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CBSE Class 12 Board Exam 2017 : Biology

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SET-1 H$moS> Z . Series GBM Code No. amob Z . 57/1 narjmWu H$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 > 11 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 _| >26 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 11 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 26 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 57/1 Maximum Marks : 70 1 P.T.O. gm_m ` {ZX}e : (i) Z-n _| nm M I S>m| _ o 26 Z {XE JE h & g^r Z A{Zdm` h & (ii) I S> A _| Z g `m 1 go 5 (iii) I S> h & 10 (iv) I S> C _| Z g `m H$m h & (v) I S> D _| Z g `m 23 _y ` AmYm[aV Z 4 A H$m| H$m h & (vi) I S> E _| Z g `m 24 go (vii) Z-n _| g_J na H$moB {dH$ n Zht h , {\$a ^r 2 A H$m| dmbo EH$ Z _|, 3 A H$m| dmbo EH$ Z _| 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$aZm h & B _| Z g `m 6 go 11 go A{V bKw-C mar` Z h , `oH$ Z 1 A H$ H$m h & bKw-C mar` Z H$ma I Ho$ h , `oH$ Z 22 26 bKw-C mar` Z H$ma II 2 Ho$ h , `oH$ Z A H$m| H$m 3 A H$m| XrK -C mar` Z h , `oH$ Z 5 A H$m| H$m h & General Instructions : (i) There are a total of 26 questions and five 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 10, short-answer type I questions of 2 marks each. (iv) Section C contains questions number 11 to 22, short-answer type II questions of 3 marks each. (v) Section D contains question number 23, value based question of 4 marks. (vi) Section E contains questions number 24 to 26, long-answer type questions of 5 marks each. (vii) There is no overall choice in the question paper, however, an internal choice is provided in one question of 2 marks, one question 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. 57/1 2 I S> A SECTION A 1. Cg g H$aU Ho$ H$ma H$m Zm_ ~VmBE {Oggo ~ JZr a J Ho$ \y$bm| dmbo _Q>a Ho$ nm Yo H$m OrZ $n nVm bJmZo _| ghm`Vm {_bVr h & 1 Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers. 2. Amon [aZ Am a hm S>oZ H$s OrdZ H$s C n{ m Ho$ g X^ _| Xr JB Xmo YmaUmAm| H$m C boI H$s{OE & 1 State two postulates of Oparin and Haldane with reference to origin of life. 3. Jm`m| Ho$ EH$ Pw S> _| OZZ-j_Vm Am a C nmXH$Vm H$s H$_r p Q>JmoMa hmoVr h & Bg g_ `m na nma nmZo Ho$ {bE EH$ H$maU Am a EH$ gwPmd Xr{OE & 1 A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem. 4. H $mB OrZ `m hmoVo h ? `h {H$g Ord _| nmE OmVo h ? 1 What are Cry genes ? In which organism are they present ? 5. {H$gr Vmn {~Obr g ` _| EH$ p Wa-d wV Adjo{n H$B h Oma C dmo Q>Vm C n H$aZo _| g_W Zht h & BgHo$ H$maU hmoZo dmbm nm[aV r` n[aUm_ {b{IE & 1 An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it. I S> B SECTION B 6. namJH$moe go \w$Q>Z Ho$ g_` EH$ Eop O`mo n_ _| namJH$U 2-H$mo{eH$s` hmo gH$Vm h AWdm 3-H$mo{eH$s` & `m `m H$s{OE & 2-H$mo{eH$s` Ad Wm na namJH$U Ho$ P S>Vo g_` H$mo{eH$mE {H$g H$ma `dp WV hmoVr h ? 