TN 12th Question Paper 2023 Zoology

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 11
6637
£vÄ Gs
A Register Number

!6637Zoology! PART - III
»[Q¯À / ZOOLOGY
( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 70
Time Allowed : 3.00 Hours ] [ Maximum Marks : 70

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
öPõÒÍÄ®. Aa_¨£vÂÀ SøÓ°¸¨¤ß AøÓ PsPõo¨£õÍ›h®
EhÚi¯õP öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ ©mk÷© GÊxÁuØS®
AiU÷PõikÁuØS® £¯ß£kzu ÷Ásk®. £h[PÒ ÁøµÁuØS
ö£ß]À £¯ß£kzuÄ®.

Instructions : (1) Check the question paper for fairness of printing. If there is any lack of
fairness, inform the Hall Supervisor immediately.

(2) Use Blue or Black ink to write and underline and pencil to draw
diagrams.

£Sv & I / PART - I
SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 15x1=15

(ii) öPõkUP¨£mkÒÍ ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯ Âøhø¯z
÷uº¢öukzxU SÔ±mkhß Âøh°øÚ²® ÷\ºzx GÊuÄ®.
Note : (i) Answer all the questions.

(ii) Choose the most appropriate answer from the given four alternatives

and write the option code and the corresponding answer.

[ v¸¨¦P / Turn over

6637 2

1. ]ØÔÚ[PÐUQøh÷¯ ÷£õmi Põµn©õP HØ£kÁx :

(A) öuõ¢uµÄ ÁõÌUøP (B) E°›Ú ©øÓÄ

(C) Tmk°› ÁõÌUøP (D) vjº©õØÓ®
Competition between species leads to :

(a) Amensalism (b) Extinction

(c) Symbiosis (d) Mutation

2. Cµzu öPõ»ìmµõÀ AÍøÁU SøÓUP¨ £¯ß£kzu¨£kÁx :

(A) ì÷hmißPÒ (B) Pmi ]øu¨£õß

(C) öhmµõø\UÎß (D) ø\U÷Íõì÷£õ›ß A
__________ is used to lower blood cholesterol level.

(a) Statins (b) Clot buster

(c) Tetracycline (d) Cyclosporin A

3. RÌÁ¸ÁÚÁØÖÒ P¸U÷PõÍ©õUPzøu¨ £ØÔ¯ Esø©¯õÚ TØÖ Gx ?

(A) KµkUS P¸U÷PõÍ® ‰ÁkUS P¸U÷PõÍ©õP ©õÖ® {PÌa]

(B) P¸ÄØÓ •møh°¼¸¢x £»ö\À{ø» E¸ÁõuÀ

(C) P¸U÷PõÍ® P¸¨ø£°ß _Á¸hß JmiUöPõÒÐuÀ

(D) ‰» CÚaö\À AkUSPμ¸¢x SÔ¨¤mh EÖ¨¦PÒ ÷uõßÖuÀ
Which one of the following is true to gastrulation ?

(a) Formation of three germ layer embryo from single layer embryo.

(b) Formation of multicellular structure from zygote.

(c) Attachment of blastocyst to the uterine wall.

(d) Formation of specific organs from Primary germ layers.

A

3 6637

4. RÌUPõq® SÔ±kPÎÀ G¢u SÔ±k ö©zv÷¯õÛøÚU SÔ±k ö\´QÓx ?

(A) UUU (B) AUG

(C) AUC (D) UAA
Which of the following Codon codes for methionine ?

(a) UUU (b) AUG

(c) AUC (d) UAA

5. ZW-ZZ ÁøP £õÀ {ºn¯® Põn¨£kÁx :

(A) FºÁÚ (B) £ÓøÁPÒ

(C) «ßPÒ (D) ÷©ØPsh AøÚzx®
ZW-ZZ system of sex determination occurs in :

(a) Reptiles (b) Birds

(c) Fishes (d) All of the above

6. FºÁÚ CÚzvß ö£õØPõ»® :

(A) ÷£¼÷¯õ÷\õ°U ö£¸[Põ»®

(B) «÷\õ÷\õ°U ö£¸[Põ»®

(C) ¦÷µõmi÷µõ÷\õ°U ö£¸[Põ»®

(D) ^÷Úõ÷\õ°U ö£¸[Põ»®
The golden age of reptiles was :

(a) Paleozoic era

(b) Mesozoic era

(c) Proterozoic era

(d) Cenozoic era

A [ v¸¨¦P / Turn over

6637 4

7. •uß•u»õP ©ÛuøÚ¨ ÷£õ»z ÷uõØÓ©ÎzuøÁ :

(A) µõ©õ¤zvPì (B) ÷íõ÷©õ GµUhì

(C) ÷íõªÛmPÒ (D) Bìmµ÷»õ¤zvPì

__________ was the first human like being.

(a) Ramapithecus (b) Homo erectus

(c) Hominids (d) Australopithecus

8. |ßÜ›¼¸¢x PhÀ}¸US |P¸® »[QÚ[PÒ :

(A) Pmhõmµõ©ì (B) ìj÷Úõöuº©À

(C) AÚõmµõ©ì (D) ³›öuº©À

Animals that can move from Fresh water to Sea water :

(a) Catadromous (b) Stenothermal

(c) Anadromous (d) Eurythermal

9. •uÀ ¢x vµÁ öÁÎ÷¯ØÓzvØS __________ GßÖ ö£¯º.

