CBSE Class 12 Question Paper 2023 Biology (Solved)

Qu e st i o n

P a p e r
2023

Series EF1GH/1 SET~1

Q.P. Code 57/1/1
Roll No. narjmWu àíZ-nÌ H$moS> >H$mo CÎma-nwpñVH$m Ho$
_wI-n¥ð >na Adí` {bIo§ &
Candidates must write the Q.P. Code on
the title page of the answer-book.

Ord {dkmZ (g¡ÕmpÝVH$)
BIOLOGY (Theory)
*
:3 : 70
Time allowed : 3 hours Maximum Marks : 70

NOTE :
(i) - 31
Please check that this question paper contains 31 printed pages.
(ii) - - -
-
Q.P. Code given on the right hand side of the q uestion paper should be written on the title
page of the answer-book by the candidate.
(iii) - 33
Please check that this question paper contains 33 questions.
(iv) -

Please write down the serial number of the question in the answer- book before
attempting it.
(v) - 15 -
10.15 10.15 10.30 -
-
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.

57/1/1 JJJJ Page 1 P.T.O.

:
:
(i) 33

(ii)
(iii) 1 16 (MCQ)
(iv) 17 21 (VSA)

(v) 22 28 (SA)
(vi) 29 30

(vii) 31 33 (LA)
(viii) 1 1
2 3

(ix)

IÊS> H$
1 16 (MCQ) 16 1=16

1. {ZåZ{b{IV àH«$_m| _| go {H$g àH«$_ Ho$ n[aUm_
h¢ ?
(i) CËn[adV©Z
(ii) AY©gyÌU I Ho$ Xm¡amZ ñdV§Ì Anì`yhZ
(iii) AY©gyÌU II Ho$ Xm¡amZ ñdV§Ì Anì`yhZ
(iv) `wJbr H$m {d{Z_`

(a) Ho$db (iv)
(b) (ii) VWm (iv)
(c) (i), (ii) VWm (iii)
(d) (i), (ii), (iii) VWm (iv)
57/1/1 JJJJ Page 2

General Instructions :
Read the following instructions carefully and strictly follow them :
(i) This question paper contains 33 questions. All questions are compulsory.
(ii) This question paper is divided into five sections Section A, B, C, D and E.
(iii) In Section A Questions no. 1 to 16 are multiple choice (MCQ) type questions,
carrying 1 mark each.
(iv) In Section B Questions no. 17 to 21 are very short answer (VSA) type
questions, carrying 2 marks each.
(v) In Section C Questions no. 22 to 28 are short answer (SA) type questions,
carrying 3 marks each.
(vi) In Section D Questions no. 29 and 30 are case-based questions, carrying
4 marks each.
(vii) In Section E Questions no. 31 to 33 are long answer (LA) type questions,
carrying 5 marks each.
(viii) There is no overall choice. However, an internal choice has been provided in
1 question in Section B, 1 question in Section C, 2 questions in Section D and
3 questions in Section E. A candidate has to attempt only one of the
alternatives in such questions.
(ix) Use of calculators is not allowed.

SECTION A

Questions no. 1 to 16 are Multiple Choice (MCQ) type Questions, carrying
1 mark each. 16 1=16

1. Which one of the following processes results in the production of
recombinants in future generations ?
(i) Mutation
(ii) Independent assortment during meiosis I
(iii) Independent assortment during meiosis II
(iv) Crossing over of bivalents

(a) (iv) only
(b) (ii) and (iv)
(c) (i), (ii) and (iii)
(d) (i), (ii), (iii) and (iv)

57/1/1 JJJJ Page 3 P.T.O.

2. ZrMo {XE JE ì`dñWmnH$ {Zê$nU _| Xem©E AZwgma Agr_H|$Ðr _| AZwboIZ àH«$_ _|
gpå_{bV ñWb , \ VWm E§µOmB_ H$mo nhMm{ZE &

ñWb X \ Y E§µOmB_ Z
(a) g_mnH {g½_m ( ) AmaEZE nm°br_aoµO $
(b) CÞm`H amo ( ) AmaEZE nm°br_aoµO $
(c) CÞm`H {g½_m ( ) AmaEZE nm°br_aoµO
(d) CÞm`H {g½_m ( ) S>rEZE nm°br_aoµO

3. _mZd g_{îQ> H$s AdpñW{V H$mo ZrMo {XE JE _mZd Am`w {na¡{_S> Ûmam {Zê${nV {H$`m J`m
h¡ :
OÝ_moÎma

OZZj_

OÝ_nyd©
(a) KQ>Vr g_{îQ>
(b) pñWa g_{îQ>
(c) àgmar g_{îQ>
(d) {dbwßV g_{îQ >
57/1/1 JJJJ Page 4

2. Identify the region
process of transcription in prokaryote as shown in the schematic
representation given below.

Region Factor Y Enzyme Z
(a) Terminator Sigma ( ) RNA polymerase
(b) Promoter Rho ( ) RNA polymerase
(c) Promoter Sigma ( ) RNA polymerase
(d) Promoter Sigma ( ) DNA polymerase

3. The status of the human population reflected in the human age pyramid
given below is :

Post-Reproductive

Reproductive

Pre-Reproductive

(a) Declining population
(b) Stable population
(c) Expanding population
(d) Extinct population

57/1/1 JJJJ Page 5 P.T.O.

