H$moS> Z§.

Code No. 57/C/2

amob Z§. narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð
Roll No. >na Adí` {bIo§ &
Candidates must write the Code on the
title page of the answer-book.

ZmoQ> NOTE
(I) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV (I) Please check that this question
n¥ð> 15 h¢ & paper contains 15 printed pages.

(II) àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS (II) Code number given on the right
>Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na hand side of the question paper
{bI| & should be written on the title page of
the answer-book by the candidate.
(III) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| (III) Please check that this question
>27 àíZ h¢ & paper contains 27 questions.

(IV) H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go (IV) Please write down the Serial
nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$ Number of the question in the
Adí` {bI| & answer-book before attempting it.
(V) Bg àíZ-nÌ H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m (V) 15 minute time has been allotted to
g_` {X`m J`m h¡ & àíZ-nÌ H$m {dVaU read this question paper. The
nydm©• _| 10.15 ~Oo {H$`m OmEJm & question paper will be distributed
10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db at 10.15 a.m. From 10.15 a.m. to
10.30 a.m., the students will
àíZ-nÌ H$mo n‹T>|Jo Am¡a Bg Ad{Y Ho$ Xm¡amZ read the question paper only and
do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo & will not write any answer on the
answer-book during this period.

Ord {dkmZ (g¡ÕmpÝVH$)

BIOLOGY (Theory)

{ZYm©[aV g_` : 3 KÊQ>o A{YH$V_ A§H$ : 70

Time allowed : 3 hours Maximum Marks : 70

.57/B/2 1 P.T.O.
gm_mÝ` {ZX}e :
{ZåZ{b{IV {ZX}em| H$mo ~hþV gmdYmZr go n{‹T>E Am¡a CZH$m g™Vr go nmbZ H$s{OE :
(i) `h àíZ-nÌ nm±M IÊS>m| _§| {d^m{OV {H$`m J`m h¡  H$, I, J, K Am¡a L> &
(ii) Bg àíZ-nÌ _| 27 àíZ h¢ & g^r àíZ A{Zdm`© h¢ &
(iii) IÊS> H$ _| àíZ g§»`m 1 go 5 VH$ ~hþ{dH$ënr` àíZ h¢, àË`oH$ àíZ 1 A§H$ H$m h¡ &

(iv) IÊS> I _| àíZ g§»`m 6 go 12 VH$ bKw-CÎmar` àH$ma-I Ho$ àíZ h¢, àË`oH$ àíZ 2 A§H$m|
H$m h¡ &
(v) IÊS> J _| àíZ g§»`m 13 go 21 VH$ bKw-CÎmar` àH$ma-II Ho$ àíZ h¢, àË`oH$ àíZ
3 A§H$m| H$m h¡ &

(vi) IÊS> K _| àíZ g§»`m 22 go 24 VH$ bKw-CÎmar` àH$ma-III Ho$ àíZ h¢, àË`oH$ àíZ
3 A§H$m| H$m h¡ &

(vii) IÊS> L> _| àíZ g§»`m 25 go 27 VH$ XrK©-CÎmar` àíZ h¢, àË`oH$ àíZ 5 A§H$m| H$m h¡ &

(viii) CÎma g§{já VWm q~Xþdma hmoZo Mm{hE &

(ix) Bg àíZ-nÌ _| g_J« na H$moB© {dH$ën Zht h¡ & VWm{n EH$-EH$ A§H$ dmbo Xmo àíZm| _|,
Xmo-Xmo A§H$m| dmbo EH$ àíZ _§o, VrZ-VrZ A§H$m| dmbo Xmo àíZm| _§o Am¡a nm±M-nm±M A§H$m|
dmbo VrZm| àíZm| _§o Am§V[aH$ {dH$ën {XE JE h¢ & Eogo àíZm| _| Ho$db EH$ hr {dH$ën H$m
CÎma Xr{OE &
(x) Ohm± Amdí`H$ hmo, dhm± gmµ\$-gwWam, AmZwnm{VH$ VWm g_w{MV Zm_m§{H$V {MÌ ~ZmBE &
(xi) BgHo$ A{V[aº$, Amdí`H$VmZwgma, àË`oH$ IÊS> Am¡a àíZ Ho$ gmW `Wmo{MV {ZX}e {XE JE
h¢ &
IÊS> H$
1. _mZd _| ewH«$mUwOZZ àH«$_ _| E\$.Eg.EM. H$s ^y{_H$m h¡ 1

