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CBSE Class 12 Board Exam 2019 : Biology (Series 4)

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SET-1 H$moS> Z . Series BVM/4 Code No. amob Z . 57/4/1 narjmWu H$moS >H$mo C ma-nwp VH$m Ho$ _wI-n >na Ad ` {bIo & Roll No. Candidates must write the Code on the title page of the answer-book. H $n`m Om M H$a b| {H$ Bg Z-n _o _w{ V n > 15 h & Z-n _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Z ~a H$mo N>m C ma-nwp VH$m Ho$ _wI-n > na {bI| & H $n`m Om M H$a b| {H$ Bg Z-n _| >27 Z h & H $n`m Z H$m C ma {bIZm ew $ H$aZo go nhbo, Z H$m H $_m H$ Ad ` {bI| & Bg Z-n H$mo n T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h & Z-n H$m {dVaU nydm _| 10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>m Ho$db Z-n H$mo n T>|Jo Am a Bg Ad{Y Ho$ Xm amZ do C ma-nwp VH$m na H$moB C ma Zht {bI|Jo & Please check that this question paper contains 15 printed pages. Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. Please check that this question paper contains 27 questions. Please write down the Serial Number of the question before attempting it. 15 minute time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. Ord {dkmZ (g mp VH$) BIOLOGY (Theory) {ZYm [aV g_` : 3 K Q>o A{YH$V_ A H$ : 70 Time allowed : 3 hours 57/4/1 Maximum Marks : 70 1 P.T.O. gm_m ` {ZX}e : Z-n _| Mma I S>m| _ o Hw$b 27 Z {XE JE h & g^r Z A{Zdm` h & (ii) I S> A _| Z g `m 1 go 5 A{V bKw-C mar` Z h , `oH$ Z 1 A H$ H$m h & (iii) I S> ~ _| Z g `m 6 go 12 bKw-C mar` Z H$ma I Ho$ h , `oH$ Z 2 A H$m| H$m h & (iv) I S> g _| Z g `m 13 go 24 bKw-C mar` Z H$ma II Ho$ h , `oH$ Z 3 A H$m| H$m h & (v) I S> X _| Z g `m 25 go 27 XrK -C mar` Z h , `oH$ Z 5 A H$m| H$m h & (vi) Z-n _| g_J na H$moB {dH$ n Zht h , {\$a ^r 1 A H$ dmbo Xmo Zm| _|, 2 A H$m| dmbo Xmo Zm| _|, 3 A H$m| dmbo Mma Zm| _| Am a 5 A H$m| dmbo g^r VrZm| Zm| _| ^rVar M`Z{dH$ n {XE JE h & `oH$ narjmWu H$mo Eogo Zm| Ho$ Xmo {dH$ nm| _ o go H$moB EH$ Z hb H$aZm h & (vii) Amd `H$VmZwgma, {M m| H$m aoIZ gm\$-gwWam Ed `Wmo{MV bo~b hmoZm Mm{hE & (i) General Instructions : (i) There are a total of 27 questions and four sections in the question paper. All questions are compulsory. (ii) Section A contains questions number 1 to 5, very short-answer type questions of 1 mark each. (iii) Section B contains questions number 6 to 12, short-answer type I questions of 2 marks each. (iv) Section C contains questions number 13 to 24, short-answer type II questions of 3 marks each. (v) Section D contains questions number 25 to 27, long-answer type questions of 5 marks each. (vi) There is no overall choice in the question paper, however, an internal choice is provided in two questions of 1 mark, two questions of 2 marks, four questions of 3 marks and all the three questions of 5 marks. In these questions, an examinee is to attempt any one of the two given alternatives. (vii) Wherever necessary, the diagram drawn should be neat and properly labelled. 