TN 12th Question Paper 2026 Zoology

FOR TN 12TH EXAM PREPARATION

TN 12th 2026
Question Paper ·
Zoology
EXAM YEAR TYPE SUBJECT

TN 12th 2026 Question Paper Zoology

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 11
9037
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!9037Zoology! PART - III
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Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 70

Time Allowed : 3.00 Hours ] [ Maximum Marks : 70

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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.

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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.

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9037 2

1. GÆÁøPU PßÛ CÚ¨ö£¸UPzvÀ Bs E°›PÒ ©mk÷© E¸ÁõQßÓÚ ?
(A) AºŸ÷Úõ÷hõUQ (B) öu¼÷hõUQ
(C) B®L¤÷hõUQ (D) (A) ©ØÖ® (C) Cµsk®
In which type of Parthenogenesis are only males produced ?

(a) Arrhenotoky (b) Thelytoky

(c) Amphitoky (d) Both (a) and (c)

2. TØÖ : AÖøÁ ]Qaø\ ‰»® ¢uP[PøÍ }USuÀ (AÀ»x) Bs ©»hõUP®
I

"BºUQöhUhª' GÚ¨£k®.
TØÖ : CuÚõÀ ]Ö}ºPÈzuÀ PiÚ©õQÓx.
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(A) TØÖ ©ØÖ® TØÖ Cµsk® uÁÖ.
I II

(B) TØÖ ©ØÖ® TØÖ Cµsk® \›.
I II

(C) TØÖ uÁÖ BÚõÀ TØÖ \›.
I II

(D) TØÖ \› BÚõÀ TØÖ uÁÖ.
I II

Statement I : Castration (or) surgical removal of testis is known as Orchidectomy.

Statement II : It leads to difficulty in urination.

(a) Statement I and Statement II are not correct.

(b) Statement I and II are correct.

(c) Statement I is not correct and Statement II is correct.

(d) Statement I is correct and Statement II is not correct.

3. RÌÁ¸ÁÚÁØÖÒ íõº÷©õß P¸zuøh ©õzvøµPÎß ö\¯ÀPÒ £ØÔ¯ uÁÓõÚ
TØøÓz ÷uº¢öukUP.
(A) P¸¨ø£Áõ´ ÷PõøÇ°ß ußø© ©õØÓzuõÀ ¢xö\À ~øDz® £õøu
©ØÖ® ¢xö\À |PºÁøu £»ÃÚ¨£kzxQßÓx.
(B) ¢x ö\À»õUPzøu uøh ö\´uÀ
(C) P¸¨ø£ Em÷PõøǨ £h»zvÀ HØ£k® ©õØÓ® P¸¨£vÂØS GvµõÚ
`Çø» HØ£kzxQßÓx.
(D) Ash öÁΨ£õmøh uøh ö\´uÀ
Select the incorrect action of hormonal contraceptive pills from the following.

(a) Changes in cervical mucus impairing its ability to allow passage and transport of sperms

(b) Inhibition of spermatogenesis

(c) Alteration in uterine endometrium to make it unsuitable for implantation

(d) Inhibition of ovulation

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4. C¢u ©µ¦U SÔ±k GøuU SÔUQÓx ?

(A) Bs
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(D) CµmøhUS

This pedigree symbol represents :

(a) Male

(b) Monozygotic twins

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(c) Mating

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(d) Dizygotic twins
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(B) ¦µu®, £õUj›¯õ ö\À¾USÒ ~øÇQÓx
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las Hershey and Chase’s experiment with bacteriophage showed that :
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(b) Protein gets into the bacterial cells .

(c) Viruses undergo transformation.

(d) DNA is the genetic material.

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9037 4

6. uÁÓõP ö£õ¸¢v²ÒÍÁØøÓ ÷uº¢öuk.
(A) &S÷µõ÷©õ÷\õ®
Y & 231 ©µ£qUPÒ
(B) &Áx S÷µõ÷©õ÷\õ®
1 & 2968 ©µ£qUPÒ
(C) iìm÷µõL¤ß & 2.4 ªÀ¼¯ß Põµ ‰»[PÒ
(D) ©Ûu ã÷Úõ® & 300 Põµ ‰»[PÒ
Find out the wrongly matched pair.

(a) Y-chromosome - 231 genes

(b) Chromosome-1 - 2968 genes

(c) Dystrophin - 2.4 million bases

(d) Human genome - 300 bases

7. £ÓøÁPÒ ©ØÖ® Ásnzx¨ §a]PÎß CÓUøPPÒ RÌUPsh GuØS
GkzxUPõmkPÍõS® ?
(A) › £›nõ©® (B) £µÁÀ •øÓ uPÁø©¨¦
(C) ©õÖ£õkPÒ (D) SÂ £›nõ©®
The wings of birds and butterflies is an example of :

(a) Divergent evolution (b) Adaptive radiation

(c) Variation (d) Convergent evolution

8. uk¨§]PøÍ £¯ß£kzv¯uõ¾®, ©UPÎøh÷¯ ÂȨ¦nºøÁ
HØ£kzv¯uõ¾® Pmk¨£kzu¨£mh ÷|õ´PÎß SÊøÁU PshÔP.
(A) ö£›¯®ø©, A«¤¯õ]ì, i¨w›¯õ, öhmhÚì
(B) ö£›¯®ø©, CÍ®¤ÒøÍÁõu®, i¨w›¯õ, öhmhÚì
(C) ö£›¯®ø©, G´mì, i¨w›¯õ, öhmhÚì
(D) ö£›¯®ø©, \õuõµn \Î, i¨w›¯õ, öhmhÚì
Which of the following groups of diseases have been controlled by the use of vaccines and by

creating awareness among the people ?

