Download pdf - Download Doubtnut Now · 2020. 1. 7. · NEET REVISION SERIES REPRODUCTION IN ORGANISMS Revise Most Important Questions to Crack NEET 2020 Download Doubtnut Now Q-1 - 34100702 Which

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.

WatchVideoSolutionOnDoubtnutApp

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.


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.


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.


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.


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.


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.


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.


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

https://doubtnut.app.link/U2TxkLvIW2

deteriorationinactivityofcell,tissues,organs,etc.


Q-14-36805965

Offesets are produced by

(A)parthenocarpy

(B)mitoticdivisons

(C)meioticdivisons

(D)parthenogenesis

CORRECTANSWER:B

SOLUTION:

Offsetsareproducedbymitoticdivisions.

Theyareoneinternodelongrunnersthatoccurinsome

https://doubtnut.app.link/U2TxkLvIW2https://doubtnut.app.link/cjaa0MvIW2

aquaticplants.Breakingofoffsetshelpsinvegetative

propagation.Theygiverisetonewplants,e.g.

Eichhornia.Meloticdivisionsoccurinonlygermcells.

Parthenocarpyisthedevelopmentofseedlessfruits.

Parthenogenesiscanbedefinedasthedevelopmentof

aneggintoacompleteindividualwithoutfertilisation.


Q-15-36806018

https://doubtnut.app.link/cjaa0MvIW2https://doubtnut.app.link/TY16vOvIW2

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


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


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


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


Q-21-55656295

The term parthenogenesis was coined by

(A)Owen

(B)Bovri

(C)Balfour

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(D)Grobber

CORRECTANSWER:A


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


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


Q-25-55656314

The endosperm cells in angiosperms are

(A)hapolid

(B)diploid

(C)triploid

(D)tetraploid

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CORRECTANSWER:C


Q-26-55656310

Both, autogamy and geitonogamy are prevented in

(A)Papaya

(B)cucumber

(C)castor

(D)maize

CORRECTANSWER:A


Q-27-55656291

Vegetative propagation in Pistia occurs by

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(A)stolon

(B)offset

(C)runner

(D)sucker

CORRECTANSWER:B


Q-28-55656280

Exponential growth occur in

(A)yeast

(B)asexualreproduction

(C)bacteria

(D)allofthese

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CORRECTANSWER:B


Q-29-55656270

In which of the following organisms, self fertilization is seen ?

(A)Fish

(B)Roundworm

(C)Earthworm

(D)Tapeworm

CORRECTANSWER:D


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


Q-31-55656263

Ramet is

(A)clone

(B)callus

(C)cellaggregate

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(D)individualmemberofclone

CORRECTANSWER:D


Q-32-55656261

Grafting in sugarcane can not be performed because

(A)vascularbundlesarescattered

(B)pholemisinternaltoxylem

(C)sugarcaneplantisdelicate

(D)itisunabletobearinjury

CORRECTANSWER:A


Q-33-55656255

https://doubtnut.app.link/Ovd6upwIW2https://doubtnut.app.link/C759ZqwIW2https://doubtnut.app.link/9m1cBswIW2

Menstrual cycle occurs in

(A)oldworldmonkeys

(B)apes

(C)humans

(D)allofthese

CORRECTANSWER:D


Q-34-55656268

Maximum life span of Eagle is

(A)90years

(B)15years

(C)10years

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(D)5years

CORRECTANSWER:A


Q-35-55656309

Ovule integument gets transformed into

(A)seed

(B)fruitwall

(C)seedcoat

(D)cotyledons

CORRECTANSWER:C


Q-36-55656265

https://doubtnut.app.link/H8IflvwIW2https://doubtnut.app.link/Xtm5NwwIW2https://doubtnut.app.link/IU0KqzwIW2

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


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


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


Q-40-55656248

Mango and Guava are propagated through

https://doubtnut.app.link/49hZ5DwIW2https://doubtnut.app.link/liWWGGwIW2https://doubtnut.app.link/hIxIfIwIW2

(A)tissueculture

(B)grafting

(C)stemcuttings

(D)layering

CORRECTANSWER:B


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


Q-42-55656254

Gemmule formation occurs in

(A)freshwatersponge

(B)somemarinespomges

(C)Labeorohita

(D)Both(1)and(2)

CORRECTANSWER:D


Q-43-55656246

https://doubtnut.app.link/vu6gtQWIW2https://doubtnut.app.link/Si5c1RWIW2https://doubtnut.app.link/rjNeFUWIW2

Natural parthenogenesis is found in

(A)aphids

(B)honeybees

(C)wasps

(D)alltheabove

CORRECTANSWER:D


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


Q-45-55656240

Vegetative propagation plays a vital role in

(A)sericulture

(B)apiculture

(C)sylviculture

(D)horticulture

CORRECTANSWER:D


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