57/4/1 2 I S> A SECTION A 1. 1 ~VmBE {H$ { m| | gd Ho$ {bE g Ho$V H$hm go C n Z hmoVo h & State from where do the signals for parturition originate in human females. 2. d emJ{V Ho$ Cg n Q>Z H$m Zm {b{IE {Og | F1 ` $n ( $sZmoQ>mBn) (a) XmoZm| OZH$m| | go Ho$db EH$ OZH$ Ho$ g mZ {XIVm h & (b) XmoZm| | go {H$gr ^r OZH$ Ho$ g mZ Zht hmoVm, daZ XmoZm| Ho$ ~rM H$m gm {XIVm h & 1 Name the pattern of inheritance where F1 phenotype (a) (b) 3. resembles only one of the two parents. does not resemble either of the two parents and is in between the two. hmS>u-doZ~J {g m V Ho$ AZwgma, EH$ g p Q> | Abrb ( w {dH$ nr) Amd { m m EH$g mZ ahVr h & {H$gr g p Q> | Abrb H$s Amd { m m| | n[adV Z H$s `m `m Amn {H$g H$ma H$a|Jo ? AWdm X{jUr A $sH$m | grbmH $W nH$ S>r JB & H$eo {H$ m| Ho$ {dH$mgr B{Vhmg | grbmH $W H$s ImoO H$m h d {b{IE & 1 1 According to the Hardy-Weinberg principle, the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population ? OR Coelacanth was caught in South Africa. State the significance of discovery of Coelacanth in the evolutionary history of vertebrates. 4. EbOu AZw{H $ m | m Q> H$mo{eH$mAm| Ho$ H$m m] H$m C boI H$s{OE & AWdm B Q>a o$am Z Ho$ H$m H$m C boI H$s{OE & 1 1 State the functions of mast cells in allergy response. OR State the function of interpherons. 5. ? What is the cell that receives a recombinant gene called ? nwZ m}OH$ OrZ m V H$aZo dmbr H$mo{eH$m H$mo m H$hVo h 57/4/1 3 1 P.T.O. I S> ~ SECTION B 6. mZd | qbJ JwUgy (H $mo mogmo ) H$s EH$ yZgy Vm Ho$ H$maU hmoZo dmbo {dH$ma H$m Zm {b{IE & BgH$m JwUgy - $n (H $[a moQ>mBn) VWm bjU {b{IE & 2 Name a disorder a human suffers from as a result of monosomy of the sex chromosome. Give the karyotype and write the symptoms. 7. EH$ n[an d namJH$moe H$s AZw W H$mQ> H$m AmaoI ZrMo {X m J m h & Bg | H$mo nhMm{ZE VWm CZHo$ H$m m] H$m C boI H$s{OE & a VWm b 2 a b AWdm AZw r namJU m h ? nm Yo Ho$ {bE BgH$m EH$ bm^ VWm EH$ hm{Z {b{IE & In the T.S. of a mature anther given below, identify a and b and mention their functions. a b OR What is cleistogamy ? Write one advantage and one disadvantage of it, to the plant. 57/4/1 4 2 8. EH$ bgrH$m^ A J Ho$ $n | WmB g H$s ^y{ H$m H$m C boI H$s{OE & BgHo$ mam mo{MV H$mo{eH$mAm| Ho$ Zm {b{IE VWm CZHo$ H$m H$m C boI H$s{OE & 2 State the role of thymus as a lymphoid organ. Name the cells that are released from it and mention their function. 9. X Ym $ newAm| | gm m g J H$s AZoH$ g mAm| na {dO nmZo | H ${ dr goMZ ghm H$ h & m Amn gh V h ? {H$ ht VrZ H$maUm| mam AnZo C ma H$s nwp Q> H$s{OE & 2 Artificial insemination helps overcome several problems of normal mating in cattle . Do you agree ? Support your answer with any three reasons. 10. bmCZ N>br VWm g w r EoZr_moZ Ho$ nma n[aH$-{H $ m (g ~ Y) H$m Zm {bIH$a, BgH$s m m H$s{OE & 2 Name and explain the interaction that is seen between clownfish and sea anemones. 