
(A)Binaryfission
(B)Conjugation
(C)Transformation
(D)Transduction
CORRECTANSWER:A
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Q-23-55656285
Which one of the following animals posesses high regeneation
capacity?
(A)Planaria
(B)Taenia
(C)Salpa
(D)Periplaneta
CORRECTANSWER:A
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Q-24-55656271
Which of the following animals is having longitudinal binary
fission
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(A)Euglena
(B)Plasmodium
(C)Planaria
(D)Paramecium
CORRECTANSWER:A
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Q-25-55656314
The endosperm cells in angiosperms are
(A)hapolid
(B)diploid
(C)triploid
(D)tetraploid
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CORRECTANSWER:C
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Q-26-55656310
Both, autogamy and geitonogamy are prevented in
(A)Papaya
(B)cucumber
(C)castor
(D)maize
CORRECTANSWER:A
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Q-27-55656291
Vegetative propagation in Pistia occurs by
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(A)stolon
(B)offset
(C)runner
(D)sucker
CORRECTANSWER:B
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Q-28-55656280
Exponential growth occur in
(A)yeast
(B)asexualreproduction
(C)bacteria
(D)allofthese
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CORRECTANSWER:B
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Q-29-55656270
In which of the following organisms, self fertilization is seen ?
(A)Fish
(B)Roundworm
(C)Earthworm
(D)Tapeworm
CORRECTANSWER:D
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Q-30-55656266
A scion is grafted to a stock. The quality of fruits produced wiIl be
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determined by the genotype of -
(A)stock
(B)scion
(C)bothstockandscion
(D)neitherstocknorscion
CORRECTANSWER:B
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Q-31-55656263
Ramet is
(A)clone
(B)callus
(C)cellaggregate
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(D)individualmemberofclone
CORRECTANSWER:D
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Q-32-55656261
Grafting in sugarcane can not be performed because
(A)vascularbundlesarescattered
(B)pholemisinternaltoxylem
(C)sugarcaneplantisdelicate
(D)itisunabletobearinjury
CORRECTANSWER:A
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Q-33-55656255
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Menstrual cycle occurs in
(A)oldworldmonkeys
(B)apes
(C)humans
(D)allofthese
CORRECTANSWER:D
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Q-34-55656268
Maximum life span of Eagle is
(A)90years
(B)15years
(C)10years
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(D)5years
CORRECTANSWER:A
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Q-35-55656309
Ovule integument gets transformed into
(A)seed
(B)fruitwall
(C)seedcoat
(D)cotyledons
CORRECTANSWER:C
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Q-36-55656265
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Which of the following groups of plants are propagated through
underground root
(A)BryphyllumandKalanchoe
(B)Pistia,ChrysanthemumandPineapple
(C)Ginger,Potato,Onion,Zamikand
(D)SweePotato,Asparagus,TapiocaandDahlia
CORRECTANSWER:D
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Q-37-55656262
In a grafted plant, stock has 48 chromosomes while scion has 24
chromosomes. The chromosome number for root cells and eggs are
(A)48and24
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(B)24and24
(C)24and12
(D)48and12
CORRECTANSWER:D
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Q-38-55656253
Plasmotomy occurs in
(A)Hydra
(B)Obelia
(C)Opalina
(D)Plasmodium
CORRECTANSWER:C
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Q-39-55656250
The terminal irreversiable stage of ageing is called
(A)autogamy
(B)syngamy
(C)senescence
(D)cytogames
CORRECTANSWER:C
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Q-40-55656248
Mango and Guava are propagated through
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(A)tissueculture
(B)grafting
(C)stemcuttings
(D)layering
CORRECTANSWER:B
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Q-41-55656260
Induction of rooting on stems before separating them from parent
plant is
(A)grafting
(B)layering
(C)root-stemjoint
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(D)cutting
CORRECTANSWER:B
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Q-42-55656254
Gemmule formation occurs in
(A)freshwatersponge
(B)somemarinespomges
(C)Labeorohita
(D)Both(1)and(2)
CORRECTANSWER:D
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Q-43-55656246
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Natural parthenogenesis is found in
(A)aphids
(B)honeybees
(C)wasps
(D)alltheabove
CORRECTANSWER:D
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Q-44-55656258
In grafting stock and scion ought to be joined
(A)Phaloemtopheloem
(B)xylemtoxylem
(C)pithtopith
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(D)cambiumtocambium
CORRECTANSWER:D
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Q-45-55656240
Vegetative propagation plays a vital role in
(A)sericulture
(B)apiculture
(C)sylviculture
(D)horticulture
CORRECTANSWER:D
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