Chapter Name DPP Page No. DPP – 1 2-3 Development DPP –

Q8.Q9.Q10.Q11.auxins.(B) IAA and NAA are natural butIBA, 2, 4, 5-T and 2, 4-D areSynthetic auxins.(C) NAA and 2, 4, 5-T are natural butIAA, IBA and 2, 4-D are syntheticauxins.(D) IAA, NAA, IAB, 2, 4-D and 2, 4, 5-Tare synthetic auxins.All of the following statements arecorrect regarding ethylene except (A) It delayes senescence.(B) It decreases the respiration rateduring fruit ripening.(C) It breaks seed and bud dormancy.(D) It inhibits flowering in mango.Choose the incorrect statement(A) Long day plants flower if the nightlength is shorter than a criticalperiod.(B) Short-day plants flower whennight length exceeds a criticaldark period.(C) Day-neutral plants are insensitiveto day length.(D) The process of flowering does notoccur in dayneutral plants.Find out the correct statement regardingvernalisation .(A) Vernalisation refers to thepromotion of flowering by aperiod of low temperature.(B) The spring variety of crops arenormally planted in the springand come to flower before theend of the growing season.(C) It is not seen in biennial plants.(D) Subjecting cold treatment tosugar beet will result inflowering.Phytochrome is found in (A) Algae(B) FungiQ12.Q13.Q14.Q15.(C) Gymnosperms(D) AngiospermsIn short day plants (SDP) flowering isinduced by(A) Long night(B) Photoperiod less than 12 hours(C) Photoperiod shorter than criticalvalue and uniterrupted longnight.(D) Short photoperiod andinterrupted long night.Which one shows red far redinterconversions?(A) Carotenoids(B) Cytochromes(C) Chlorophyll(D) PhytochromeA long day plant is (A) Xanthium(B) Chrysanthemum(C) Radish(D) TomatoLow temperature is harmful forplants, because it has(A) Desiccation effect(B) Chilling effect(C) Freezing effect(D) All of theseDirection 16 to 20 True / FalseQ16.Q17.Q18.Q19.Q20.Gibberellic acid is used for ripeningof fruits.Cytokinins are commercially used toincrease shelf life of vegetables.ABA is derived from carotenoids.Ethylene can induce dormancy inseeds.Gibberellin is used as a substitute ofvernalisation.BIOLOGY DPP #5Plant Growth & DevelopmentGrowth Differentiation DedifferentiationRedifferentiationpollen tube is measured.Direction 1 to 15 Objective TypeQ1.Find out the correct and incorrectstatements from the following andchoose the correct option.(i) 17,500 new cells are produced perhour by a single maize root apicalmeristem.(ii) With the help of length, growth of(iii) The growth of the leaf ismeasured in terms of volume.(iv) Cells in a watermelon mayincrease in size by upto 3,50,000times.(A) (i), (ii), (iii) are correct and (iv) isincorrect.(B) (i), (ii), (iv) are correct and (iii) is 6