11. C nmXH$Vm, gH$b mW{ H$ C nmXH$Vm, ZoQ> mW{ H$ C nmXH$Vm VWm { Vr H$ C nmXH$Vm | g ~ Y {b{IE & 2 Write the relationship between productivity, gross primary productivity, net primary productivity and secondary productivity. 12. gZ 1987 | {V^mJr am Q >m| mam mo Q >r b moQ>moH$m b na h Vmja H$aZo H$s Amd H$Vm H$mo m g JV {g H$s{OE & AWdm ~ Jby Ho$ Ah X ImZ mam ~ S>o eham| | bmp Q>H$ An{e Q> Ho$ H$m j_ Cn moJ hoVw AnZm`m J`m ^mdr g_mYmZ {b{IE & 2 2 Justify the need for signing of Montreal Protocol by the participating nations in 1987. OR Write the effective remedy found by Ahmed Khan of Bengaluru for the efficient use of the plastic waste generated by big cities. 57/4/1 5 P.T.O. I S> g SECTION C 13. dm {N>V nm Ym| H$s C V {H$ | m V H$aZo Ho$ {bE H ${ g H$aU | {dnw gZ VWm ~ qJJ Xmo h dnyU MaU h & H$maU g{hV m m H$s{OE {H$ {H$g H$ma Ho$ nw nm| | Ed {H$g Va na h XmoZm| H $ g nm{XV {H$E OmZo Mm{hE & AWdm ~VmBE {H$ Ag JOZZ m h & BgH$s CnmXo Vm {b{IE & BgH$m dm{Up H$ Cn moJ H $go {H$ m Om gH$Vm h ? 3 3 Emasculation and bagging are the two important steps carried during artificial hybridisation to obtain superior varieties of desired plants. Explain giving reasons, in which types of flowers and at what stages are the two processes carried out. OR State what is apomixis. Write its significance. How can it be commercially used ? 14. (a) (b) (a) (b) 57/4/1 mZd A S>me H$s AmaoIr H$mQ> H$m {M ~ZmBE VWm {Z Z{b{IV ^mJm| H$mo Zm m {H$V H$s{OE : (i) mW{ H$ nwQ>H$ (ii) { Vr H$ A S>H$ (iii) J m $s nwQ>H$ (iv) nrV qnS> nrV qnS> Ho$ nwQ>H$ {dH$mg H$mo ^m{dV H$aZo dmbo hm m}Zm| Ho$ Zm {b{IE & AWdm rHo$ga H$s b ~dV H$mQ> H$m AmaoI ~ZmBE {Og | namJ Z{bH$m H$mo ^ yU-H$mof | {d Q> hmoVo Xem m J m hmo & Bg | {Z Z{b{IV H$mo Zm m {H$V H$s{OE : (i) ~rOm S>H$m (ii) {V mgm V (iii) ghm H$mo{eH$m (iv) ~rOm S> ma {Z Z{b{IV Ho$ H$m {b{IE : (i) ghm H$mo{eH$m (ii) ~rOm S> ma 6 3 3 (a) (b) Draw a sectional view of human ovary. Label the following parts : (i) Primary follicle (ii) Secondary oocyte (iii) Graafian follicle (iv) Corpus luteum Name the hormones influencing follicular development of corpus luteum. OR (a) (b) 15. Draw an L.S. of pistil showing pollen tube entering into the embryo sac. Label the following : (i) Nucellus (ii) Antipodals (iii) Synergids (iv) Micropyle Write the functions of the following : (i) Synergids (ii) Micropyle Zw H$s bmb {Ya H$mo{eH$mAm| H$s AmH ${V go g ~ {YV hr mo bmo{~Z H$s g JV A em| Ho$ Eo rZmo A b g JR>Z H$mo ZrMo X{e V {H$ m J m h & (a) 57/4/1 - m Ibm Ho$ 3 Eo rZmo A bm| Ho$ AZwH $ H$m h Xe m gm m { V H$mo B {JV H$aVm h AWdm {d{e Q> {Ya g ~ Yr d emJV amoJJ V { V H$mo Xem Vm h ? AnZo C ma Ho$ g W Z | H$maU Xr{OE & 7 P.T.O. (b) Bg amoJ H$mo |S>br {dH$ma m| H$hm OmVm h ? `m `m H$s{OE & AWdm {Z Z{b{IV p W{V m| | Zw | hmoZo dmbo amoJ/{dH$ma Ho$ H$ma H$m