2 A pollen grain in angiosperm at the time of dehiscence from an anther could be 2-celled or 3-celled. Explain. How are the cells placed within the pollen grain when shed at a 2-celled stage ? 57/1 3 P.T.O. 7. ZrMo {XE JE AmZwd {eH$ Hy$Q>m| _| A Va ~VmBE : (a) Ag {X Y Am a gmd { H$ (b) An m{gV Am a ma ^H$ 2 Differentiate between the genetic codes given below : 8. (a) Unambiguous and Universal (b) Degenerate and Initiator {Z Z{b{IV _| go `oH$ H$m EH$-EH$ AZw `moJ ~VmBE (a) {Zp H $` {VajrH$aU (b) {V{h Q>m{_Z (c) ZdX Y (d) gmBQ>moH$mB{ZZ-amoY : 2 Mention one application for each of the following : 9. 57/1 (a) Passive immunization (b) Antihistamine (c) Colostrum (d) Cytokinin-barrier CZ gy _Or{d`m| Ho$ Zm_ ~VmBE Omo {Z Z{b{IV C nmXm| Ho$ `mdgm{`H$ C nmXZ _| ghm`Vm H$aVo h : (a) Q> {Q>Z (b) {g{Q >H$ A b (c) no{Z{gbrZ (d) `y{Q>[aH$ A b 2 4 Name the microbes that help production of the following products commercially : 10. (a) Statin (b) Citric acid (c) Penicillin (d) Butyric acid CFCs H$m 2 Cn`moJ ~ X H$aZo go _mZd OrdZ H$mo hmoZo dmbo Mma bm^m| H$s gyMr ~ZmBE & AWdm CZ Xmo {d{Y`m| H$m EH$-EH$ CXmhaU XoVo h E gwPmd Xr{OE, Omo {dabo AWdm g H$Q>mn nrer O H$s gwajm H$aZo _| ghm`Vm H$aVr h & 2 List four benefits to human life by eliminating the use of CFCs. OR Suggest two practices giving one example of each, that help protect rare or threatened species. I S> C SECTION C 11. 57/1 (a) `m _w ~B _| CJ ahm H$moB nm Ym Cgr nrer O Ho$ ZB {X r _| CJ aho nm Yo Ho$ namJH$Um| Ho$ mam nam{JV hmo gH$Vm h ? AnZo C ma Ho$ {bE n Q>rH$aU Xr{OE & (b) EH$ Eogo rHo$ga H$m AmaoI ~ZmBE Ohm namJU g\$bVmnyd H$ g n hmo MwH$m h & CZ ^mJm| H$mo Zm_m {H$V H$s{OE Omo Za `w _H$m| H$mo CZHo$ dm {N>V WmZ VH$ nh MmZo _| {Z{hV hmoVo h & (a) Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi ? Provide explanations to your answer. (b) Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination. 5 3 P.T.O. 12. hr_mo \$s{b`m Am a W bmgr{_`m _mZdm| Ho$ Xmo {Ya-g ~ {YV {dH$ma h & CZHo$ H$maU ~VmBE VWm XmoZm| Ho$ ~rM A Va ^r n Q> H$s{OE & AmZwd {eH$ {dH$ma H$s Cg loUr H$m Zm_ ~VmBE {OgHo$ A VJ V `o XmoZm| AmVo h & 3 Both Haemophilia and Thalassemia are blood related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under. 13. 14. (a) _mZd OrZmo_ n[a`moOZm _| {Z{hV Xmo Um{b`m| H$s gyMr ~ZmBE & ~VmBE {H$ C h| {H$g H$ma `w V {H$`m J`m Wm & (b) YAC H$m nyam Zm_ ~VmBE Am a C boI H$s{OE {H$ Cgo {H$gHo$ {bE B Vo_mb {H$`m J`m Wm & (a) List the two methodologies which were involved in human genome project. Mention how they were used. (b) Expand YAC and mention what was it used for. am_m{n{WH$g, S >m`mo{n{WH$g Am a {ZEo S>aWb _mZd H$s {d{e Q>VmE ~VmBE & 3 3 Write the characteristics of Ramapithecus, Dryopithecus and Neanderthal