4. Ord {dkmZ Ho$ {dÚm{W©`m| Zo AnZo ZJa (eha) Ho$ ~mha ~hZo dmbr EH$ ZXr Ho$ {d{eîQ>
Ho$ ñVa \$ Ûmam
{Zê${nV {H$`m & J«m\$ _| H$m¡Z-gm {~ÝXþ ZXr _| Aemo{YV Ob _b H$s à{d{îQ> ({dgO©Z)
ñWbm| H$mo Xem©Vm h¡ ? $

(a) {~ÝXþ (i) (b) {~ÝXþ (ii) $
(c) {~ÝXþ (iii) $ (d) {~ÝXþ (iv)>
5. ZrMo Xmo ñV§^ {XE JE h¢ & ñV§^ I _| Mma E§µOmB_m| H$mo VWm ñV§^ II _| E§µOmB_m| Ho$ àH$m`m]
H$s gyMr Xr JB© h¡ & {ZåZ{b{IV {dH$ënm| _| go H$m¡Z-gm {dH$ën E§µOmB_m| H$m CZHo$ g§~§{YV
àH$m`m] go _ob H$mo ghr ê$n _| Xem©Vm h¡ ?$
I II

P. S>rEZE bmBJoµO i. S>rEZE Ho$ N>moam| go Ý`y
hQ>mVm h¡
Q. ii. S>rEZE Q>oånboQ> na àmB_a H$mo {dñVm[aV
H$aVm h¡
R. Q>¡H$ nm°br_aoµO iii. S>rEZE IÊ
S. iv. S>rEZE H$mo {d{eîQ> ñWbm| na H$mQ>Vm h¡
:
(a) P-i, Q-ii, R-iv, S-iii (b) P-iv, Q-iii, R-ii, S-i
(c) P-i, Q-iv, R-iii, S-ii (d) P-iii, Q-i, R-ii, S-iv

57/1/1 JJJJ Page 6

4. The graph plotted below is based on the data collected by biology
students with respect to the levels of oxygen at the specific points in the
river flowing outside their city. Which point in the graph indicates the
entry of untreated sewage in the river ?

(a) Point (i) (b) Point (ii)

(c) Point (iii) (d) Point (iv)

5. Given below are two columns. In Column I is the list of four enzymes and
in Column II is the list of functions of the given enzymes. Which one of
the following options shows the enzymes matched with their respective
functions correctly ?
Column I Column II
(Enzyme) (Function)
P. DNA Ligase i. Removes nucleotides from ends of
DNA
Q. Restriction exonuclease ii. Extends primer on a DNA template
R. Taq polymerase iii. Joins the DNA fragments

S. Restriction endonuclease iv. Cuts DNA at a specific position
Options :

(a) P-i, Q-ii, R-iv, S-iii (b) P-iv, Q-iii, R-ii, S-i
(c) P-i, Q-iv, R-iii, S-ii (d) P-iii, Q-i, R-ii, S-iv

57/1/1 JJJJ Page 7 P.T.O.

6. S>rEZE A§Jw{bN>mnr VWm VrZ AÝ` ì`{º$`m| 1, 2 Am¡a 3
Ho$ S>rEZE àmo\$mBbm| H$m AÜ``Z H$s{OE & {ZåZ{b{IV _| go H$m¡Z -
Ho$ g§^m{dV OZH$ hmoZo H$mo Xem©Vm h¡ ?
m ì`{º$ ì`{º$ ì`{º$
X 1 2 3

(a) 1 VWm 2 (b) 2 VWm 3
(c) 1 VWm 3 (d) Ho$db ì`{º$ 3
7. {Oamµ\$ H$s JX©Z H$s b§~mB© Ho$ g§~§Y _| àmH¥${VH$ daU Ho$ àH«$_ H$mo ghr T>§J go n[a^m{fV
H$aZo dmbo {dH$ën H$m M`Z H$s{OE :

(a) ñWm`rH$maH$ daU \$m| H$m CÎmadVu daU hmoVm h¡ &
(b) {dXmaH$ daU {H$ N>moQ>r VWm b§~r JX©Z dmbo {Oamµ\$m| H$m daU hmoVm h¡ &
(c) {XemË_H$ daU {H$ b§~r JX©Z dmbo {Oamµ\$m| H$m daU hmoVm h¡ &
(d) ñWm`rH$maH$ daU {H$ JX©Z H$s _Ü`_ b§~mB© dmbo {Oamµ\$m| H$m daU hmoVm
h¡ &
57/1/1 JJJJ Page 8

6. Study the DNA profiles obtained as a result of DNA fingerprinting of a
g
options shows ?
Child Individual Individual Individual
X 1 2 3

(a) 1 and 2 (b) 2 and 3
(c) 1 and 3 (d) Only individual 3
7. Select the option that gives the correct description of the process of
Natural Selection with respect to the length of the neck of giraffe.

(a) Stabilising selection as giraffes with longer neck lengths are
selected further.
(b) Disruptive selection as giraffes with smaller and longer neck
lengths are selected.
(c) Directional selection as giraffes with longer neck lengths are
selected.
(d) Stabilising selection as giraffes with medium neck lengths are
selected.

57/1/1 JJJJ Page 9 P.T.O.