Zm {bIH$a CZHo$ H$moB Xmo amoJbjU {b{IE `{X (a) \o${Zb-Eobm{ZZ hmBS >m p gbo O E OmB H$m Hy$Q> boIZ H$aZo dmbo OrZ | C n[ad VZ hmoVm h & (b) H $[a moQ>mBn XXY h & Given below is the representation of a relevant part of amino acid composition of the -chain of haemoglobin, related to the shape of human red blood cells. (a) Is this representation of the sequence of amino acids indicating a normal human or a sufferer from a certain blood related genetic disease ? Give reason in support of your answer. (b) Why is the disease referred to as a Mendelian disorder ? Explain. OR Name the kind of diseases/disorders and any two symptoms that are likely to occur in humans if (a) Mutation in the gene that codes for an enzyme phenylalanine hydroxylase occurs. (b) The karyotype is XXY. 57/4/1 8 3 16. Cg VH$ZrH$ VWm nmXn H$mo{eH$mAm| Ho$ Cg JwUY H$m Zm {b{IE Omo gmo m bmoZ mam dm {N>V bjUm| dmbr go~ H$s {deof {H$ m| Ho$ {dH$mg | ghm H$ hmo gH$Vr h & g_PmBE {H$ go~ H$s dm {N>V {H$ H$mo ~ S>o n mZo na m V H$aZo Ho$ {bE moJembmAm| | gmo m bmoZ {H$g H$ma m V {H$E Om gH$Vo h & 3 Name the technique and the property of plant cells that can help to grow somaclones of certain desired variety of apple. Explain how somaclones of apple can be obtained in the lab so as to get the desired variety on a large scale. 17. ZrMo {XE JE J m $ H$m A Z H$s{OE VWm {Z Z{b{IV Zm| Ho$ C ma Xr{OE (i) dH $ ~ H$mo {Z Z{b{IV g rH$aU mam d{U V H$aVo h : 3 : dN K N rN dt K g rH$aU | K `m h ? BgHo$ (ii) (iii) Bg h d H$m C boI H$s{OE & A{YH$Va m{U g p Q> m| Ho$ {bE XmoZm| | go H$m Z-gm dH $ A{YH$ WmW nyU mZm OmVm h ? {X Amdmg | na^jr AZwnp WV hm| Vmo H$m Z-gm dH $ {haUm| H$s EH$ Om{V H$s g p Q> H$mo Xem EJm ? Eogm m| h ? Study the graph given below and answer the questions that follow : 57/4/1 9 P.T.O. (i) The curve b is described by the following equation : dN K N rN dt K What does K stand for in this equation ? Mention its significance. 18. (ii) Which one of the two curves is considered a more realistic one for most of the animal populations ? (iii) Which curve would depict the population of a species of deer if there are no predators in the habitat ? Why is it so ? D$VH$ H$m EH$ ~h V N>moQ>m Z yZm AWdm {Ya H$s EH$ ~y X {H$gr H$m n V d kmV H$aZo | ghm H$ hmo gH$Vr h & H$WZ H$s gmW H$Vm H$s nwp Q> Ho$ {bE d km{ZH$ m m Xr{OE {H$ h {H$g H$ma g ^d h & 3 A very small sample of tissue or even a drop of blood can help determine paternity. Provide a scientific explanation to substantiate how it is possible. 19. mZd ABO {Ya g yh Ho$ CXmhaU H$s ghm Vm go ^m{dVm, ~h AbrbVm VWm gh ^m{dVm H$s n[aKQ>ZmAm| H$s m m H$s{OE & Explain the phenomena of dominance, multiple allelism co-dominance taking human ABO blood group as an example. 20. 3 and ~ Hw$bmodm ao{gg {Og OrZg Ho$ A VJ V AmVo h CgH$m Zm {b{IE & g mH${bV nr S>H$ ~ YZ H$m H $ m| | CZH$s ^y{ H$m H$m dU Z H$s{OE & 3 Name the genus to which baculoviruses belong. Describe their role in the integrated pest management programmes. 