man. 15. _mZd _b nXmW go g X {fV Ob Am a ^moOZ Ho$ godZ Ho$ H$maU _mZdm| _| \ $bZo dmbm amoJ, CgH$m amoJH$maH$ Ord, amoJbjU (H$moB VrZ) VWm CgHo$ do Q>a H$m Zm_ ~VmBE & 3 AWdm 57/1 (a) A{^^mdH$m| H$mo Bg ~mV H$m S>a `m| ahVm h {H$ H$ht CZHo$ {H$emo a Am{lV ~ m| H$mo Zerbo nXmWm]/_{Xam H$s bV Z n S> OmE ? (b) {H$emoa ~ m| H$mo Zerbo nXmWm]/_{Xam H$s bV n S> OmZo Ho$ g X^ _| `gZ Am a {Z^ aVm (dependence) H$s `m `m H$s{OE & 6 3 Name a human disease, its causal organism, symptoms (any three) and vector, spread by intake of water and food contaminated by human faecal matter. OR 16. 17. (a) Why is there a fear amongst the guardians that their adolescent wards may get trapped in drug/alcohol abuse ? (b) Explain addiction and dependence in respect of drug/alcohol abuse in youth. (a) H$moB {H$gmZ AnZr J o H$s \$gb _| H$m Z-go dm {N>V bjU XoIZm MmhVm h (b) dm {N>V bjUm| dmbm J m CJmZo _| nmXn OZZ VH$ZrH$m| Zo C mar ^maV Ho$ {H$gmZm| H$s {H$g H$ma _XX H$s ? ? (a) Write the desirable characters a farmer looks for in his sugarcane crop. (b) How did plant breeding techniques help north Indian farmers to develop cane with desired characters ? dm{hV _b Ho$ { Vr`H$ CnMma H$mo O {dH$ CnMma ^r H$hVo h & Bg H$WZ H$s nwp Q> H$s{OE VWm {H $`m H$s `m `m H$s{OE & 3 3 Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process. 18. 57/1 (a) nwZ`m}JO DNA ~ZmZo _| {dbmo_mZwH $_r `yp bAmoQ>mBS> AZwH $_ Ho$ _h d H$s `m `m H$s{OE & (b) Cn`w $ {H $`m _| {V~ YZ E S>mo `yp bEo O H$m Cn`moJ ~VmBE & (a) Explain the significance of palindromic nucleotide sequence in the formation of recombinant DNA. (b) Write the use of restriction endonuclease in the above process. 7 3 P.T.O. 19. {H $`m _| Vmn, mB_am| Am a OrdmUw W_ g E do{Q>H$g H$s ^y{_H$mAm| H$m dU Z H$s{OE & PCR 3 Describe the roles of heat, primers and the bacterium Thermus aquaticus in the process of PCR. 20. H ${ _ B gw{bZ Ho$ C nmXZ _| {Z{hV {d{^ MaUm| H$s `m `m H$s{OE & 3 Explain the various steps involved in the production of artificial insulin. 21. 22. (a) Ord g $nr hmo gH$Vo h AWdm {Z`m_H$ & Bg H$WZ H$s `m `m H$s{OE VWm `oH$ H$m EH$-EH$ CXmhaU Xr{OE & (b) mUr OJV _| {Z`m_H$m| H$s Anojm g $nr A{YH$ `m| hmoVo h (a) Organisms may be conformers or regulators. Explain this statement and give one example of each. (b) Why are there more conformers than regulators in the animal world ? ? C nmXH$Vm, gH$b mW{_H$ C nmXH$Vm Am a ew C nmXH$Vm Ho$ ~rM nma n[aH$ g ~ Y H$m dU Z H$s{OE & 3 3 Describe the inter-relationship between productivity, gross primary productivity and net productivity. I S> D SECTION D 23. 