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CBSE Class XII 2014 : BIOLOGY

12 pages, 97 questions, 27 questions with responses, 34 total responses,

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H$moS> Z . Series OSR Code No. amob Z . 57/1 narjmWu H$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 > 12 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 _| >30 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 12 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 30 questions. Please write down the Serial Number of the question before attempting it. 15 minutes 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$) BIOLOGY (Theory) {ZYm [aV g_` : 3K Q>o A{YH$V_ A H$ : 70 Time allowed : 3 hours 57/1 Maximum Marks : 70 1 P.T.O. gm_m ` {ZX}e : (i) g^r Z A{Zdm` h & (ii) Bg Z-n _| Mma I S> A, B, C Am a D h & I S> A _| 8 Z h {OZ_| `oH$ H$m EH$ A H$ h , I S> B _| 10 Z h {OZ_| `oH$ Ho$ Xmo A H$ h , I S> C _| 9 Z h {OZ_| `oH$ Ho$ VrZ A H$ h VWm I S> D _| 3 Z h {OZ_| `oH$ Ho$ nm M A H$ h & (iii) H$moB g_J M`Z-{dH$ n (AmodaAm b Mm Bg) Cnb Y 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 & Eogo Zm| _| {d mWu H$mo Ho$db EH$ hr {dH$ n H$m C ma XoZm h & (iv) Ohm ^r Amd `H$ hmo, ~ZmE OmZo dmbo AmaoI gm \$-gwWao VWm g_w{MV $n _| Zm_m {H$V hm| & General Instructions : (i) All questions are compulsory. (ii) This question paper consists of four Sections A, B, C and D. Section A contains 8 questions of one mark each, Section B is of 10 questions of two marks each, Section C is of 9 questions of three marks each and Section D is of 3 questions of five marks each. (iii) There is no overall choice. However, an internal choice has been provided in one question of 2 marks, one question of 3 marks and all the three questions of 5 marks weightage. A student has to attempt only one of the alternatives in such questions. (iv) Wherever necessary, the diagrams drawn should be neat and properly labelled. 57/1 2 I S> A SECTION A 1. 1 \y$b Ho$ Cg ^mJ H$m Zm_ ~VmBE {OgH$m {V $nU ^w >o H$s Jw r Ho$ \w $XZo H$aVo h & Name the part of the flower which the tassels of the corn-cob represent. 2. _Q>a Ho$ nm Yo Ho$ ~rOm| Ho$ g ~ Y _| Eogo H$moB Xmo na na {damoYr bjU ~VmBE {OZH$m _o S>ob Zo A ``Z {H$`m Wm & 1 Mention any two contrasting traits with respect to seeds in pea plant that were studied by Mendel. 3. _mZdm| _| mW{_H$ {Vajm AZw{H $`m H$s Anojm { Vr`H$ {Vajm AZw{H $`m A{YH$ Vrd `m| hmoVr h ? 1 Why is secondary immune response more intense than the primary immune response in humans ? 4. {H$gr {dOmVr` DNA Ho$ {bE Eogm `m| g ^d Zht h {H$ dh H $mo_mogmo_ H$s b ~mB _| {H$gr ^r OJh na CgH$m hr A e ~Z OmE Am a gm_m ` $n go {VH ${V`Z H$aVm aho ? 1 Why is it not possible for an alien DNA to become part of a chromosome anywhere along its length and replicate normally ? 5. _mZd B gw{bZ _| C no Q>mBS> 1 H$s ^y{_H$m ~VmBE & State the role of C peptide in human insulin. 6. nwZ`m}JO DNA m mo{JH$s Ho$ {bE Ordm dr` (~ Q>r[a`b) VWm H$dH$s` H$mo{eH$mAm| _| DNA Ho$ n W H$aU _| B Vo_mb {H$E OmZo dmbo E OmB_m| Ho$ Zm_ {b{IE & 1 Name the enzymes that are used for the isolation of DNA from bacterial and fungal cells for recombinant DNA technology. 7. 1 Jm go H$m {V nYm _H$ AndO Z {g m V ~VmBE & State Gause s Competitive Exclusion Principle. 