(A) gQ>m}br H$mo{eH$mAm| Ûmam Hw$N> {deof KQ>H$m| Ho$ òdU H$mo CÔr{nV H$aZm &
(B) A§Vambr H$mo{eH$mAm| Ûmam Q>oñQ>moñQ>oam°Z Ho$ òdU H$mo ~m{YV (g§X_Z) H$aZm &
(C) gQ>m}br H$mo{eH$mAm| na Q>oñQ>moñQ>oam°Z H$s {H«$`merbVm H$m CÔrnZ H$aZm &
(D) nr`yf H$mo{eH$mAm| go Eb.EM. (LH) Ho$ òdU H$mo CÔr{nV H$aZm &

.57/B/2 2
General Instructions :

Read the following instructions very carefully and strictly follow them :

(i) This question paper comprises five sections  A, B, C, D and E.

(ii) There are 27 questions in the question paper. All questions are compulsory.

(iii) Section A – Question nos. 1 to 5 are multiple choice questions, carrying

1 mark each.

(iv) Section B – Question nos. 6 to 12 are short-answer questions type-I,

carrying 2 marks each.

(v) Section C – Question nos. 13 to 21 are short-answer questions type-II,

carrying 3 marks each.

(vi) Section D – Question nos. 22 to 24 are short-answer questions type-III,

carrying 3 marks each.

(vii) Section E – Question nos. 25 to 27 are long-answer questions, carrying

5 marks each.

(viii) Answers should be brief and to the point.

(ix) There is no overall choice in the question paper. However, an internal

choice has been provided in two questions of 1 mark, one question of
2 marks, two questions of 3 marks and three questions of 5 marks. Only
one of the choices in such questions have to be attempted.

(x) The diagrams drawn should be neat, proportionate and properly labelled,
wherever necessary.

(xi) In addition to this, separate instructions are given with each section and
question, wherever necessary.