Q2.Q3.Q4.Q5.incorrect.(C) (ii), (iii) are correct and (i), (iv) areincorrect.(D) (i), (iv) are correct and (ii), (iii) areincorrect.Find out the correct statements onphytohormones & their action.(i) Cytokinins specially help indelaying senescence.(ii) Auxins are involved in regulatingapical dominance.(iii) Ethylene is specially useful inenhancing seed germination.(iv) Gibberellins are responsible forimmature falling of leaves.(A) (i) and (iii) only(B) (i) and (iv) only(C) (i) and (ii) only(D) (ii) and (iii) onlyFind out the correct statements ?(i) Cytokinins promote senescence.(ii) Auxins control apical dominance.(iii) Gibberellins promote shootelongation.(iv) Abscissic acid enables seeds towithstand desiccation.(A) (i) and (ii) only(B) (ii) and (iii) only(C) (i) and (iii) only(D) (ii), (iii) and (iv) onlyRead the following statements (i-iv)regarding “ethephon” and answerhow many of them are correct(i) Ethephon is sprayed in aqueoussolution and is readily absorbedand transported within the plant.(ii) It hastens fruit ripening intomatoes and apples.(iii) It can be used to induce fruitthinning in cotton, cherry andwalnut.(iv) It is used to promote female sexexpression in cucumber andincrease yield.(A) One(B) Two(C) Three(D) AllAbsolute growth rate refers to(A) synthesis of new intercellular andextracellular materials.(B) measurement & the comparisonof total growth per unit time(C) growth of the given system perunit time.(D) increased growth per unit time.Q6.Q7.Q8.Q9.Q10.Q11.Q12.The exponential growth can beexpressed as W1 W0ert.The ‘r’ in theexpression is (A) Relative growth rate and dependson final size.(B) Absolute growth rate & dependson initial size.(C) Relative growth and also referredto as efficiency index.(D) None of the aboveA primary root grows from 5 cm to 26cm in a week. Calculate the relativegrowth rate over the period.(A) 20%(B) 40%(C) 60%(D) 80%De-differentiation is(A) regaining the lost capacity ofdivision by living cells.(B) the ability of plant to producedifferent structures in responseto environment.(C) the extrinsic factor affecting plantgrowth.(D) all of the above.The hormone that is used to inducerooting from cut end of the stem is (A) Kinetin(B) Indole butyric acid(C) GA3(D) Abscisic acidPlant hormone which is translocatedto other parts for growth of the plantis(A) indole-3-acetic acid(B) gibberellins(C) cytokinins(D) none of theseFruit drop is caused by (A) Less auxin in fruit than in stem(B) More auxin in fruit than in stem(C) Equal distribution of auxin instem and fruit(D) Absence of auxin in stem andfruitPlants bend toward the light because(A) They need light forphotosynthesis(B) They need light for respiration(C) Light attracts them(D) Cells on the shaded side elongatemore 7

Q13.Q14.Q15.Q1.Q2.Q3.Q4.Q5.Which one of the following hormoneis concerned chiefly with rootinitiation?(A) IBA(B) GA3(C) ABA(D) KinetinIf the tip of a seedling is cut offgrowth as well as bending ceasesbecause it hampers(A) Respiration(B) Photosynthesis(C) Perception of light stimulus(D) TranspirationIn germinating seeds Amylase,Proteases,Lipases are stimulated by :(A) Auxin(B) Gibberellin(C) Cytokinin(D) EthyleneDirection 16 to 20 True / FalseQ16.Q17.Q18.Q19.Q20.POWER-BOOSTERThe cell derived from meristemsdifferentiate and regain the capacityto divide by a phenomenon called(A) differentiation(B) dedifferentiation(C) redifferentiation(D) totipotency(E) regenerationA few normal seedlings of tomatowere kept in a dark room. After a fewdays they were found to havebecome white-coloured like albinos.Which of the following terms will youuse to describe them?(A) Mutated(B) Embolised(C) Etiolated(D) DefoliatedAuxanometer is used to measure(A) the growth in length of a plantorgan(B) the growth in breadth of a plantorgan(C) population of the pests attackinga plant(D) both (A) and (B).The Avena curvature is used forbioassay of(A) IAA(B) ethylene(C) ABA(D) GA3Auxin can be bioassayed by(A) potometerQ6.Q7.ABA closes stomata in stressfulsituation.Gibberellins inhibits amylaseformation in germinating cerealgrains.In long day plants, the critical darkperiod needs to be exceeded forflowering.Day neutral plants can blossomthroughout the year.Tobacco is a short day plant.(B) lettuce hypocotyl elongation(C) Avena coleoptile curvature(D) hydroponicsAssertion : Plant growth regulators (PGRs) arevery important for plant growth anddevelopment.Reason : Auxins do not induce flowering ingymnosperms.(A) If both assertion and reason aretrue and reason is the correctexplanation of assertion.(B) If both assertion and reason aretrue but reason is not the correctexplanation of assertion.(C) If assertion is true but reason isfalse.(D) If both assertion and reason arefalse.Dr. F. Went noted that if coleoptiletips were removed and placed onagar for one hour, the agar wouldproduce a bending when placed onone side of freshly-cut coleoptilestumps. Of what significance is thisexperiment?(A) It made possible the isolation andexact identification of auxin.(B) It is the basis for quantitativedetermination of small amount ofgrowth-promoting substances.(C) It supports the hypothesis thatIAA is auxin.(D) It demonstrated polar movementof auxins. 8