21. H$maU n Q> H$s{OE : (a) S>r.EZ.E. nanmofr H$mo{eH$m H$s H$mo{eH$m {P br H$mo ^oX H$a Zht Jw Oa gH$Vm & (b) AmZwd {eH$ B Or{Z [a J Ho$ {bE S>r.EZ.E. H$mo n WH $ H$aVo g_` moQ>rE O H$m {ZdoeZ {H$ m OmVm h & (c) EH$ g dmhH$ | EH$b bmoqZJ Wb H$mo dar Vm Xr OmVr h & Give reasons why : (a) DNA cannot pass into a host cell through the cell membrane. (b) Proteases are added during isolation of DNA for genetic engineering. (c) Single cloning site is preferred in a vector. 57/4/1 10 3 22. no{Zgr{b ZmoQ>oQ> , moZ H$g na yarAg Ed Q >mBH$moS> m nm {b nmoa Ordm| | go oH$ Ho$ Am fYr y Ed CZHo$ mam C nm{XV O d-g{H $ AUwAm| H$m dU Z H$s{OE & 3 State the medicinal value and the bioactive molecules produced by Penicillium notatum, Monascus perpureus and Trichoderma polysporum. 23. nm {b ao O MoZ [aEo eZ Ho$ {H $ m d Z | (a) C Vmn, (b) mB g , Ed (c) ~ Q>r[a`_ W g E do{Q>H$g H$s ^y{ H$m H$m dU Z H$s{OE & AWdm ~rQ>m-J bo Q>mo{gBS>o O Hy$Q>-AZwH $ daU mo {M H$ Ho$ $n | H $go H$m H$aVm h ? {VO {dH$ {VamoYr OrZm| Ho$ {bE h EH$ ng XrXm daU mo {M H$ m| h ? m m H$s{OE & 3 3 Describe the roles of (a) high temperature, (b) primers, and (c) bacterium Thermus aquaticus in carrying the process of polymerase chain reaction. OR How does -galactosidase coding sequence act as a selectable marker ? Why is it a preferred selectable marker to antibiotic resistance genes ? Explain. 24. ogo gZ Ed Q>mb mam B .H$mobmB na {H$E JE moJ Ho$ AmYma na {Z Z{b{IV Zm| Ho$ C ma Xr{OE : (a) moJ | ZmBQ >moOZ Ho$ EH$ m moV Ho$ $n | Cn moJ {H$E JE amgm {ZH$ nXmW H$m Zm {b{IE & (b) C hm|Zo Ord | h Ho$ Ed Jw (^mar) S>r.EZ.E. AUwAm| H$m g bofU m| hmoZo {X m ? (c) C hm|Zo h Ho$ S>r.EZ.E. AUw go Jw (^mar) S>r.EZ.E. AUwAm| H$s nhMmZ H $go H$s ? m m H$s{OE & (d) moJ Ho$ A V | d km{ZH$m| Ho$ mam {ZH$mbo JE {Z H$f {b{IE & 3 Answer the following questions based on Meselson and Stahl s experiment on E. coli : (a) Write the name of the chemical substance used as the only source of nitrogen in the experiment. (b) Why did they allow the synthesis of the light and the heavy DNA molecules in the organism ? (c) How did they distinguish the heavy DNA molecules from the light DNA molecules ? Explain. (d) Write the conclusion the scientists arrived at, at the end of the experiment. 57/4/1 11 P.T.O. I S X SECTION D 25. EH$ Amd V~rOr | Jw ~rOmUwOZZ H$m nyU {dH${gV ^ yU-H$mof ~ZZo VH$ Ho$ H $ H$m dU Z 5 H$s{OE & AWdm Hw$N> ewH $mUwAm| mam {Kao h E A S>mUw H$m {M ZrMo {X m J m h & {M H$m A Z H$s{OE VWm {Z Z{b{IV Zm| Ho$ C ma {b{IE : 5 B C A D A S>mUw E (a) H$m Z-gm ewH $mUw A S>mUw VH$ g~go nhbo nh MoJm ? (b) D (c) ewH $mUw Ho$ A S>mUw | doe H$aZo _| H$m Z ghm H$ h ? Bg H $ Ho$ Xm amZ A S>mUw | hmoZo dmbo n[adV Z {b{IE & (d) mXm OZZ V Ho$ Cg {d{e Q> Wb H$m Zm {b{IE Ohm {M | Xem m J m H $ g n