8. Cg {dH$ën H$m M`Z H$s{OE {Og_| 325 bKw~rOmUw OZH$ (_mV¥) H$mo{eH$mAm| Ho$
bKw~rOmUwOZZ àH«$_ Ûmam ~ZZo dmbo namJH$Um| H$s ghr g§»`m H$mo Xem©`m J`m h¡ &
(a) 325 (b) 650
(c) 1300 (d) 975

9. ZrMo Xmo ñV§^ {XE JE h¢ & ñV§^ I _| Mma J^©{ZamoYH$ `w{º$`m| Ho$ Zm_ {XE JE h¡§ VWm
ñV§^ II _| BZ `w{º$`m| Ho$ J^©{ZamoYr VarH$m| H$mo Xem©`m J`m h¡ & Cg {dH$ën H$m M`Z
H$s{OE {Og_| J^©{ZamoYH$ `w{º$`m| H$mo CZHo$ H$m`m] Ho$ gmW ghr T>§J go gw_o{bV {H$`m J`m
h¡ &$
I II

P. {bßnog byn i. A§S>moËgO©Z H$m g§X_Z
Q. _ëQ>rbmoS> 375 ii. J^m©e` _| ewH«$mUwAm| H$s ^jH$mUw{H«$`m
R. ËdMm Ho$ ZrMo A§Vam}n iii. mZm
S. ghobr iv. J^m©e` J«rdm H$mo ewH«$mUwAm| H$m à{VamoYr ~ZmZm
:
(a) P-ii, Q-iv, R-iii, S-i
(b) P-i, Q-ii, R-iii, S-iv
(c) P-iii, Q-i, R-iv, S-ii
(d) P-iv, Q-iii, R-ii, S-i

10. {ZåZ{b{IV _| go {H$g {dH$ën _| A§V:òmdr J«§{W H$m BgHo$ Ûmam òm{dV hm°_m}Z VWm àH$m`©
Ho$ gmW ghr T>§J go gw_ob {H$`m J`m h¡ ?
A§V:òmdr J«§{W hm°_m}Z àH$m`©
(a) gQ>m}br H$mo{eH$mE± Q>oñQ>moñQ>oam°Z {ÛVr`H$ b¢{JH$ bjUm| H$m {dH$mg
(b) Anam EñQ´>moOZ Xþ½Y òdU H$m g_ma§^Z
(c) br{S>J H$mo{eH$mE± E§S´>moOoZ ewH«$mUwOZZ à{H«$`m H$m g_ma§^Z
(d) A§S>me` E\$.Eg.EM. nwQ>H$s` {dH$mg H$m CÔrnZ H$aVm h¡

57/1/1 JJJJ Page 10

8. Choose the option that gives the correct number of pollen grains that will
be formed after 325 microspore mother cells undergo microsporogenesis.
(a) 325 (b) 650
(c) 1300 (d) 975

9. Given below are two columns. In Column I the names of four
contraceptive devices are given and in Column II the modes of action of
the contraceptives are given. Select the option where the contraceptive
devices are correctly matched with their respective modes of action.
Column I Column II
(Contraceptive devices) (Modes of action)
P. Lippes loop i. Inhibition of ovulation
Q. Multiload 375 ii. Phagocytosis of sperms in uterus

R. Subcutaneous iii. Causes thickening of cervical
Norplant mucous
S. Saheli iv. Makes cervix hostile to sperms
Options :

(a) P-ii, Q-iv, R-iii, S-i
(b) P-i, Q-ii, R-iii, S-iv
(c) P-iii, Q-i, R-iv, S-ii
(d) P-iv, Q-iii, R-ii, S-i

10. In which one of the following options does the endocrine gland correctly
match with its hormonal secretion and its function ?
Endocrine
Hormone Function
Gland
(a) Sertoli cells Testosterone Development of secondary sexual
characteristics
(b) Placenta Estrogen Initiates secretion of milk

(c) Leydig cells Androgen Initiates the production of sperms

(d) Ovary FSH Stimulates follicular development

57/1/1 JJJJ Page 11 P.T.O.

11. H$mohoZ VWm ~mo`a Ûmam 1972 _| H¥${Ì_ nwZ`m}JO S>rEZE Ho$ gd©àW_ {Z_m©U _| Cn`moJ {H$`m
OmZo dmbm Ord Wm :
(a) (b)
(c) (d)

12. {ZåZ{b{IV _| go {H$gZo {_{g{gnr {díd{dÚmb` Ho$ {M{H$Ëgm Ho$ÝÐ H$mo Kmd Ho$ ^aZo
({M{H$Ëgm) Ho$ {bE hëXr Ho$ Cn`moJ H$m noQ>oÝQ> A{YH$ma {XE OmZo H$mo MwZm¡Vr Xr ?
(a) lr AO` \ (b) gwlr dÝXZm {edm
(c) S>m°. doUwJmonmbZ$ (d) S>m°. Ama.E. _eobH$a $

13 16 (A)
(R) (a), (b), (c)
(d)

(a) A{^H$WZ (A) Am¡a H$maU (R) XmoZm| ghr h¢ Am¡a H$maU (R), A{^H$WZ (A) H$s
ghr ì¶m»¶m H$aVm h¡ &
(b) A{^H$WZ (A) Am¡a H$maU (R) XmoZm| ghr h¢, naÝVw H$maU (R), A{^H$WZ (A) H$s
ghr ì¶m»¶m H$aVm h¡ &
(c) A{^H$WZ (A) ghr h¡, naÝVw H$maU (R) µJbV h¡ &
(d) A{^H$WZ (A) µJbV h¡, naÝVw H$maU (R) ghr h¡ &

13. (A) : E.S>r.E. H$s H$_r Ho$ EH$ amoJr H$mo OrZ Xmof Ho$ CnMma hoVw AmZwd§{eH$V:$
{Z{_©V bgrH$mUwAm| H$mo gm_{`H$ A§Vamb na {Zdo{eV (à{dîQ>) H$amZm