(a) Small pox, amoebiasis, diphtheria, tetanus.

(b) Small pox, polio, diphtheria, tetanus.

(c) Small pox, AIDS, diphtheria, tetanus.

(d) Small pox, common cold, diphtheria, tetanus.

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9. JÆÁõø©°À öuõhº¦øh¯x :
(A) IgA (B) IgE (C) IgM (D) IgG

Allergy involves :

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(a) IgA (b) IgE (c) IgM (d) IgG

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(C) ÷\õÍ EnÄ (D) {»UPhø»
The most common substrate used in distilleries for the production of ethanol is __________.

(a) Molasses (b) Soya meal

(c) Corn meal (d) Groundgram

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11. TØÖ (A) : C¯ØøP°À £» E°›Ú[PÒ |P»õUP® GÝ® £õ¼¼ CÚ¨

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Põµn® (R) :

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(A) TØÖ ©ØÖ® Põµn® Cµsk®
(B) TØÖ \› BÚõÀ Põµn® uÁÖ.
(C) TØÖ ©ØÖ® Põµn® \› BÚõÀ TØÖ PõµnzvØS \›¯õP
ö£õ¸¢uÂÀø».
(D) TØÖ ©ØÖ® Põµn® Cµsk® \›, TØÖ PõµnzvØS \›¯õP
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Assertion (A) : In nature many organisms produce clones through asexual reproduction.

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Reason (R) : By this process, genetically identical individuals are produced.

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(b) Assertion is true, but Reason is false.

(c) Both Assertion and Reason are true but Reason is not the correct explanation of

Assertion.

(d) Both Assertion and Reason are true and Reason explains Assertion correctly.

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9037 6

12. EÔg_«ÝUS® _Óõ«ÝUS® EÒÍ öuõhº¦ :
(A) ÷Ámøh¯õk® ÁõÌUøP (B) ÷£õmi
(C) Jmkso ÁõÌUøP (D) EuÂö£Ö® ÁõÌUøP
The relationship between sucker fish and shark is __________.

(a) Predation (b) Competition

(c) Parasitism (d) Commensalism

13. "]ÖÁõÈh®' GßÓ ö\õÀø» •uß •u¼À £¯ß£kzv¯Áº :
(A) áõß ÷µ (B) \õº»ì hõºÂß
(C) ÷áõºhõß (D) \õº»ì GÀhß
The term “Niche” was first used by __________.

(a) John Ray (b) Charles Darwin

(c) Jordon (d) Charles Elton

14. ÁõÈh ^µÈÂÚõÀ ªP Pkø©¯õÚ £õv¨¦PÐUS EÒÍõQ AȲ® {ø»°À
EÒÍ Â»[QÚ® Gx ?
(A) C¸ÁõÌÂPÒ (B) £õ¿miPÒ
(C) •m÷uõ¼PÒ (D) £ÓøÁPÒ
Which one of the following are at higher risk of extinction due to habitat destruction ?

(a) Amphibians (b) Mammals

(c) Echinoderms (d) Birds

15. __________ J¸ ]Ó¢u öuõØÖ }UQ¯õP PÈÄ}º _zvP›¨¤À £¯ß£kzu¨£kQÓx.
(A) öPõvUP øÁzuÀ (B) ¦Ó FuõU PvºPÒ
(C) K÷\õß ÷\ºzuÀ (D) S÷Íõ›ß CkuÀ
__________ is/are an ideal disinfectant for waste water.

(a) Boiling (b) U-V Rays

(c) Ozonisation (d) Chlorination

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£Sv & II / PART - II

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 24 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x2=12
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Note : Answer any six questions. Question No. 24 is Compulsory.

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Define gametogenesis.

17. Cßî¤ß GßÓõÀ GßÚ ?
What is inhibin ?

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18. •ußø© CøÇ ¤ßu[S CøÇ & ÷ÁÖ£kzxP.
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Differentiate - Leading strand and Lagging strand.

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¯õøÁ ?
How does Neanderthal man differ from the Modern man in appearance ?

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20. •x©µ¦ «m] GßÓõÀ GßÚ ?

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What is Atavism ?

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Draw the structure of Lymph node and label the parts.

22. ø\©õ»â & Áøµ¯ÖUPÄ®.
Define : Zymology

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9037 8

23. ÷Põøh EÓUP® ©ØÖ® Sκ EÓUP® BQ¯ {PÌa]PøÍ ÷ÁÖ£kzxP.
Differentiate hibernation and aestivation.