8. Cg gmhM` - $n H$m Zm_ {b{IE Omo OrZg bmo_g C Va nm Ym| Ho$ gmW hmoVm Xem Vr h & 1 Name the type of association that the genus Glomus exhibits with higher plants. 57/1 3 P.T.O. I S> B SECTION B 9. _mZd d fU CXa Jwhm Ho$ ~mha `m| p WV hmoVo h ? Cg W br H$m Zm_ {b{IE {OgHo$ ^rVa do _m OyX hmoVo h & 2 Why are the human testes located outside the abdominal cavity ? Name the pouch in which they are present. 10. Z nS > JZ _|, O~ `WmW OZZH$mar bmb \y$b (RR) dmbo nm Ym| H$m `WmW OZZH$mar g \o$X \y$b (rr) dmbo nm Ym o Ho$ gmW g H$aU H$am`m J`m Vmo CZH$s g VmZ| Eogo nm Yo ~Zo {OZ_| g^r \y$b Jwbm~r a J Ho$ Wo & (a) Jwbm~r \y$bm| H$m H$Q> hmoZm gp _lU Zht H$hbmVm & Eogm `m| (b) Bg n[aKQ>Zm H$mo {H$g Zm_ go OmZm OmVm h 2 ? ? In Snapdragon, a cross between true-breeding red flowered (RR) plants and true-breeding white flowered (rr) plants showed a progeny of plants with all pink flowers. (a) (b) 11. The appearance of pink flowers is not known as blending. Why ? What is this phenomenon known as ? _mZd g_p Q> _| gh ^m{dVm VWm ~h {dH$ nVm H$s n[aKQ>ZmAm| H$mo EH$ CXmhaU H$s ghm`Vm go n > H$s{OE & 2 With the help of one example, explain the phenomena of co-dominance and multiple allelism in human population. 12. \$b-_ Ir H$m d km{ZH$ Zm_ {b{IE & _m J Z Zo AnZo `moJm| _| \$b-_p I`m| H$m hr `m| Cn`moJ {H$`m ? H$moB VrZ H$maU {b{IE & AWdm OrZm| H$s ghb ZVm Ed CZH$m {d{Z_` EH$-X gao Ho$ {dH$ nr h & EH$ CXmhaU H$s ghm`Vm go Bg H$WZ H$mo `m`g JV H$s{OE & 57/1 4 2 Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments ? State any three reasons. OR Linkage and crossing-over of genes are alternatives of each other. Justify with the help of an example. 13. Eo Ho$[agVm (Eo Ho$[aE{gg) Ho$ amoJbjUmo H$s gyMr ~ZmBE & {H$gr d W `{ $ _| `h g H $_U {H$g H$ma nh MVm h ? 2 List the symptoms of Ascariasis. How does a healthy person acquire this infection ? 14. {H$gr nm[ap W{VH$s g doXZerb jo _| OrZg `yp bAmonm {bhoS >modmBag H$s _h dnyU ^y{_H$m g_PmBE & 2 Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area. 15. aop Q > eZ ( {V~ YZ) `yp bE O {H$g H$ma H$m` H$aVm h ? g_PmBE & 2 How does a restriction nuclease function ? Explain. 16. 2 nmaOrZr mUr {Z Z{b{IV Ho$ {df` _| {H$g H$ma bm^H$mar {g h E h :$ (a) O {dH$s` C nmXm| Ho$ C nmXZ (b) amgm`{ZH$ gwajm narjU How have transgenic animals proved to be beneficial in : (a) Production of biological products (b) Chemical safety testing 17. A Ora Ho$ d j Am a VV `o Ho$ ~rM na na g ~ Y H$m dU Z H$s{OE Am a Cg n[aKQ>Zm na {Q> nUr H$s{OE Omo CZHo$ g ~ Y _| H$m` H$aVr h & 2 Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship. 18. EH$ Eogm Am`w {na {_S> ~ZmBE {Og_| _mZd OZg `m H$s gaUerb d { H$s p W{V X{e V hmoVr hmo & 2 Construct an age pyramid which reflects an expanding growth status of human population. 57/1 5 P.T.O. I S> C SECTION C 19. Eogr {H$ ht VrZ ~{h: OZZ `w{ $`m| H$s gyMr ~ZmBE Omo nw nr nm Ym| _| {dH${gV h B h Am a g_PmBE {H$ do na-namJU H$mo {H$g H$ma mo gm{hV H$aZo _| _XX H$aVr h & 3 AWdm Amd V~rOr Ho$ namJH$moem| H$mo { H$mo R>r `m| H$hm OmVm h g aMZm H$m dU Z H$s{OE & ? BgH$s bKw~rOmUwYmZr H$s Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. OR Why are angiosperm anthers called dithecous ? Describe the structure of its microsporangium. 