(R) : bgrH$mUw A_a h¢ &

14. (A) : njr ~Jwbm Am¡a MmaU (Jm¡) new {ZH$Q> gmhM`© _| ahVo h¢, `h
gh^mo{OVm H$m CËH¥$îQ> CXmhaU h¡ &
(R) : O~ MmaU (Jm¡) new MbVo h¢ Vmo do dZñn{V H$mo {hbmVo h¢, {OgHo$ H$maU
Cg_| go H$sQ> ~mha {ZH$bVo h¢ {OÝh| ~Jwbo ImVo h¢ AÝ`Wm H$sQ>m| H$mo
Ty>± Zm ~Jwbm| Ho$ {bE H${R>Z hmoVm &

57/1/1 JJJJ Page 12

11. The organism used in construction of the first artificial recombinant DNA
by Cohen and Boyer in 1972 was :
(a) E. coli (b) Salmonella typhimurium
(c) Agrobacterium tumefaciens (d) Bacillus thuringiensis

12. Who among the following challenged the patent right granted to the
University

(a) Mr. Ajay Phadke (b) Ms. Vandana Shiva
(c) Dr. Venugopalan (d) Dr. R.A. Mashelkar

For Questions number 13 to 16, two statements are given one labelled as
Assertion (A) and the other labelled as Reason (R). Select the correct answer to these
questions from the codes (a), (b), (c) and (d) as given below.

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the
correct explanation of the Assertion (A).

(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not
the correct explanation of the Assertion (A).

(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

13. Assertion (A) : A patient of ADA deficiency undergoing treatment for
gene therapy requires periodic infusion of genetically
engineered lymphocytes.
Reason (R) : Lymphocytes are immortal.

14. Assertion (A) : A cattle egret and grazing cattle in close association is a
classic example of commensalism.
Reason (R) : As grazing cattle move through the field, they stir up and
flush out insects from the vegetation that otherwise might
be difficult for egrets to find and catch.

57/1/1 JJJJ Page 13 P.T.O.

15. (A) : J¡a-Eoë~w{_Zg ~rOm| _| ^«yU {dH$mg Ho$ Xm¡amZ ^«yUnmof nyU©V: Cn^wº$ H$a
{b`m OmVm h¡ &
(R) : Aa§S>, _Q>a VWm go_ g^r J¡a-Eoë~w{_Zg ~rOm| Ho$ CXmhaU h¢ &

16. (A) : H$~yVa O¡go n{j`m| _| _mXm {df_`w½_H$s (hoQ>oamoJ¡_o{Q>H$) hmoVr h¡, O~{H$
Za g_`w½_H$s (hmo_moJ¡_o{Q>H$) hmoVo h¢ &
(R) : H$~yVa _|, _mXm _| Z VWm W qbJ H«$mo_mogmo_ nmE OmVo h¢, O~{H$ Za _|
ZZ qbJ H«$mo_mogmo_ hmoVo h¢ &

IÊS> I

17. ZrMo {XE JE {MÌ _| _mZd ^«yU Ho$ {dH$mg H$s EH$ AdñWm H$mo Xem©`m J`m h¡ & BgHo$
g§X^© _| {ZåZ{b{IV àíZm| Ho$ CÎma Xr{OE :

Y

X

(H$) {MÌ _| {XImB© JB© _mZd ^«yUr` AdñWm H$mo nhMmZ H$a CgH$m Zm_ {b{IE &

(I) EH$ _{hbm H$s gm_mÝ` J^m©dñWm _| BgH$s ghr AdpñW{V H$m CëboI H$s{OE &

(J) Zm_m§{H$V VWm Xmo ^mJm| _| go àË`oH$ H$m EH$-EH$ àH$m`© {b{IE & 2

18. (H$) nwîn Ho$ ~rOmÊS> Ho$ {H$g {gao go VWm {H$g àH$ma namJ Z{bH$m ^«yUH$mof
_| à{dîQ> hmoVr h¡ ?
(I) namJ Z{bH$m _| CnpñWV Za Ho$ÝÐH$ (Za `w½_H$m|) Ho$ ^{dî` H$m CëboI H$s{OE & 2

57/1/1 JJJJ Page 14

15. Assertion (A) : Endosperm is completely consumed during the
development of embryo in ex-albuminous seeds.
Reason (R) : Castor, pea and beans are all examples of ex-albuminous
seeds.

16. Assertion (A) : Birds like pigeon have heterogametic females whereas the
males are homogametic.
Reason (R) : In pigeons, females have Z and W sex chromosomes
whereas males have ZZ sex chromosomes.

SECTION B

17. The diagram given below shows a developmental stage of human embryo.
Answer the following questions with reference to it :

Y

X

(a) Identify and name the human embryonic stage shown.

(b) Mention its exact location in the normal pregnancy of a woman.

(c) Write one function of each of the . 2

18. (a) From which end of the ovule, and how does the pollen tube gain its
entry into the embryo sac of a Hibiscus flower ?

(b) State the fate of the male nuclei present in the pollen tube. 2

57/1/1 JJJJ Page 15 P.T.O.