SECTION A

1. The role of FSH in the process of spermatogenesis in humans is to 1

(A) stimulate the secretion of certain factors from Sertoli cells.
(B) inhibit the secretion of testosterone from the interstitial cells.
(C) stimulate the action of testosterone on Sertoli cells.
(D) stimulate the secretion of LH from pituitary cells.
.57/B/2 3 P.T.O.
2. Obr` VWm ñWbr` n`m©daU _| dm`w_ÊS>br` ZmBQ´>moOZ Ho$ pñWarH$aU Ûmam {_Å>r (_¥Xm) H$m
g§dY©Z H$aZo dmbo Hw$N> gm`Zmo~¡ŠQ>r[a`m h¢ 1
(A) amBµOmo{~`_ VWm EoµOmoQ>mo~¡ŠQ>a
(B) EoµOmoñnmB[ab_ VWm ½bmo_g
(C) EoZm~rZm VWm Zm°ñQ>m°H$
(D) EoµOmoñnmB[ab_ VWm EoµOmoQ>mo~¡ŠQ>a
AWdm
ZdXþ½Y (ZdñVÝ`) _mZd ZdOmVm| ({eewAm|) H$mo {ZpîH«$` à{Vajm àXmZ H$aVm h¡ Š`m|{H$
Bg_| {ZåZ à{Vajr hmoVm h¡ : 1
(A) IgA
(B) IgM
(C) IgE
(D) IgG
3. _mZd {ñÌ`m| _| {ZfoMZ H$m {d{eîQ> ñWb h¡ 1
(A) B§\§$S>r~wb_
(B) J^m©e`
(C) Vw§{~H$m (Eoånwbm)
(D) Vw§{~H$m BñW{_H$ g§{YñWb
AWdm
nwéfm| _| E|S´>moOZ hm°_m}Z Ho$ g§íbofU Ed§ òdU H$m {Z`_Z H$aZo dmbo hm°_m}Z H$m Zm_ h¡ 1
(A) Or.EM. (GH)
(B) E\$.Eg.EM. (FSH)>
(C) Eb.EM.> (LH)
(D) àmob¡pŠQ>Z
4. O¡d-àm¡Úmo{JH$s à`moJm| _| Cn`moJ H$s OmZo dmbr ‘AmpÊdH$ H¢$Mr’ h¢ 1
(A) ßb¡pµÁ_S>
(B) à{V~§YZ E§µOmB_
(C) g§dmhH$
(D) {g½_m \¡$ŠQ>a
5. ‘H«$mB© OrZ’ Omo H$sQ>ZmeH$ {df H$m Hy$Q>rH$aU H$aVo h¢, do Bg_| CnpñWV hmoVo h¢ : 1
(A) H$nmg JmobH$ H¥${_
(B) gyÌH¥${_ ({Z_oQ>moS²>g) $
(C) _ŠH$m N>oXH$
(D) ~¡grbg Wy[aZ{OE|{gg
.57/B/2 4
2. Some cyanobacteria in aquatic and terrestrial environment that enrich
the soil by fixing atmospheric nitrogen are 1
(A) Rhizobium and Azotobacter
(B) Azospirillum and Glomus
(C) Anabaena and Nostoc
(D) Azospirillum and Azotobacter
OR
Colostrum provides passive immunity to human infants as it contains
antibody 1
(A) IgA
(B) IgM
(C) IgE
(D) IgG
3. The specific site for fertilisation in human female is 1
(A) Infundibulum
(B) Uterus
(C) Ampulla
(D) Ampullary isthmic junction
OR
The hormone that regulates the synthesis and secretion of androgens in
human males is 1
(A) GH
(B) FSH
(C) LH
(D) Prolactin
4. In biotechnology experiments, ‘molecular scissors’ used are 1
(A) Plasmid
(B) Restriction enzymes
(C) Vectors
(D) Sigma factor
5. ‘Cry genes’ that code for insecticidal toxins are present in 1
(A) Cotton bollworms
(B) Nematodes
(C) Corn borer
(D) Bacillus thuringiensis
.57/B/2 5 P.T.O.
 IÊS> I
6. Hw$N> Ord Cna{V (S>m`mnm°µO) _| Š`m| àdoe H$a OmVo h¢ O~{H$ Hw$N> AÝ` J«rî_{ZpîH«$`Vm _|
Mbo OmVo h¢ ? Bg àH$ma Ho$ Ordm| _| go àË`oH$ H$m EH$-EH$ CXmhaU Xr{OE & 2

7. _|S>b Zo nm¡Ym| _| AnyU© à^m{dVm H$s A{^ì`{º$ H$s ì`m»`m Zht H$s & AnyU© à^m{dVm
Xem©Zo dmbo nwîn H$m EH$ CXmhaU Xr{OE &
_|S>b Ho$ Cg {Z`_ H$m Zm_ {bIH$a CgH$m C„oI H$s{OE {OgH$m AZwJ_Z dh OrZ H$aVo
h¢ Omo AnyU© à^m{dVm A{^ì`º$ H$aVo h¢ & 2

AWdm
AmnHo$ AÜ`mnH$ Zo AmnH$mo _Q>a H$m EH$ bå~m nm¡Ym {X`m VWm AmnH$mo `h kmV H$aZo Ho$
{bE H$hm {H$ `h g_`w½_Or AWdm {df_`w½_Or bå~m nm¡Ym h¡ & {XE JE Bg nm¡Yo H$m
OrZr àê$n kmV H$aZo hoVw Amn Š`m Cnm` H$a|Jo ? 2

8. S>r.EZ.E. aÁOwH$m| H$s Y«wdVm Xem©Vo hþE EH$ AZwboIZ BH$mB© H$m EH$ ì`dñWmË_H$ AmaoI
~ZmBE VWm BgHo$ Hy$Q>bI o Z aÁOw, Q>oåßboQ> aÁOw VWm Q>{_©ZoQ>a (g_mnH$) H$mo Zm_m§{H$V
H$s{OE & 2