20. `{X bmoJm| H$mo A{YH$ H$maJa XoI^mb Ed ghm`Vm XmZ H$aZo Ho$ {bE ~ohVa VH$ZrH|$ Ed ZB aUZr{V`m AnZmB OmZr Amd `H$ h , Vmo Eop Z`mog|Q>o{gg na d Ym{ZH$ {V~ Y `m| bJm`m J`m h ? Bg VH$ZrH$ Ho$ Cn`moJ Ho$ {df` _ | {b{IE Am a {V~ Y H$mo C{MV R>hamZo Ho$ nj _| H$maU Xr{OE & 3 If implementation of better techniques and new strategies are required to provide more efficient care and assistance to people, then why is there a statutory ban on amniocentesis ? Write the use of this technique and give reason to justify the ban. 21. _mZd AmZwd {eH$s Ho$ A ``Z _| d emdbr {d bofU `m| {H$`m OmVm h ? Bggo {ZH$mbo Om gH$Zo dmbo {Z H$f {b{IE & Why is pedigree analysis done in the study of human genetics ? State the conclusions that can be drawn from it. 57/1 6 3 22. ZrMo Xr Om ahr gmaUr _| g `m qgS >mo_ a , b , c , d , e VWm f `m h , nhMm{ZE : 3 H$maU qbJ ^m{dV `p Q>`m| H$s {d{e Q>VmE Za/_mXm/XmoZm| 21 H$s a 1. S>mD$Z 2. c XXY 3. Q>Z a 45 Am a XO (i) (ii) b Hw$b {_bmH$a nw OmVr` n[adY Z d e (i) (ii) f { gy Vm Identify a , b , c , d , e and f in the table given below : No. Cause 1. Down s Trisomy of 21 2. c XXY 3. 23. Syndrome Turner s 45 with XO Characteristics of affected individuals Sex Male/Female/Both a (i) (ii) b Overall masculine development d e (i) (ii) f AmnHo$ Hy$b Ho$ gm_wXm{`H$ godm {d^mJ Zo Hy$b Ho$ nmg dmbo EH$ J Xr ~ Vr jo Ho$ {ZarjU H$s `moOZm ~ZmB {OgH$m C o ` Wm dhm Ho$ {Zdm{g`m| H$mo dm ` Ed dm `-ajm Ho$ {df` _| {e{jV H$aZm & ? (a) Eogr _wbm H$mVm| Ho$ JR>Z H$aZo H$s `m| Amd `H$Vm h (b) 57/1 3 CZ H$X_m| Ho$ {df` _| {b{IE Omo Amn Bg {d^mJ Ho$ EH$ gX ` Ho$ $n _| CZHo$ gmW ~mVMrV _| CR>mE Jo Vm{H$ do EH$ d W OrdZ Mbm gH|$ & 7 P.T.O. Community Service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene. (a) Why is there a need to organise such visits ? (b) Write the steps you will highlight, as a member of this department, in your interaction with them to enable them to lead a healthy life. 24. ZrMo {XE Om aho J m \$ _| Om{V jo \$b g ~ Y {XIm`m J`m h & CgHo$ AmJo nyN>o Om aho Zm| Ho$ {ZX}emZwgma C ma Xr{OE & (a) (b) nm[ap W{VH$s-{deofkm| mam ImoOr JB V~ H$s do p W{V`m {b{IE O~ (aoIm H$m T>bmZ) ahVm h (i) 0.1 VWm 0.2 Ho$ ~rM (ii) 0.6 VWm 1.2 Ho$ ~rM Z `m ` $ H$aVm h ? (c) 57/1 Cg H ${V-d km{ZH$ H$m Zm_ {b{IE {OgZo J m \$ _| Xem E JE g ~ Y Ho$ H$ma H$m A ``Z {H$`m Wm & CgHo$ mam {H$E JE ojU {b{IE & aoIm b H$m T>bmZ H$~ X amamohr ~Z OmEJm 8 ? Z H$m _mZ 3 The following graph shows the species area relationship. Answer the following questions as directed. (a) Name the naturalist who studied the kind of relationship shown in the graph. Write the observations made by him. (b) Write the situations as discovered by the ecologists when the value of Z (slope of the line) lies between 0.1 and 0.2 (ii) 0.6 and 1.2 (i) What does Z stand for ? (c) 25. When would the slope of the line b become steeper ? Cg VH$ZrH$ H$m Zm_ {b{IE Ed CgH$m dU Z H$s{OE {OgHo$ mam CZ DNA I S>m| H$mo n WH $ H$aZo _| ghm`Vm {_bVr h Omo aop Q > eZ ( {V~ YZ) E S>mo `yp bE O H$m Cn`moJ H$aHo$ ~ZVo h & 3 Name and describe the technique that helps in separating the DNA fragments formed by the use of restriction endonuclease. 26. nmofU-MH $ _| Hw$ S> H$m `m H$m` hmoVm h , {b{IE & H ${V _| H$m~ Z-MH $ H$m gabrH $V _m S>b g_PmBE & 3 State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature. 