19. (H$) (i) VWm g§aMZmAm| H$mo nhMmZ H$a CZHo$
Zm_ {b{IE :

(A)
(B)

(ii) O¡d-àm¡Úmo{JH$s Ho$ {d{^Þ à`moJm| _| CZHo$ _hÎd H$m CëboI H$s{OE & 2

AWdm
(I) Cg àH«$_ H$s ì`m»`m H$s{OE {OgHo$ Ûmam EH$ OrdmUw H$mo{eH$m H$mo BgHo$ n[adoe
go {dOmVr` S>rEZE H$mo àmßV H$aZo Ho$ {bE {Ûg§`moOr YZm`Z VWm Vmn àKmV
(CnMma) Ûmam gj_ ~Zm`m OmVm h¡ & 2

20. nm[apñW{VH$ {na¡{_S> (gyMr ñV§^) h_| nm[apñW{VH$ V§Ì Ho$ ~mao _| _hÎdnyU© gyMZmE± àXmZ
H$aVo h¢, naÝVw CZH$s ^r Hw$N> gr_mE± h¡§ & nm[apñW{VH$ {na¡{_S>m| H$s {H$Ýht Xmo gr_mAm| H$s
gyMr ~ZmBE & 2

21. Hw$b ^y{_ joÌ Ho$ {bhmO go ^maV {díd H$m gmVdm± g~go {demb Xoe h¡ & Bg_| ^maV Ho$
Ob VWm ñWb joÌ gpå_{bV h¢ & ^maV H$m ^y{_ joÌ {díd H$m {H$VZm à{VeV h¡ ? {\$a
{H$g H$maU go ^maV {díd Ho$ 12 _hm{d{dY Xoem| _| go EH$ h¡ ? CëboI H$s{OE & 2

IÊS> J
22. Ho$db `moOZmË_H$ AmaoI H$s ghm`Vm go, BH$mo Ama dZ (EcoRI) Am¡a S>rEZE bmBJoµO
à{V~§YZ H$s {H«$`m Ûmam nwZ`m}JO S>rEZE Ho$ {Z_m©U Ho$ VrZ MaUm| H$mo
Xem©BE & 3

57/1/1 JJJJ Page 16

19. (a) (i)
image given below :

(A)
(B)

(ii) State their importance in various biotechnology experiments. 2
OR

(b) Explain the process by which a bacterial cell can be made

divalent cations and temperature treatment. 2

20. Ecological pyramids give important information about the ecological
system, but do have some limitations. List any two limitations of
ecological pyramids. 2

21. India is the seventh largest country in the world in terms of total land
area including land and water. Write the value of the land area of our
country (in terms of percentage) of the world. Mention then, what makes
India one of the 12 mega diversity countries of the world. 2

SECTION C

22. With the help of a schematic diagram only, show in three steps,
the formation of recombinant DNA by the action of restriction
endonuclease EcoRI and DNA ligase. 3

57/1/1 JJJJ Page 17 P.T.O.

23. {MÌ _| {XE JE d§emdbr MmQ>© H$m AÜ``Z H$s{OE VWm g§~§{YV {ZåZ{b{IV àíZm| Ho$ CÎma
Xr{OE :
I OZH$

II

III

(H$) MmQ>© _| {XE JE {deofH$ à^mdr h¢ AWdm Aà^mdr ? AnZo CÎma Ho$ g_W©Z _|
H$maU Xr{OE &
(I) qbJ-ghb½Z ? AnZo CÎma Ho$ g_W©Z _| H$maU
Xr{OE &
(J) H$s g§V{V g§»`m VWm Ho$ g§^m{dV OrZmoQ>mBn {b{IE & 3

24. (H$) ñQ>o_ H$mo{eH$mAm| (_yb H$mo{eH$mAm|) Ho$ A{^bjU {b{IE &
(I) _mZdm| _| ñQ>o_ H$mo{eH$mAm| H$mo H$hm± go àmßV {H$`m Om gH$Vm h¡ ?
(J) _mZd amoJm| Ho$ CnMma _| ñQ>o_ H$mo{eH$mAm| Ho$ H$moB© Xmo AZwà`moJ {b{IE & 3

25. (H$) XþX©_ (_¡{b½Z¢Q>) A~w©X VWm gwX_ ({~ZmBZ) A~w©X _| {d^oX H$s{OE &
(I) XþX_© A~w©X Ho$ g~go S>amdZo JwU H$m Zm_ {bIH$a CgH$s ì`m»`m H$s{OE & 3

26. An{eîQ>/ì`W© Ob H$mo H$_ àXÿ{fV ~ZmZo Ho$ {bE CgH$m dm{hV _b CnMma g§`§Ì _|
CnMma {H$`m OmVm h¡ & Bg CnMma àH«$_ Ho$ g§X^© _| {ZåZ{b{IV H$s ì`m»`m H$s{OE : 3
(H$) àmW{_H$ Amn§H$ (ñbO)
(I) g{H«${`V Amn§H$
(J) Adm`dr` Amn§H$ g§nm{MÌ (EoZmamo{~H$ ñbO S>mBO¡ñQ>a)
27. (H$) AmYw{ZH$ `wJrZ _mZd (dV©_mZ `wJ Ho$ _mZd) Ho$ Eogo Xmo ZadmZaJU (àmB_oQ²>g)
nyd©Om| Ho$ Zm_ {b{IE Omo bJ^J 15 {_{b`Z df© nyd© {dÚ_mZ Wo &
(I) Ordmí_ gmú`m| Ho$ AZwgma {H$g g_`-H$mb _| Am¡a H$hm± ahVo
Wo ?
(J) VWm Ho$ ~rM Xmo A§Va {b{IE & 3

57/1/1 JJJJ Page 18

23. Study the given pedigree chart and answer the questions that follow.

Gen I (Parents)

Gen II

Gen III

(a) Is the trait given in the chart dominant or recessive ? Give reason in
support of your answer.
(b) Is this trait autosomal or sex-linked ? Give reason in support of
your answer.
(c) Write the possible genotypes of the children numbers
the second generation. 3

24. (a) .
(b) From where can one obtain in humans ?
(c) State any two applications of stem cells in curing human diseases. 3

25. (a) Differentiate between malignant and benign tumours.
(b) Name and explain the most feared property of a malignant tumour. 3

26. Treatment of wastewater is done in a sewage treatment plant to make it
less polluting. Explain the following with reference to this treatment
process : 3
(a) Primary sludge
(b) Activated sludge
(c) Anaerobic sludge digesters

27. (a) Name the two primate ancestors of the present day humans, who
existed approximately about 15 million years ago.
(b) According to geological records, when and where did
Australopithecines live ?
(c) Give two differences between Homo habilis and Homo erectus. 3

57/1/1 JJJJ Page 19 P.T.O.