Q8.Q9.Q10.Q11.The pineapple which under natural conditionis difficult to blossom has been made toproduce fruits throughout the year byapplication of(A) NAA, 2, 4-D(B) phenyl acetic acid(C) cytokinin(D) IAA, IBAOne of the commonly used plantgrowth hormone in tea plantation is(A) ethylene(B) abscisic acid(C) zeatin(D) indole - 3-acetic acidCompare the statements A and BStatement A : Auxins promote apicaldominance by suppressing the activity oflateral buds.Statement B : In horiculture, periodic pruningof shoot tips is done to make mulberry plantsbushy.Select the correct description(A) statement A is wrong and B iscorrect(B) both the statements A and B arecorrect and A is not the reasonfor B(C) both the statements A and B arecorrect and A is the reason for B.(D) statement A is correct and B iswrong.Match Column - I with Column - IIand select the correct option fromthe codes given below.Column - IColumn - IIA.C. Darwinand F.DarwiniCytokininB.Miller (A) A-(iv), B-(i), c-(iii), D-(v)(B) A-(iv), B-(i), C-(ii), D-(iii)(C) A-(iii), B-(i), C-(ii), D-(iv)(D) A-(v), B-(iv), C-(ii), D-(i)Q12.Match Column - I with Column - IIand select the correct option fromthe codes given below.Column - IQ13.Column - nedisease ofriceiiiIAAD.NaturalcytokininivGAvKinetin(A) A-(iii), B-(i), C-(iv), D-(ii)(B) A-(i), B-(iii), C-(iv), D-(v)(C) A-(iii), B-(i), C-(iv), D-(v)(D) A-(iv), B-(i), C-(v), D-(ii)Match Column - I with Column - IIand select the correct option fromthe codes given below.Column – IA.AuxinsColumn - IIi.Breaking seeddormancyB.Gibberellinsii.Inducing fruitrepeningC.Cytokininsiii.Formation roplastdevelopmentin leaves(A) A-(iv), B-(i), C-(v), D-(ii)(B) A-(iv), B-(v), C-(iii), D-(ii)(C) A-(i), B-(iii), C-(ii), D-(iv) 9

Q14.(D) A-(iii), B-(iv), C-(i), D-(v)Match Column - I with Column - IIand select the correct option fromthe codes given below.Column - IA.IAAColumn – llinsii.Shoot apicesC.Ethyleneiii.Root tropismC.Abscisicacidiii.Antagonist toGAsD.Ethyleneiv.Growth oflateral ticauxinC.IBAiii.CytokininD.NAAiv.Natural auxin(A) A-iii, B-iv, C-i, D-ii(B) A-ii, B-i, C-iv, D-iii(C) A-i, B-ii, C-iii, D-iv(D) A-iv, B-i, C-ii, D-iii(E) A-iii, B-i, C-iv, D-iiMatch column I and column II andselect the correct optionColumn - IColumn - IIA.Auxini.Herringsperm DNADNAABAZeatinColumn – IIhormoneHerringspermB.Ripening offruits(A) A-(iv), B-(iii), C-(v), D-(ii), E-(i)(B) A-(v), B-(iii), C-(iv), D-(ii), E-(i)(C) A-(iv), B-(i), C-(iv), D-(iii), E-(ii)(D) A-(v), B-(iii), C-(ii), D-(i), E-(iv)Match the following and choose thecorrect combinationA.(A) A-(iv), B-(ii), C-(iii), D-(i)(B) A-(ii), B-(iv), C-(iii), D-(i)(C) A-(ii), B-(iii), C-(iv), D-(i)(D) A-(iii), B-(iv), C-(ii), D-(i)Match the following:Column - IColumn - IIA.vColumn - I(A) A-(ii), B-(iii), C-(i)(B) A-(iii), B-(ii), C-(i)(C) A-(i), B-(ii), C-(iii)(D) A-(ii), B-(i), C-(iii)Match Column - I with Column - IIand select the correct option fromthe codes given below.Column - IColumn - IIA.CytokininsQ19.B.Cytokininii.Inhibitor A) A-iii, B-i, C-v, D-iv, E-ii(B) A-iv, B-v, C-i, D-iii, E-ii(C) A-ii, B-i, C-v, D-iii, E-iv(D) A-iii, B-i, C-v, D-ii, E-iv(E) A-iv, B-i, C-v, D-iii, E-iiMatch the items in Column I withColumn II and choose the correctOption 10