57/1 9 P.T.O. 27. n dr na OrdZ Ho$ CX ^d go Ama ^ H$aHo$ Om{V`m| H$s gm_y{hH$ {dbmon KQ>ZmE nm M ~ma h B h & (i) hmb _| J{Verb N>R>m {dbmon , {nN>br KQ>ZmAm| go {H$g H$ma {^ h (ii) N>R>o {dbmon Ho$ {bE _w `V: H$m Z C maXm`r h (iii) 3 Bg AmnXm go {ZnQ>Zo _| ghm`H$ hmo gH$Zo dmbo {H$ ht Mma {~ X Am| H$s gyMr ~ZmBE & ? ? Since the origin of life on Earth, there were five episodes of mass extinction of species. (i) How is the Sixth Extinction , presently in progress, different from the previous episodes ? (ii) Who is mainly responsible for the Sixth Extinction ? (iii) List any four points that can help to overcome this disaster. I S> D SECTION D (a) _mZdm| _| {ZfoMZ H$hm hmoVm h ? Bg {H $`m _| hmoZo dmbr KQ>ZmE g_PmBE & (b) 28. EH$ Eogm `wJb {Og_| n{V Am a n Zr XmoZm o _| hr H$m` erb `w _H$ ~Z aho h , {\$a ^r n Zr J^ dVr Zht hmo ahr, {M{H$ gr` ghm`Vm Vbme ahm h & {H$gr EH$ Eogr {d{Y H$m dU Z H$s{OE {Ogo Amn Cg `wJb H$mo gwPm gH$Vo h , Vm{H$ do gwIr _mVm-{nVm ~Z gH|$ & AWdm (a) (b) (c) 57/1 Ag JOZ{ZH$ ~rOm| Ho$ {dH${gV hmoZo Ho$ {d{^ VarHo$ g_PmBE & `oH$ H$m EH$-EH$ CXmhaU Xr{OE & Ag JOZ{ZH$ ~rOm| go {H$gmZm o H$mo {_bZo dmbm EH$ bm^ ~VmBE & {H$gr EH$ [ ~rOn r ^ yU H$s n[an d Ad Wm H$m Zm_m {H$V AmaoI ~ZmBE & 10 5 (a) Where does fertilization occur in humans ? Explain the events that occur during this process. (b) A couple where both husband and wife are producing functional gametes, but the wife is still unable to conceive, is seeking medical aid. Describe any one method that you can suggest to this couple to become happy parents. OR (a) Explain the different ways apomictic seeds can develop. Give an example of each. (b) (c) Draw a labelled mature stage of a dicotyledonous embryo. (a) {J { \$W Ho$ Cg `moJ Ho$ {d{^ MaUm| H$m dU Z H$s{OE {OgHo$ mam $nm VaUH$mar {g m V H$m {Z H$f {ZH$bm Wm & (b) 29. Mention one advantage of apomictic seeds to farmers. $nm VaUH$mar {g m V H$s amgm`{ZH$ H ${V {H$g H$ma Wm{nV h B Wr ? 5 AWdm B .H$mobmB _| oaH$ H$s Cnp W{V Ed AZwnp W{V, XmoZm| XemAm| _| b H$ Amonoam Z {H$g H$ma H$m` H$aVm h , dU Z H$s{OE & (a) Describe the various steps of Griffith s experiment that led to the conclusion of the Transforming Principle . (b) How did the chemical nature of the Transforming Principle get established ? OR Describe how the lac operon operates, both in the presence and absence of an inducer in E.coli. 57/1 11 P.T.O. 30. AmZwd {eH$s, Amp dH$ O {dH$s VWm D$VH$ g dY Z _| C {V`m hmoZo go \$gbr nm Ym| _ o ZE-ZE {deofH$ Omo S>o Om MwHo$ h & {H$gr \$gb H$s ZB AmZwd {eH$ {H$ _ Ho$ OZZ _| _wI MaUm| Ho$ {df` _| g_PmBE & AWdm (a) new- OZZ H$m C o ` ~VmBE & (b) A V: OZZ H$m _h d Am a CgH$s n[agr_mAm| H$s gyMr ~ZmBE & BZ n[agr_mAm| go H $go nma nm`m Om gH$Vm h ? (c) _do{e`m| VWm _wJm -_w{J `m| H$s EH$-EH$ ZB Z b H$m CXmhaU Xr{OE & With advancements in genetics, molecular biology and tissue culture, new traits have been incorporated into crop plants. Explain the main steps in breeding a new genetic variety of a crop. OR (a) (b) List the importance and limitations of inbreeding. How can the limitations be overcome ? (c) 57/1 State the objective of animal breeding. Give an example of a new breed each of cattle and poultry. 12 5

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