28. (H$) (i) {d{^Þ àH$ma H$s ghm`H$ OZZ àm¡Úmo{J{H$`m| _| Cn`moJ H$s OmZo dmbr Hw$N>
VH$ZrH$m| Ho$ {ZåZ{b{IV g§{jßV ê$nm| H$m {dñVma H$s{OE : 2
(1) OoS>.AmB©.E\$.Q>r.
(2) AmB©.gr.Eg.AmB©.
(3) AmB©.`y.Q>r.
(4) Or.AmB©.E\$.Q>r.
(ii)Cn`w©º$ _| go {H$g VH$ZrH$ (VarHo$) H$mo nmÌo {ZfoMZ Zht _mZm Om gH$Vm ?
AnZo CÎma Ho$ g_W©Z _| H$maU {b{IE & 1
AWdm
(I) {ZåZ{b{IV _| {d^oX H$s{OE : 3
(i) n[a^«yUnmof VWm \$b{^{Îm
(ii) `wº$m§S>nr VWm {d`wº$m§S>nr ñÌrHo$ga
(iii) àm§Hw$a VWm _ybm§Hw$a

IÊS> K
29. EH$ H$mo{eH$m V§Ì _| OrZ AnZo Amn H$mo àmoQ>rZ/E§µOmB_ Ho$ ê$n _| A{^ì`º$ H$aVm h¡ & EH$
H$mo{eH$m V§Ì _| OrZ H$s A{^ì`{º$ H$~ Am¡a H¡$go g§ nÞ hmoZo H$s Amdí`H$Vm hmoVr h¡, VWm
EH$ Agr_Ho$ÝÐH$s H$mo{eH$m V§Ì _| OrZ H$s A{^ì`{º$ H$m {Z`_Z H¡$go hmoVm h¡, BgH$m
AÜ``Z O¡d- _moZm°S> VWm AmZwd§{eH$s{dk \
go {H$`m J`m & µO CnmnM` na CZHo$ Ûmam à{Vnm{XV àMmboH$
( Amonoam°Z) g§H$ënZm Ho$ {bE CÝh| 1965 _| Zmo~ob nwañH$ma go gå_m{ZV {H$`m J`m &
(H$) àMmboH$ ( Amonoam°Z ? 1
(I) H$hm OmVm h¡ {H$ OrdmUw H$mo{eH$m _| àMmboH$ H$s A{^ì`{º$ AË`{YH$
1
{ZåZ ñVa na {Za§Va ~Zr ahVr h¡ & H$WZ H$mo Ý`m`mo{MV {gÕ H$s{OE &
2
(J) àMmboH$ _| {Z`m_H$ OrZ H$mo i (AmB©)
1
OmVm h¡ ?
2
(K) OrdmUw Ho$ g§dY©Z _mÜ`_ _| àoaH$ H$s AZwnpñW{V _| àMmboH$ H$m `moOZmË_H$
AmaoI ~ZmBE & 2
AWdm
(K) OrdmUw Ho$ g§dY©Z _mÜ`_ _| àoaH$ H$s CnpñW{V _| àMmboH$ H$m `moOZmË_H$
AmaoI ~ZmBE & 2

57/1/1 JJJJ Page 20

28. (a) (i) Expand the abbreviations given below, used for different
modes of assisted reproductive technologies : 2
(1) ZIFT
(2) ICSI
(3) IUT
(4) GIFT
(ii) Which one of them cannot be considered as a procedure of
IVF ? Give reasons in support of your answer. 1
OR
(b) Differentiate between the following : 3
(i) Perisperm and Pericarp
(ii) Syncarpous pistil and Apocarpous pistil
(iii) Plumule and Radicle

SECTION D

29. Gene expresses itself in a cell system as a protein/enzyme. How does an
expression of gene occur in a cell system and when does it need to
occur, and how the gene expression is regulated in a prokaryote cell
system was studied by the combined efforts of Jacque Monod, the
biochemist and Francois Jacob, the geneticist. For their work on lactose
metabolism in E. coli a lac they
were awarded the Nobel Prize in 1965.

(a) Why is lac operon said to be a transcriptionally regulated system ? 1

(b) It is said that the lac operon has to be operational at a very low level
1
in the bacterial cell all the time. Justify.
2
1
(c) Why is the regulator gene in lac ?
2
(d) Draw a schematic diagram of lac operon in absence of inducer in the
culture medium of the bacteria. 2
OR
(d) Draw a schematic diagram of lac operon in the presence of inducer in
the culture medium of the bacteria. 2

57/1/1 JJJJ Page 21 P.T.O.