hmoVm h & VWm E H$mo nhMmZ H$a CZHo$ Zm_ {b{IE & H$s{OE & E H$s ^y{ H$m H$m C boI Describe the process of megasporogenesis upto fully developed embryo sac formation in an angiosperm. OR 57/4/1 12 Given below is the diagram of a human ovum surrounded by a few sperms. Study the diagram and answer the following questions : B C A D Ovum E 26. (a) Which one of the sperms would reach the ovum earlier ? (b) Identify D and E . Mention the role of E . (c) Mention what helps the entry of sperm into the ovum and write the changes occurring in the ovum during the process. (d) Name the specific region in the female reproductive system where the event represented in the diagram takes place. ZrMo {XE JE b H$ MmboH$ (Amonoam Z) | gp {bV OrZm| Ho$ moOZm~ {Z $nU H$m A Z H$aHo$ {Z Z{b{IV Zm| Ho$ C ma {b{IE : p i p o z y a (a) Bg MmboH$ (Amonoam Z) | {Z m H$ OrZ H$mo nhMmZ H$a CgH$m Zm {b{IE & MmboH$ (Amonoam Z) H$s p dqMJ Am $ | BgH$s ^y{ H$m H$s m m H$s{OE & (b) b H$ MmboH$ (Amonoam Z) Ho$ {Z Z H$mo X ZH$mar {Z Z m| H$hVo h (c) MmboH$ (Amonoam Z) Ho$ oaH$ AUw VWm OrZ {b{IE & BZ OrZ C nmXm| Ho$ H$m {b{IE & AWdm (a) hmS>u-doZ~J g rH$aU AmZwd {eH$ g VwbZ H$s m m {H$g H$ma H$aVm h (b) dU Z H$s{OE {H$ h g VwbZ {H$g H$ma {djmo{^V hmoVm h {OgHo$ n[aUm d $n g WmnH$ dmh ( ^md) C n hmo gH$Vm h & 57/4/1 13 5 z Am a y ? Ho$ C nmXm| Ho$ Zm ? 5 P.T.O. Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow : p (a) i p o z y a Identify and name the regulatory gene in this operon. Explain its role in switching off the operon. (b) Why is the lac operon s regulation referred to as negative regulation ? (c) Name the inducer molecule and the products of the genes z and y of the operon. Write the functions of these gene products. OR (a) How does the Hardy-Wienberg equation explain genetic equilibrium ? (b) Describe how this equilibrium is disturbed that may lead to founder effect. 27. (a) ZrMo {XE JE dmh MmQ> H$m A ``Z H$aHo$ {Z Z{b{IV g rH$aU _| 4 H$mo nhMmZ H$a g_rH$aU H$mo nyam H$s{OE & Nt + 1 = Nt + {(1 + 2) (3 + 4)} 57/4/1 14 1, 2, 3 VWm (b) (a) (b) (a) CZ {d{^ VarH$m| H$m C boI H$s{OE {OZHo$ mam {d{^ Om{V m| Ho$ g p Q> KZ d H$m mnZ H$a gH$Vo h & AWdm D$Om Ho$ {na { S> gXm D$ d (grYo I S>r) Ad Wm | hmoVo h & m m H$s{OE & Zm m {H$V AmaoIm| H$s ghm Vm go O d m m Ho$ D$ d (grYo I S>o) {na { S> VWm O d m m Ho$ AYmo wIr (C Q>o) {na { S> | A Va H$s m m H$s{OE & 5 5 Study the flow chart given below and complete the equation that follows by identifying 1, 2, 3 and 4. Nt + 1 = Nt + {(1 + 2) (3 + 4)} (b) Mention the different ways by which the population density of different species can be measured. OR (a) The pyramid of energy is always upright. Explain. (b) Explain with the help of labelled diagrams, the difference between an upright pyramid of biomass and an inverted pyramid of biomass. 57/4/1 15 P.T.O.

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