Column - IColumn - uxinC.Herringfish DNAiii.EthyleneD.Ripeningfruitsiv.Abscisic acidE.Agedleaves ofplantsvGibberellinsQ20.(A) A-ii, B-v, C-i, D-iii, E-iv(B) A-ii, B-iii, C-iv, D-v, E-i(C) A-i, B-v, C-ii, D-iv, E-iii(D) A-v, B-iv, C-iii, D-ii, E-i(E) A-iii, B-ii, C-i, D-v, E-ivWhich one of the following pairs isincorrectly matched(A) Adenine derivative– Kinetin(B) Carotenoid derivative – ABA(C) Terpenes– IAA(D) Indole compounds– IBA(E) Gas– EthyleneBIOLOGY Previous Year Questions (PYQ)Q1.Q2.Q3.Q4.Differentiation of shoot is controlledby : [CBSE AIPMT 2003](A) High gibberellin : cytokinin ratio(B) High auxin : cytokinin ratio(C) High cytokinin : auxin ratio(D) High gibberellin : auxin ratioOne set of a plant was grown at 12 hoursday and 12 hours night period cycles and itflowered while in the other set nightphase was interrupted by flash of lightand it did not produce flower. Underwhich one of the following categories willyou place this plant?[CBSE AIPMT 2004](A) Long day(B) Darkness neutral(C) Day neutral(D) Short dayAnthesis is a phenomenon whichrefers to [CBSE AIPMT 2004](A) Reception of pollen by stigma(B) Formation of pollen(C) Development of anther(D) Opening of flower budCell elongation in internodal regionsof the green plants takes place dueto[CBSE AIPMT 2004](A) Indole acetic acid(B) Cytokinins(C) Gibberellins(D) EthyleneQ5.Q6.Q7.Q8.Q9.Treatment of seed at low temperatureunder moist conditions to break itsdormancy is called [CBSE AIPMT 2006](A) Vernalisation(B) Chelation(C) Stratification(D) ScarificationAn enzyme that can stimulategermination of barley seeds is[CBSE AIPMT 2006](A) Lipase(B) Protease(C) Invertase(D) a- amylaseHow does pruning help in making thehedge dense? [CBSE AIPMT 2006](A) It frees axillary buds from apicaldominance(B) The apical shoot grows fasterafter pruning(C) It released wound hormones(D) It induces the differentiation ofnew shoots from the rootstockWhich one of the following pairs, isnot correctly matched?(A) Abscissic Acid – Stomatalclosure(B) Gibberellic Acid – Leaf fall(C) Cytokinin – Cell division(D) IAA – Cell wall elongation‘Foolish Seedling’ disease of rice ledto the discovery of: 11

Q10.Q11.Q12.Q13.Q14.Q15.Q16.(A) GA(B) ABA(C) 2, 4 D(D) IAAThe wavelength of light absorbed byPr form of phytochrome is:[CBSE AIPMT 2007](A) 640 nm(B) 680 nm(C) 720 nm(D) 620 nmOpening of floral buds into flowers, istype of:[CBSE AIPMT 2007](A) Autonomic movement oflocomotion(B) Autonomic movement of variation(C) Paratonic movement of growth.(D) Autonomic movement of growthImportance of day length in floweringof plants was first shown in:[CBSE AIPMT 2008](A) Lemna(B) Tobacco(C) Cotton(D) PetuniaSenescence as an active developmentalcellular process in the growth andfunctioning of a flowering plant, isindicated in:[CBSE AIPMT2008](A) Vessels and tracheiddifferentiation(B) Leaf abscission(C) Annual plants(D) Floral partsWhich one of the following acids is aderivative of carotenoids?[CBSE AIPMT 2009](A) Indole butyric acid(B) Indole-3-acetic acid(C) Gibberellic acid(D) Abscisic acidOne of the synthetic auxin is:[CBSE AIPMT 2009](A) NAA(B) IAA(C) GA(D) IBACoiling of garden pea tendrils aroundany support is an example of?(A) Thigmotaxis(B) Thigmonasty(C) ThigmotropismQ17.Q18.Q19.Q20.Q21.Q22.(D) ThermotaxisPhototropic curvature is the resultof uneven distribution of?[CBSE AIPMT 2009](A) Gibberellin(B) Phytochrome(C) Cytokinins(D) AuxinDuring seed germination its storedfood is mobilized by:[NEET 2013](A) Ethylene(B) Cytokinin(C) ABA(D) GibberellinA few normal seedlings of tomato werekept in a dark room. After a few daysthey were found to have become whitecoloured like albinos. Which of thefollowing terms will you use to describethem?[CBSE AIPMT2014](A) Mutated(B) Embolised(C) Etiolated(D) DefoliatedWhich one of the following growthregulators is known as ‘stress hormone?[CBSE AIPMT 2014,1993](A) Abscisic acid(B) Ethylene(C) GA3(D) Indole acetic acidDr. F. Went noted that if coleoptiletips were removed and placed onagar for one hour, the agar wouldproduce a bending when placed onone side of freshly cut coleoptilestumps. Of what significance is thisexperiment?[CBSE AIPMT 2014](A) It made possible the isolation andexact identification of auxin(B) It is the basis for quantitativedetermination of small amountsof growth-promoting substances(C) It supports the hypothesis thatIAA is auxin(D) It demonstrated polar movementof auxinsAuxin can be bioassayed by:[CBSE AIPMT 2015](A) Avena coleoptile curvature(B) Hydroponics 12