57/1 Am_Vm a na `h XoIm OmVm h {H$ b {JH$Vm Am a OZZ Ho$ ~mao _| _mVm-{nVm AnZo {H$emoa ~ m| Ho$ gmW IwbH$a MMm H$aZo _| CbPZ _hgyg H$aVo h & _mVm-{nVm H$s Bg CbPZ H$m n[aUm_ `h hmoVm h {H$ ~ o H$^r-H$^r ^Q>H$ OmVo h & (a) AmnH$s am` _| BZ {df`m| Ho$ ~mao _| AnZo ~ T>Vo ~ m| Ho$ gmW IwbH$a MMm Z H$aZo Ho$ nrN>o Hw$N> _mVm-{nVmAm| H$s CbPZm| H$m `m H$maU h ? `m `m H$s{OE & (b) EH$ WmZr` nm Yo Am a EH$ O Vw H$m CXmhaU XoVo h E, Amn BZ _mVm-{nVmAm| H$s OZZ Am a b {JH$Vm Ho$ ~mao _| BZ CbPZm| go nma nmZo _| {H$g H$ma ghm`Vm H$a|Jo ? 8 4 It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes. (a) Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children. (b) By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality ? I S> E SECTION E 24. (a) Zma Jr Ho$ EH$ ~rO H$mo O~ {ZMmo S>m OmVm h , V~ EH$ ^ yU Ho$ WmZ na AZoH$ ^ yU XoIo OmVo h & g_PmBE {H$ `h {H$g H$ma g ^d h & (b) `m `o ^ yU AmZwd {eH$ $n go g_mZ hmoVo h AWdm {^ ? MMm H$s{OE & AWdm (a) EH$ _mZd r Ho$ AmV d MH $ H$s {Z Z{b{IV md WmAm| H$s `m `m H$s{OE : (i) AmV d md Wm (ii) nwQ>H$s` md Wm (iii) nrVqnS> ( `y{Q>Ab) md Wm AmV d MH $ H$s ghr-ghr OmZH$mar n[adma {Z`moOZ _| A `{YH$ ghm`Vm H$a gH$Vr h & `m Amn Bg H$WZ go gh_V h ? AnZo C ma Ho$ {bE H$maU Xr{OE & 4+1=5 (b) 3+2=5 (a) When a seed of an orange is squeezed, many embryos, instead of one are observed. Explain how it is possible. (b) Are these embryos genetically similar or different ? Comment. OR 57/1 9 P.T.O. (a) 25. Explain the following phases in the menstrual cycle of a human female : (i) Menstrual phase (ii) Follicular phase (iii) Luteal phase (b) A proper understanding of menstrual cycle can help immensely in family planning. Do you agree with the statement ? Provide reasons for your answer. (a) {H$gr nrer O H$s g_p Q> d { Ho$ ~VmVo h E VwbZm H$s{OE & (b) S>m{d Z mam ~VmB JB nrer O H$s j_Vm H$s `m `m H$s{OE & AWdm (a) nm[ap W{VH$s` {na {_S> `m hmoVm h ? D$Om , O d-g h{V Am a g `m Ho$ {na {_S>m| H$s VwbZm H$s{OE & nm[ap W{VH$s` {na {_S>m| H$s H$moB Xmo gr_mE ~VmBE & 4+1=5 (b) J-AmH$ma Am a S-AmH$ma _m S>bm| H$s H$maU 3+2=5 (a) Compare, giving reasons, the J-shaped and S-shaped models of population growth of a species. (b) Explain fitness of a species as mentioned by Darwin. OR (a) What is an ecological pyramid ? Compare the pyramids of energy, biomass and numbers. 26. (b) Write any two limitations of ecological pyramids. (a) t-RNA (b) AUw H$s g aMZm Am a CgHo$ H$m` H$m dU Z H$s{OE & Bgo EH$ AZwHy$br AUw `m| H$hVo h ? gwH|$ H$s H$mo{eH$m _| hn-RNA g_~ YZ H$s {H $`m H$s `m `m H$s{OE & 3+2=5 AWdm B . H$mobmB _| b H$ -Amonoam Z Ho$ {d{dY KQ>H$m| H$mo ~VmBE & BgH$s AmonZ Ad Wm _| 5 A{^ `{ V H$s `m `m H$s{OE & 57/1 10 (a) Describe the structure and function of a t-RNA molecule. Why is it referred to as an adapter molecule ? (b) Explain the process of splicing of hn-RNA in a eukaryotic cell. OR Write the different components of a lac-operon in E. coli. Explain its expression while in an open state. 57/1 11 P.T.O.

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