9. Hw$N> amoJm| Ho$ amoJH$maH$ Ord (amoJmUw) _ÀN>am| Ho$ H$mQ>Zo go _mZd eara _| à{dîQ> hmoH$a Cgo
amoJr ~Zm XoVo h¢ &
Bg àH$ma Ho$ EH$
(i) àmoQ>moµOmoAm O{ZV amoJ H$m Zm_ {bIH$a amoJH$maH$ Ord H$m d¡km{ZH$ Zm_ {b{IE &
(ii) EH$ hobq_W (H¥${_) amoJ H$m Zm_ {bIH$a amoJH$maH$ Ord H$m d¡km{ZH$ Zm_
{b{IE & 2

10. ‘~¡qJJ’ Š`m h¡ ? nwînr nmXnm| Ho$ H¥${Ì_ g§H$aU _| BgH$s _hÎmm (_hÎd) H$m C„oI H$s{OE & 2

11. (a) dm{hV _bOb Ho$ {ÛVr`H$ CnMma go nhbo VWm CnamÝV ~r.Amo.S>r. (BOD) Ho$
ñVa _| A§Va H$m CëboI H$s{OE &
(b) dm{hV _b Ho$ {ÛVr`H$ CnMma Ho$ Xm¡amZ ‘D${U©H$ (âbm°Šg)’ H$m _hÎd {b{IE & 2

12. {H$Ýht Xmo YmÝ` µ\$gbm| Ho$ Zm_ ~VmBE {OÝh| à~brH¥$V {H$`m OmVm h¡ & C„oI H$s{OE,
{H$g àH$ma & 2
.57/B/2 6
 SECTION B

6. Why do some organisms enter into diapause while some others into
aestivation ? Give one example each of such organisms. 2

7. Mendel did not explain the expression of incomplete dominance in plants.

Give an example of flower exhibiting incomplete dominance.

Name and state the Law of Mendel the genes which exhibit incomplete
dominance follow. 2
OR
Your teacher gave you a tall pea plant and asked you to find whether the
plant is homozygous tall or heterozygous tall. How will you proceed to
find the genotype of the given plant ? 2

8. Draw a schematic diagram of a transcription unit with the polarity of the

DNA strands and label coding strand, template strand and terminator. 2

9. Causative organisms of some diseases gain entry into human body

through mosquito bites and make humans suffer from the disease.
Name one such :
(i) protozoan disease along with the scientific name of the causative
organism.
(ii) helminthes disease along with the scientific name of the causative
organism. 2

10. What is ‘bagging’ ? State its importance in artificial hybridization of

flowering plants. 2

11. (a) Mention the difference in the level of BOD before and after the
secondary treatment of sewage water.

(b) Write the importance of ‘flocs’ during the secondary treatment of

sewage. 2

12. Name any two cereal crops that have been fortified. Mention how. 2

.57/B/2 7 P.T.O.
 IÊS> J
13. H$m~©{ZH$ IoVr H$aZo dmbm {H$gmZ µ\$gbm| H$mo hm{Z nhþ±MmZo dmbo nr‹S>H$m| H$mo _maZo Ho$ {bE
OmZ~yPH$a hm{ZH$maH$ agm`Zm| H$m à`moJ Š`m| Zht H$aVm ? VrZ H$maU XoVo hþE H$WZ H$s
ì`m»`m H$s{OE & 3

14. _mZd ewH«$mUw Ho$ VrZ {d{^Þ ^mJm| H$m Zm_ {bIH$a {ZfoMZ àH«$_ _| CZH$s gh^m{JVm
(^y{_H$m) {b{IE & 3

15. Hw$N> {ddm{hV Xån{V`m| (`wJbm|) H$mo {M{H$ËgH$ ‘AmB©.dr.E\$. (IVF)’ H$s gbmh Š`m| XoVo
h¢ ? ‘AmB©.dr.E\$.’ à{H«$`m _| AnZmE OmZo dmbo MaUm| H$s ì`m»`m H$s{OE & 3

16. S>r.EZ.E. à{VH¥${V`Z Ho$ Xm¡amZ ‘à{VH¥${V`Z {ÛemI$’ _| hmoZo dmbr n[aKQ>ZmAm| H$s ì`m»`m
H$s{OE & 3
AWdm
EH$ ggr_Ho$ÝÐH$s H$mo{eH$m _| nmE OmZo dmbo {d{^Þ àH$ma Ho$ Ama.EZ.E. nm°br_aoµOm| Ho$
Zm_ {b{IE & AZwboIZ _| CZH$s ^y{_H$mAm| H$m CëboI ^r H$s{OE & 3