(A) BºUQöhUhª (B) ©»mkzußø©

(C) ìö£º©õºUQ (D) A`ìö£ºª¯õ

The first ejaculation of the semen is __________.

(a) Orchidectomy (b) Infertility

(c) Spermarche (d) Azoospermia

A

5 6637

10. ¤Íõì÷©õi¯zvß ¦Óa]Á¨£q ø\÷åõ÷PõÛ |øhö£Ö® Ch® :

(A) Cøµ¨ø£ (B) Cµzu ]Á¨£q

(C) PÀ½µÀ (D) ¼³U÷Põø\mkPÒ

Exo-erythrocytic schizogony of Plasmodium takes place in :

(a) Stomach (b) RBC

(c) Liver (d) Leucocytes

11. Bs£õÀ íõº÷©õÚõÚ öhì÷hõìj÷µõß _µUS® Ch® :

(A) ¢uP ÷©À _¸ÒSÇÀ (B) ö\º÷hõ¼ ö\ÀPÒ

(C) ¦÷µõì÷hm _µ¨¤ (D) ½iU ö\À

The male sex hormone testosterone is secreted from :

(a) Epididymis (b) Sertoli cells

(c) Prostate gland (d) Leydig cell

12. ÷hõ÷hõ, £¯oPÒ ¦Óõ, ìöhÀ»›ß PhÀ £_ BQ¯ÁØÔß AÈÂØS Põµn®
__________ .

(A) ÁõÈh CǨ¦ (B) ªøP £¯ß£õk

(C) Ch® ©õÖ® ÷ÁÍõsø© (D) ÁõÈh[PÒ xshõh¨£kuÀ

Dodo, Passenger pigeon and Steller’s sea cow have become extinct due to
__________.

(a) Habitat Loss (b) Over exploitation

(c) Shifting cultivation (d) Habitat fragmentation

A [ v¸¨¦P / Turn over

6637 6

13. JÆÁõø©²hß öuõhº¦øh¯x :

(A) IgA (B) IgE

(C) IgM (D) IgG
Allergy involves :

(a) IgA (b) IgE

(c) IgM (d) IgG

14. }º EnÄa \[Q¼°À AvP£m\ DDT ö\ÔÄ Põn¨£kÁx :

(A) ö\À

(B) PhØ£ÓøÁ («ßPøÍ Esq® £ÓøÁPÒ)

(C) uõÁµ ªuøÁ E°›PÒ

(D) |sk
The highest DDT concentration in aquatic food chain shall occur in :

(a) Cell

(b) Seagull (Fish eating birds)

(c) Phytoplankton

(d) Crab

15. £õUj›¯õÂÀ £õÀ CÚ¨ö£¸UP® |øhö£Ö® •øÓ :

(A) CønuÀ (B) ÷Pªm E¸ÁõUP®

(C) `ì÷£õº E¸ÁõUP® (D) Gs÷hõì÷£õº E¸ÁõUP®
The mode of sexual reproduction in bacteria is by :

(a) Conjugation (b) Formation of gametes

(c) Zoospore formation (d) Endospore formation

A

7 6637

£Sv & II / PART - II

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 24 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x2=12

Note : Answer any six of the following. Question No. 24 is Compulsory.

16. ¤Íõì÷©õ÷hõª GßÓõÀ GßÚ ?
What is Plasmotomy ?

17. ìö£ºª÷¯õöáÛ]ì ©ØÖ® ìö£º©m÷hõöáÛ]ì – ÷ÁÖ£kzxP.
Differentiate spermiogenesis and spermatogenesis.

18. ÷©¯º ÷µõQhõßìQ SøÓ£õk GßÓõÀ GßÚ ?
What is Mayer-Rokitansky Syndrome ?

19. ø»÷¯õøÚ÷\åß GßÓõÀ GßÚ ?
What is Lyonisation ?

20. KPõ\õQ xsh[PÒ GßÓõÀ GßÚ ?
What are Okazaki fragments ?

21. E°›¯z wºÄ GßÓõÀ GßÚ ?

What is bio-remediation ?

A [ v¸¨¦P / Turn over

6637 8

22. ""ö\¢uµÄ¨ ¦zuP®'' – Cøu¨ £ØÔ EÚUS öu›Áx GßÚ ?
“Red data book” - What do you know about it ?

23. ªøP EnÅmh® – Áøµ¯ÖUPÄ®.
Define Eutrophication.