30. ZrMo {XE JE AmaoI _| n¥Ïdr Ho$ joÌm| H$m {MÌmË_H$ {Zê$nU {X`m J`m h¡ {Og_| H«$_e:
VWm Ûmam & Bg {MÌmË_H$ {Zê$nU H$m AÜ``Z H$aHo$
{ZåZ{b{IV àíZm| Ho$ CÎma Xr{OE &

^y_Ü`aoIm

(H$) O~ joÌ go joÌ H$s Amoa OmVo h¢, Vmo Om{V {d{dYVm na AnZo àojU {b{IE
VWm Xmo H$maU ^r {b{IE & 3
(I) H$maU ~VmVo hþE ^maV _| nmE OmZo dmbo n{j`m| H$s àOm{V`m| H$s AZw_m{ZV g§»`m
H$m CëboI H$s{OE & 1
AWdm
(I) {díd Ho$ Cg joÌ H$m Zm_ {b{IE Ohm± gdm©{YH$ O¡d-{d{dYVm A§{H$V H$s JB© h¡
`m| h¡ & 1
IÊS> L>
31. (H$) S>rEZE à{VH¥${V`Z Ho$ VarHo$ H$s nw{îQ> Ho$ {bE _ogoëgZ d ñQ>mb Zo EH$ à`moJ
{H$`m & Cg à`moJ H$m ñ_aU H$s{OE VWm {ZåZ{b{IV àíZm| Ho$ CÎma Xr{OE &
(i) CÝhmo§Zo AnZo à`moJm| _| ZmBQ´>moOZ Ho$ {H$Z Xmo ê$nm| H$m Cn`moJ {H$`m Am¡a
?
(ii) AnZo àojU hoVw CÝhm§oZo
{bE ?
(iii) Bg à`moJ _| gr{µO`_ KZËd J«o{S>E|Q> H$s ^y{_H$m H$m CëboI
H$s{OE &
(iv) CZHo$ Ûmam {ZH$mbo JE {ZîH$f© {b{IE & 5
AWdm
57/1/1 JJJJ Page 22

30. Study the diagrammatic representation given below of the Earth with
s that follow.

EQUATOR

(a) Write the observations made regarding the species diversity when
moving . Give two reasons also. 3
(b) Stating the reason, mention the approximate number of bird species
recorded in India. 1
OR
(b) Name the region in the world that records the greatest biodiversity
and mention why. 1

SECTION E

31. (a) Meselson and Stahl carried out an experiment to prove the nature of
DNA replication. Recall the experiment and answer the following
questions.
(i) Which two types of nitrogen were used by them in their
experiment and why ?
(ii) Why did they take samples of E. coli at definite time intervals
for their observation ?
(iii) State the role of caesium chloride density gradient in their
experiment.
(iv) Write the conclusions they arrived at. 5
OR
57/1/1 JJJJ Page 23 P.T.O.

(I) (i) EH$ VÐÿn-àOZZ g_ _Q>a Ho$ Jmob ~rO dmbo b§~o nm¡Yo H$m _Q>a Ho$ ~m¡Zo
PwauXma ~rO dmbo nm¡Yo Ho$ gmW g§H$aU H$am`m J`m & Bg H«$m°g H$m F2
VH$ {MÌU H$s{OE {Og_| H«$_e: F1 VWm F2 \$sZmoQ>mBn
(Ñí`àê$n) AZwnmV H$mo Xem©`m J`m hmo &
(ii) _|S>b Ho$ Cg {Z`_ H$mo {b{IE {Ogo Ho$db Bg àH$ma Ho$ H«$m°g Ho$ AmYma
na à{Vnm{XV {H$`m Om gH$Vm h¡ & 5

32. (H$) 10 df© H$s Am`w H$m hmoZo VH$ EH$
g_`~Õ Q>rH$mH$aU H$m`©H«$_ (àmoJ«m_) H$m {Zd©hZ {H$`m OmVm h¡ & ZrMo ~ZmE JE
J«m\$ _| Q>rH$mH$aU Ho$ à^md H$mo Xem©`m J`m h¡ & Bg_| Q>rH$mH$aU Ho$ Cnam§V Cgr

J`m h¡ &
aº$ _| à{Vajr AUwAm| H$s gmÐVm

.
Q>rH$mH$aU `hm± {H$`m J`m

Q>rH$mH$aU Ho$ níMmV² g_` ({XZm| _|)

(i) ?
ì`m»`m H$s{OE &

57/1/1 JJJJ Page 24

(b) (i) A true breeding tall pea plant with round seeds is crossed with
a recessive dwarf pea plant having wrinkled seeds. Work out
the cross up to F2 generation giving the phenotypic ratios of
F1 and F2 generation respectively.

(ii) State the Mendelian principle that can be derived only with the
help of such a cross. 5

32. (a) A time-bound vaccination programme is followed for the children in
our country from their birth up to ten years of age. A graph plotted
below shows the effect of the vaccination followed by infection by the
same pathogen, and the antibody concentration in the blood of the
child.
Antibody concentration in Blood
Vaccine is administered here

Reinfection with same pathogen

Days after administration of vaccine

(i) Explain why the administration of a vaccine causes an
increase in the antibody concentration.

57/1/1 JJJJ Page 25 P.T.O.