17. Hw$ŠHw$Q> \$m_© Š`m| ~ZmE (ñWm{nV {H$E) OmVo h¢ ? Hw$ŠHw$Q> \$m_© à~§YZ _| {H$Z-{H$Z g§KQ>H$m|
H$m Ü`mZ aIZm Mm{hE ? 3

18. Cg VH$ZrH$ H$m dU©Z H$s{OE {OgH$m Cn`moJ emoY H$m`© Ed§ {dñV¥V AÝdofU hoVw ~‹S>o n¡_mZo
na (~‹S>r _mÌm _|) A{^b{jV S>r.EZ.E. àmßV H$aZo Ho$ {bE à^mdr T>§J go {H$`m OmVm h¡ & 3

19. nmaOrdr O§Vw Š`m h¢ ? Q>rH$m gwajm narjU Ed§ agm`Z gwajm narjU hoVw CZH$m Cn`moJ
{H$g àH$ma {H$`m OmVm h¡ ? ì`m»`m H$s{OE & 3

20. àË`oH$ Ho$ EH$-EH$ g_w{MV CXmhaU H$s ghm`Vm go ~hþà^m{dVm Ed§ AZoH$ OrZr d§emJ{V
Ho$ _Ü` {d^oX H$s{OE & 3
AWdm
Am°no[aZ VWm hmëS>oZ Ûmam àñVm{dV n[aH$ënZm H$m CëboI (dU©Z) H$s{OE & Eg.Eb.
{_ba Zo Bgo à`moJmË_H$ ê$n go {H$g àH$ma {gÕ {H$`m ? ì`m»`m H$s{OE & 3

21. Xmo ghm`H$ OZZ àm¡Úmo{JH$ VH$ZrH|$ (E.Ama.Q>r.), A§V:H$mo{eH$s` ewH«$mUw {ZjonU VWm
A§V:J^m©e`r dr`©goMZ EH$-Xÿgao go {H$g àH$ma {^Þ h¢ ? ì`m»`m H$s{OE & 3
.57/B/2 8
 SECTION C

13. Why does an organic farmer intentionally not use toxic chemicals to kill
the pests which damage his crops ? Explain giving three reasons. 3

14. Name the three different parts of a human sperm and write their
involvement in the process of fertilisation. 3

15. Why do doctors suggest some married couples to go for ‘IVF’ ? Explain the
steps carried out in the process of ‘IVF’. 3

16. Explain the events occurring in a ‘Replicating Fork’ during replication of

DNA. 3
OR

Name the different types of RNA polymerases in a eukaryotic cell. Write

their roles in transcription. 3

17. Why are poultry farms set up ? Write the different components to be kept
in mind in poultry farm management. 3

18. Describe the technique that is very effectively used to get a large amount
of desired DNA for research and detailed investigation. 3

19. What are transgenic animals ? How are they being used for vaccine
safety and chemical safety testing ? Explain. 3

20. Differentiate between pleiotropy and polygenic inheritance by taking one

example of each. 3
OR
State Oparin and Haldane hypothesis. How did S.L. Miller
experimentally prove it ? Explain. 3

21. How are the two Assisted Reproductive Technologies (ART),

intracytoplasmic sperm injection and intrauterine insemination
different ? Explain. 3

.57/B/2 9 P.T.O.
 IÊS> K

22. ~mK dZm| _| ahVo h¢ & h_mao Xoe _| {dJV H$B© XeH$m| _| ~mKm| H$s g_{îQ> H$m AmH$ma KQ>Vm
Om ahm Wm & Bg Xþb©^ ñnrerµO Ho$ g§ajU Ho$ {bE gZ² 1973 _| ‘~mK ~MmAmo’ n[a`moOZm
H$m àmaå^ {H$`m J`m & `h EH$ gwIX AZw^d h¡ {H$ BgHo$ \$bñdê$n {nN>bo Hw$N> XeH$m| _|
h_mao Xoe _| ~mKm| H$s g§»`m/g_{îQ> _| H«${_H$ d¥{Õ hmo ahr h¡ &
{ZåZ àíZm| Ho$ CÎma Xr{OE :