24. £_ø© CÀ» ÂøÍøÁ HØ£kzx® Áõ²UPÒ ¯õøÁ ?
What are the gases that cause the Green House Effect ?

£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 questions. Question No. 33 is Compulsory.

25. ì£õg_PÎß ö᮳À £h® Áøµ¢x £õP[PøÍ SÔUPÄ®.
Draw Gemmule in sponges and label the parts.

26. |©x C¢v¯ |õmiÀ •Êø©¯õP CÚ¨ö£¸UP B÷µõUQ¯zøu Aøh¯
÷©ØöPõÒÍ ÷Ási¯ ‰ßÖ EzvPÒ ¯õøÁ ?
What are the three strategies to be implemented in India to attain total reproductive health ?

27. £õÀ\õº¢u Jk[S £s¦ ©µ¦ PhzuÀ BsPÎÀ Hß AvP©õPU Põn¨£kQÓx ?
Why are sex linked recessive characters more common in the male human beings ?

28. Bº.Gß.H ©ØÖ® i.Gß.H BQ¯ÁØÖUQøh÷¯ EÒÍ Aø©¨¦ \õº¢u
÷ÁÖ£õkPÒ ‰ßÔøÚ SÔ¨¤kP.
What are the three structural differences between RNA and DNA ?

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29. ""\õuõµn \ÎUS'' GvµõP uk¨¦ ©¸¢øu EØ£zv ö\´¯ •i¯õux £ØÔ } GßÚ
{øÚUQÓõ´ ?
What do you think about it is not possible to produce vaccine against “common cold” ?

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What is SMOG and how is it harmful for us ?

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©µ£q ""öÁÎ÷¯ØÓ®'' GßÓõÀ GßÚ ?
What is gene “knock out” ?

32. µõ÷ÁõÀL¤¯õ Áõª÷hõ›¯õ GÝ® ©¸zxÁ uõÁµzvÀ EÒÍ ö\¯À£k
÷Áv¨ö£õ¸Îß ö£¯º GßÚ ? Cx G¢u ÁøP £ÀÁøPzußø©ø¯ \õº¢xÒÍx ?
Name the active chemical found in the medicinal plant Rauwolfia Vomitoria. What type of

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las Ai¨£øh°À E°ºGvº¨ö£õ¸ÒPøÍ
ÁøP¨£kzxP.
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Classify the antibiotics based on their action on bacteria.

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SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25

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Note : Answer all the questions.

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34. ©Ûu Ash ö\À¼ß Aø©¨ø£z uS¢u Áøµ£hzxhß
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(a) Describe the structure of the human ovum with a neat labelled diagram.

OR

(b) Give an account on population regulation.

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9037 10

35. (A) ¤øÚÀRm÷hõ{³›¯õ ©ØÖ® hÄß ]sm÷µõ® BQ¯ÁØÔß
AÔSÔPøÍU SÔ¨¤kP.

AÀ»x

(B) i.Gß.H Cµmi¨£õu¾UPõÚ ö©\À\ß ©ØÖ® ìhõÀ BQ÷¯õ›ß ÷\õuøÚ
ÁÈ•øÓPøÍ ÂÍUSP.

(a) Mention the symptoms of Phenylketonuria and Down’s Syndrome.

OR

(b) Explain the experimental proof of DNA replication by Meselson and Stahl.

36. (A) hõºÂß S¸ÂPÒ ©ØÖ® Bìv÷µ¼¯ ø£¨£õ¿miPÒ BQ¯øÁ
uPÁø©¨¦¨ £µÁ¾UPõÚ ]Ó¢u GkzxUPõmkPÒ BS®. ö\õØöÓõhøµ
{¯õ¯¨£kzxP.

AÀ»x

(B) ¦÷µõm÷hõ÷\õÁõ ÷|õ´Pøͨ £ØÔ SÔ¨¦ ÁøµP.

(a) Darwin’s finches and Australian marsupials are suitable examples of adaptive radiation

- Justify the statement.

OR

(b) Write a note on the Protozoan diseases.

37. (A) ö\¯»õUP ©ØÖ® ©¢u©õÚ ÷|õ´zuøhPõ¨¦ ÷ÁÖ£kzxP.

AÀ»x

(B) ©Ö÷\ºUøP uk¨§]PÒ Gß£Ú ¯õøÁ ? Auß ÁøPPøÍ ÂÍUSP.

(a) Difference between Active and Passive immunity.

OR

(b) What are the recombinant vaccines ? Explain their types.

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38. (A) Bs ©ØÖ® ö£sPÎÀ ©»mkzußø©UPõÚ Põµn[PøÍ GÊxP.
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(B) ""A¯À ]ØÔÚ[PÎß £øhö¯k¨¦ K›h ]ØÔÚ[PÐUS Aa_Özu»õP
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(a)

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Write the causes for infertility in males and females.

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OR

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(b) “Alien species invasion is a threat to endemic species” - Substantiate this statement.

- o O o -

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M [ v¸¨¦P / Turn over

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