(ii) H$mo Cgr amoJOZH$ H$m g§H«$_U hmo OmVm h¡, Vmo
aº$ _| à{Vajr AUwAm| H$s gmÝÐVm ~hþV Vrd«Vm go
H$s{OE {H$ &
(iii) ZrMo Xr JB© Vm{bH$m go {d{^Þ àH$ma H$s à{Vajm VWm dh H¡$go àmßV hmoVr
h¢, Ho$ {df` _| gyMZm àmßV hmoVr h¡ & Vm{bH$m _| A§{H$V
VWm H$s nhMmZ H$s{OE & 5

ñ_¥{V
à{Vajm AUwAm|
à{Vajm Ho$ àH$ma H$mo{eH$mAm| àm{ßV H$m VarH$m
H$m CËnmXZ
H$s CnpñW{V
(1) àmH¥${VH$, g{H«$` hm±
J^m©dñWm/Xþ½Y
òdU Ho$ Xm¡amZ
(2) àmH¥${VH$, {Z{îH«$` Zht
Anam Ho$
Ama-nma
Xþ½Y òdU Ho$
(3) Cnm{O©V, g{H«$` hm± Xm¡amZ Q>rH$m

à{Vajm AUwAm|
(4) Cnm{O©V, {Z{îH«$` Zht H$m {ZdoeZ

AWdm
(I) (i) ñ_¡H$ ? ñ_¡H$ boZo H$mo Hw$à`moJ AWdm ì`gZ
?

(ii) {ZåZ{b{IV S´>J Ho$ òmoV nm¡Yo H$m Zm_ {bIH$a _mZd eara na àË`oH$ S´>J
H$m EH$-EH$ à^md ^r {b{IE :
(1) _¡[aOwAmZm
(2) H$moHo$Z
(3) _m°µ\$s©Z 5

57/1/1 JJJJ Page 26

(ii) If the child is infected with the same pathogen almost four
months later, the antibody concentration in his/her blood
increases very fast. Explain why.

(iii) A table given below gives information about different types of
immunity and how they are attained. Identify P , Q , R , S
and T in the table. 5
Presence
Type of Production
of memory Mode attained
immunity of antibodies
cells
(1) Natural, Yes
active
(2) Natural, No Across the
passive placenta during
pregnancy/breast
feeding
(3) Acquired, Yes Getting a vaccine
active during breast
feeding
(4) Acquired, No Getting an
passive injection of
antibodies

OR

(b) (i) ? Why is the consumption
of smack considered as an abuse ?

(ii) Name the source plant and one effect of the following drugs on
the human body :

(1) Marijuana

(2) Cocaine

(3) Morphine 5

57/1/1 JJJJ Page 27 P.T.O.

33. (H$) ZrMo {XE JE AmaoIm| _| namJU Ho$ VarH$m| H$mo Xem©`m J`m h¡ & Bggo g§~§{YV {XE
JE àíZm| Ho$ CÎma Xr{OE :

2 3
1

(i) Cn`w©º$ {MÌ _| nm¡Ym| _| namJH$Um| Ho$ ñWmZm§VaU H$s VrZ {d{Y`m| H$mo Xem©`m
J`m h¡ & Bg_| Xem©B© JB© VWm {d{Y`m| Ho$ {bE Cn`moJ {H$E OmZo
dmbo VH$ZrH$s eãX (nm[a^m{fH$ ?

(ii) {ZåZ{b{IV nm¡Yo g\ ?

(1) dmQ>a {bbr

(2)

(iii) AÝV:àOZZ AdZ_Z H$mo hVmoËgm{hV H$aZo Ho$ {bE nwînr` nmXnm| Zo AZoH$
`w{º$`m± {dH${gV H$a br h¢ & Bg CÔoí` H$s àm{ßV Ho$ {bE nm¡Ym| Ho$ ghm`H$
EH$ d§emZwJV VWm EH$ H$m{`©H$s` `w{º$ H$s ì`m»`m H$s{OE & 5

AWdm
57/1/1 JJJJ Page 28

33. (a) Study the diagram given below showing the modes of pollination.
Answer the questions that follow.

2 3
1

(i) The given diagram shows three methods of pollen transfer in
plants. What are the technical terms used for pollen transfer
methods ?

(ii) How do the following plants achieve pollination successfully ?

(1) Water lily

(2) Vallisneria

(iii) Flowering plants have developed many devices to avoid
inbreeding depression. Explain one hereditary and one
physiological device which helps plants to achieve this target. 5

OR
57/1/1 JJJJ Page 29 P.T.O.

(I) EH$ gm_mÝ` _mZd ñÌr Ho$ AmV©d MH«$ H$mo {ZåZ {MÌ Ûmam Xem©`m J`m h¡ & BgH$m
àojU H$aHo$ {XE JE g§~§{YV àíZm| Ho$ CÎma Xr{OE :

A§{H$V g§»`mE± AmV©d MH«$ Ho$ {Xdgm| H$mo B§{JV H$aVr h¢

(i) {ZåZ{b{IV Ho$ {bE g_w{MV nm[a^m{fH$ ?

(1) {Xdg 1 7

(2) {Xdg 8 12

(3) {Xdg 16 28

(4) {Xdg 13 15

(ii) {ZåZ{b{IV Ad{Y _| A§S>me`r hm°_m}Z VWm nr`yfJ«§{W hm°_m}Z H$s ^y{_H$m
H$s ì`m»`m H$s{OE :
(1) {Xdg 8 12

(2) {Xdg 13 15

(3) {Xdg 16 28 5

57/1/1 JJJJ Page 30

(b) Observe the diagram given below showing the menstrual cycle of a
normal human female and answer the questions that follow :

Numbers indicate the days of the menstrual cycle

(i) What are the suitable technical terms used for the following ?

(1) Days 1 7
(2) Days 8 12

(3) Days 16 28
(4) Days 13 15

(ii) Explain the role of ovarian and pituitary hormones during the
following time periods :

(1) Days 8 12
(2) Days 13 15

(3) Days 16 28 5

57/1/1 JJJJ Page 31 P.T.O.