(a) ~mKm| H$s g_{îQ> _| õmg Ho$ {bE CÎmaXm`r EH$ à_wI H$maU H$m CëboI H$s{OE &
(b) O¡d-{d{dYVm g§ajUH$Vm©Am| Ûmam {H$E JE EH$ à_wI à`mg H$mo {b{IE {OgHo$
Ûmam ~mKm| H$s g§»`m/g_{îQ> _| d¥{Õ _| ghm`Vm {_br &
(c) {H$gr dZ joÌ _| ~mKm| H$s g§»`m H$s JUZm H$aZm {H$g àH$ma g§^d hmo nmVm h¡ ?
CëboI H$s{OE & 1+1+1=3

23. Q>r.EM. _moJ©Z Zo S´>mogmo{\$bm _obmZmoJoñQ>a na EH$ H«$m°g H$am`m {Og_| emar[aH$ a§J dmbo
OrZ (y+/y) VWm Am±I Ho$ a§J dmbo OrZ (w+/w) gpå_{bV Wo & H«$m°g Ho$ F1 nr‹T>r VH$ Ho$
ì`dñWmË_H$ àXe© H$m AÜ``Z H$s{OE VWm AZwJm_r àíZm| Ho$ CÎma Xr{OE :

.57/B/2 10
 SECTION D

22. Tigers inhabit forests. Over the past many decades the tiger population
was on the decline in our country. A project ‘Save Tiger’ was launched in
1973 to conserve this precious species. It is heartening to see in the last
couple of decades that there has been a gradual increase in the tiger
population in our country.
Answer the questions :
(a) Mention one major cause responsible for the decline in tiger
population.
(b) Write one main effort of the biodiversity conservationists that
must have helped in the increase in tiger population.
(c) State how it is possible to count the number of tigers in a forest
area. 1+1+1=3

23. T.H. Morgan carried out a cross on Drosophila Melanogaster, involving

genes for body colour (y+/y) and genes for eye colour (w+/w). Study the
schematic representation of the cross upto F1 generation and answer the
questions that follow :

.57/B/2 11 P.T.O.
 (a) `h {Og àH$ma H$m H«$m°g àX{e©V H$aVo h¢, CgH$m Zm_ {b{IE &
(b) Am±I Ho$ a§J Ho$ g§X^© _| à^mdr Ñí`àê$n (\$sZmoQ>mBn) H$mo nhMmZ H$a {b{IE &
(c) Xem©E JE JwUgyÌ na AdpñWV BZ OrZm| H$mo Š`m H$hm OmVm h¡ ? 3

24. {d{^Þ ñnrerµO Ho$ {d{^Þ àH$ma Ho$ d¥{Õ dH«$m| H$mo ZrMo {XE JE J«m\$ _| Xem©`m J`m h¡ &

BgH$m AÜ``Z H$a g§~§{YV àíZm| Ho$ CÎma Xr{OE :

(a) J«m\$ _| d¥{Õ dH«$ ‘a’ Ho$ àH$ma H$m Zm_ {b{IE & 1

(b) d¥{Õ dH«$ ‘b’ H$mo bm°{OpñQ>H$ dH«$ Š`m| H$hm OmVm h¡ ? BgH$m EH$ H$maU {b{IE & 1
dN K – N
(c) bm°{OpñQ>H$ dH«$ Ho$ gmW {XE JE g_rH$aU = rN  _| ‘K’ Š`m
dt  K 
{Zê${nV H$aVm h¡ ? 1

IÊS> L>
25. hmS>u-drZ~J© gmå`Vm _| {djmo^ Š`m B§{JV H$aVm h¡ ? Eogo {H$Ýht Mma KQ>H$m| Ho$ Zm_ {b{IE
Omo Bg gmå`Vm H$mo à^m{dV H$aVo h¢ & ì`m»`m H$s{OE {H$ `h H¡$go à^m{dV hmoVm h¡ & 5
AWdm
‘‘{dH$mg àmH¥${VH$ n[aKQ>ZmAm| _| g§`moJde hmoZo dmbo n[adV©Zm| Ed§ Ordm| _| g§`moJde hmoZo
dmbo CËn[adV©Zm| na AmYm[aV `mÑpÀN>H$ àH«$_ h¡ &’’ EH$ g_w{MV CXmhaU H$s ghm`Vm go
ì`m»`m H$s{OE & 5