Q23.Q24.Q25.Q26.Q27.Q28.(C) Potometer(D) Lettuce hypocotyl elongationYou are given a tissue with its potentialfor differentiation in an artificial culture.Which of the following pairs of hormoneswould you add to the medium to secureshoots as well as roots?[NEET 2016](A) IAA and gibberellin(B) Auxin and cytokinin(C) Auxin and abscisic acid(D) Gibberellin and abscisic acidPhytochrome is a[NEET 2016](A) flavoprotein(B) glycoprotein(C) lipoprotein(D) chromoproteinThe avena curvature is used for bioassayof[NEET 2016](A) GA3(B) IAA(C) Ethylene(D) ABAFruit and leaf drop at early stagescan be prevented by the applicationof[NEET 2017](A) Cytokinins(B) Ethylene(C) Auxins(D) Gibberellic acidPhytohormones are[2008](A) hormones regulating growth fromseed to adulthood(B) growth regulators synthesised byplants and influencingphysiological process(C) hormones regulating flowering(D) hormones regulating secondarygrowthRefer the given figures on photoperiodismand select the correct option. [2010](A)No shortlight - lightperiodCorreleationBetweenperiodlong lightexposureexposure periodandflowering(B)long light –exposureperiodperiodnocorrelationbetweenlight periodlight periodshort light –exposureexposureshort lightexposureperiodlong light –(C)(D)nocorrelationbetweenlight periodQ29.Q30.Q31.Q32.exposureperiodshort light exposureperiodfloweringperiodandfloweringno correlationbetween lightperiodand floweringlong light –exposureexposure andAbscisic acid is known as the stresshormone because it[2012](A) sugar but not ATP(B) ATP but not sugar(C) both ATP and sugar(D) neither ATP nor sugar.Which of the following plant growthregulators (PGRs) promotes root initiation,flowering and induced parthenocarpy ?[2013](A) Gibberellin(B) Auxin(C) Cytokinin(D) EthyleneVernalisation is subjected to plantsgrowing in[2014](A) tropical areas(B) sub tropical areas(C) temperate areas(D) hot areas/arctic region.Gibberellins can promote seed germinationbecause of their influence on[2015](A) rate of cell division(B) production of hydrolysingenzymes(C) synthesis of abscisic acid 13

Q33.Q34.(D) absorption of water through hardseed coat.One hormone hastens maturity period injuvenile conifers, a second hormonecontrols xylem differentiation, while thethird hormone increases the tolerance ofplants to various stresses. They arerespectively[2016](A) Gibberellin, Auxin, Ethylene(B) Auxin, Gibberellin, Cytokinin(C) Gibberellin, Auxin, ABA(D) Auxin, Gibberellin, ABA.Cytokinin involves[2018](A) kinetin, zeatin, BAP(B) GA3, IBA KinetinQ35.Q36.(D) IAA, Zeatin, kinetinAuxin was first isolated from[2018](A) Human urine(B) Callus(C) Coconut milk(D) NoneWhich of the following statement iswrong about Abscisic acid:[2018](A) It helps in general plantmetabolism(B) It is antagonistic to GAb(C) It helps in seed maturation &dormancy(D) Morphogenesis(C) Zeatin, GA3, BAP 14

ANSWER KEYDPP TFDPP TFDPP FTDPP FTDPP TTPOWER AABAEAACPREVIOUS YEAR QUESTIONS CCCA 15

Jan 07, 2021 · Plants requiring exposure to light far less than the critical period for flowering are called - (A) long day plants. (B) day neutral plants. (C) intermediate day plants. (D) short day plants. Q11. The cut flowers and vegetables can be kept fresh