24. ]ßÚ®ø© ÷|õ´US GvµõP uk¨§] u¯õ›UP¨£hÂÀø». Hß ?
Vaccine is not produced against Chickenpox. Why ?

£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 33 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x3=18

Note : Answer any six of the following. Question No. 33 is Compulsory.

25. CÍÄ°›{ø» GÆÁõÖ CÚ¨ö£¸UP {ø»°¼¸¢x ÷ÁÖ£mkÒÍx ?
How does juvenile phase differ from reproductive phase ?

26. •vº¢u ¢uqÂß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw a labeled sketch of a spermatozoan.

27. P¸USÇÀ uøh ©ØÖ® ¢xSÇÀ uøh – ÷ÁÖ£kzxP.
Differentiate tubectomy and vasectomy.

A

9 6637

28. vjº©õØÓU ÷Põm£õmiß ]Ó¨¦¨ £s¦PøÍ GÊxP.

Write the salient features of Mutation theory.

29. C®²÷ÚõS÷Íõ¦¼Ûß £oPÒ ¯õøÁ ?

What are the functions of immunoglobulin ?

30. ö|õvP»ßPÒ – Áøµ¯ÖUPÄ®.

Define Fermentors.

31. PCR &ß JÆöÁõ¸ _ØÔ¾® GzuøÚ •ß÷ÚõiPÒ ÷uøÁ¨£kQßÓÚ ? PCR &À
•ß÷Úõi ©ØÖ® i.Gß.H. £õ¼©÷µêß £[S ¯õx ? PCR _ØÔÀ £¯ß£kzu¨&
£k® i.Gß.H. £õ¼©÷µì G¢u E°›Ú ‰»zv¼¸¢x ö£Ó¨£kQßÓx ?

Mention the number of primers required in each cycle of PCR. Write the role of
primers and DNA Polymerase in PCR. Name the source organism of the DNA
Polymerase used in PCR.

32. ¤Ó¨¦ Ãu® ©ØÖ® CÓ¨¦ Ãu® – ÷ÁÖ£kzxP.

Differentiate Natality and Mortality.

33. G´mì J¸ ÷|õ´ AÀ». BÚõÀ Ax ©ØÓ E°›Ú[PÒ uõUSÁuØS EuÂ
¦›QÓx. Hß ?

AIDS is not a disease. But it facilitates the attack by other organisms. Why ?

A [ v¸¨¦P / Turn over

6637 10

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer all the questions.

34. (A) ©õuÂhõ´ _ÇØ]°ß £À÷ÁÖ {ø»PøÍ ÂÍUSP.
AÀ»x
(B) ©»mkzußø© GßÓõÀ GßÚ ? ©»mkzußø©UPõÚ Põµn[PøÍ GÊxP.
(a) Explain the various phases of the menstrual cycle.
OR
(b) What is infertility ? Write its causes.

35. (A) ©Ûu ©µ£qz vmhzvß ]Ó¨¤¯À¦PøÍ GÊxP.
AÀ»x
(B) hõºÂÛß S¸ÂPÒ ©ØÖ® Bìv÷µ¼¯ ø£¨£õ¿miPÒ BQ¯øÁ
uPÁø©¨¦¨ £µÁ¾UPõÚ ]Ó¢u GkzxUPõmkPÒ BS®. Caö\õØöÓõhøµ
{¯õ¯¨£kzxP.
(a) Write the salient features of Human Genome Project (HGP).
OR
(b) Darwin’s finches and Australian marsupials are suitable examples of adaptive
radiation - Justify the statement.

36. (A) |»•hß ÁõÇ ÷©ØöPõÒÍ ÷Ási¯ ÁõÌUøP •øÓ ©õØÓ[PÒ ¯õøÁ ?
AÀ»x
(B) •uÀ{ø» ©ØÖ® Cµshõ® {ø» uøhPõ¨¦ x»[PÀPÐUQøh÷¯¯õÚ
÷ÁÖ£õkPøÍ GÊxP.
(a) What are the steps to be adopted to lead healthy life style ?

OR
(b) Write the differences between primary and secondary immune responses.

A

11 6637

37. (A) »[S |P»õUPzvß |ßø©PÒ ©ØÖ® wø©PÒ ¯õøÁ ?

AÀ»x

(B) CÚUTmh¨ £µÁÀ GßÓõÀ GßÚ ? Auß ÁøPPøÍ ÂÍUSP.
(a) What are the advantages and disadvantages of cloning ?

OR

(b) What is population dispersion ? Explain its types.

38. (A) E°›¯ £ÀÁøPzußø© £õxPõ¨¤ß ö£õxÁõÚ EzvPÒ ¯õøÁ ?
AÀ»x
(B) PÈÄ}º _zvP›¨¤ß {ø»PøÍ ÂÍUSP.
(a) Write the general strategies in conservation.
OR
(b) Explain the process of sewage treatment.

-oOo-

A [ v¸¨¦P / Turn over