.57/B/2 12
 (a) Name the kind of cross it represents.
(b) Identify and write the dominant phenotype with respect to eye
colour.
(c) What are these genes located on the chromosome shown referred to
as ? 3

24. Study the graph given below showing the different types of growth curves
of different species.

Answer the questions :

(a) Name the type of growth curve ‘a’ shown in the graph. 1
(b) State one reason why the growth curve ‘b’ is said to be logistic. 1
dN K – N
(c) What is ‘K’ representing in the equation = rN  given
dt  K 
along the logistic curve. 1

SECTION E

25. State what is disturbance in Hardy-Weinberg equilibrium indicative of.

Write any four factors that affect this equilibrium. Explain how. 5
OR
Explain with the help of one suitable example that ‘‘Evolution is a
random process based on chance events in nature and chance mutation in
the organisms’’. 5
.57/B/2 13 P.T.O.
26. (a) n¥Ïdr na OrdZ H$s CËn{Îm VWm O¡d-{d{dYê$noU (~m`moS>mBd{g©{\$Ho$eZ) go A~
VH$ Ordm| Ho$ ì`mnH$ {dbmonZ H$s {H$VZr n[aKQ>ZmE± hmo MwH$s h¢ VWm dV©_mZ _|
H$m¡Z-gm àJ{V na h¡ ?
(b) nhbo hþE ì`mnH$ {dbmonZm| go {dbmonZ H$s dV©_mZ àJ{V {H$g àH$ma {^Þ h¡ ?
(c) Bg g§X^© _| nm[apñW{VH$s{dXm| H$s qMVmAm| H$mo {b{IE &
(d) EH$ CXmhaU H$s ghm`Vm go gh{dbwßVVm H$s ì`m»`m H$s{OE & 5
AWdm
CÎmar H¡$br\$mo{Z©`m amÁ` Ho$ AH$m©Q>m eha Ho$ {Zdm{g`m| Ûmam An{eîQ> Ob emoYZ H$aZo Ho$
{bE AnZmE JE {d{^Þ MaUm| H$s ì`m»`m H$s{OE & 5

27. EH$ Amd¥V~rOr _| {ZåZ{b{IV àH«$_m| _| hmoZo dmbr n[aKQ>ZmAm| H$m AZwaoIU H$s{OE :
(a) namJ-ñÌrHo$ga g§H$f©U H$m dU©Z namJZ{bH$m Ho$ ~rOmÊS> _| à{dîQ> hmoZo VH$
H$s{OE &
(b) Xmoham {ZfoMZ & 5
AWdm
ñÌr _| A§S>OZZ àH«$_ na AmYm[aV {ZåZ{b{IV àíZm| Ho$ CÎma {b{IE :
(a) `h à{H«$`m H$~ Am¡a H$hm± àma§^ hmoVr h¡ ?
(b) A§S>OZZ Ho$ àH«$_ Ho$ {d{^Þ MaUm| H$s ì`m»`m `m¡dZma§^ _| A§S>moËgJ© hmoZo VH$ H$s
AdñWm VH$ H$s{OE & 5

.57/B/2 14
26. (a) How many episodes of mass extinction since the origin and
biodiversification of life on the Earth have occurred and which one
is presently in progress ?

(b) How is the present one in progress different from the ones that
occurred previously ?

(c) Write the concerns of the ecologists in this respect.

(d) Explain coextinction with the help of an example. 5

OR
Explain the steps carried out in purifying the wastewater by the citizens
of Arcata in the State of Northern California. 5

27. Trace the events that occur in an angiosperm during

(a) Pollen-pistil interaction until pollen tube enters the ovule.

(b) Double fertilisation. 5

OR
Answer the following questions based on the process of oogenesis in
human female :
(a) When and where does the process begin ?
(b) Explain the steps that occur in the process of oogenesis up to
ovulation on the onset of puberty. 5

.57/B/2 15 P.T.O.