TN 12th Question Paper 2026 Botany

FOR TN 12TH EXAM PREPARATION

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

TN 12th 2026 Question Paper Botany

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 11
9032
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!9032Botany!
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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

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
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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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9032 2

1. ¦PÌö£ØÓ C¢v¯ P¸Â¯À ÁÀ¾Úº :
(A) M.S. _Áõª|õuß (B) S.R. Põ诨
(C) K.C. ÷©zuõ (D) P. ©÷PìÁ›
An eminent Indian embryologist is :

(a) M.S. Swaminathan (b) S.R. Kashyap

(c) K.C. Mehta (d) P. Maheswari

2. ÷\õuøÚU P»¨¦ EÒÍhUQ¯x :

(A) F
1
P»¨¦°›²hß C¸ Jk[S ©µ£qÁøP¯® öPõshøÁPÎß P»¨¦
(B) C¸ ©µ£qÁõUP[PÒ Jk[Q¯ £s¦hß P»¨¦ÖuÀ
(C) C¸ ©µ£qÁõUP ÁøP¯[PÐhß K[S £s¦ P»¨¦
(D) F
1
P»¨¤Ú[PÎøh÷¯ |øhö£Ö® P»¨¦
The test cross involves :

(a) Crossing the F hybrid with a double recessive genotype
1

(b) Crossing between two genotypes with recessive trait

(c) Crossing between two genotypes with dominant trait

(d) Crossing between two F hybrids
1

3. £iö¯kzu¼ß ÷£õx CsmµõßPøÍ öÁÎ÷¯ØÔ²®, GU\õßPøÍ ¤ønUS®
Caö\¯»õUPzvØS :

(A) yskuÀ (B) Cø¯zuÀ
(C) |ÖUSuÀ (D) ÁøÍÁõUSuÀ
Removal of introns and joining of exons in a defined order during transcription is called :

(a) Inducing (b) Splicing

(c) Slicing (d) Looping

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4. P¸ÄØÓ P¸¨ø£°À J¸©i¯, C¸©i¯, •®©i¯ Aø©¨¦PÎß \›¯õÚ
Á›ø\ Gx ?

(A) Gvµia ö\À, ]Úºâm, •uÀ{ø» P¸Ås EmP¸

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(B) ]Úºâm, P¸•møh, •uÀ{ø» P¸Ås EmP¸
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(C) ]Úºâm, x¸Á
e m l a
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l Gvµia ö\À, x¸Á EmP¸UPÒ ag
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(D) ]Úºâm,
a
The correct order of haploid, diploid and triploid structure in fertilized embryo sac is :

(a) Antipodal, Synergid and PEN

(b) Synergid, Zygote and PEN

(c) Synergid, Polar nuclei and Zygote

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(d) Synergid, Antipodal and Polar nuclei

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Cµmi¨£õu¼ß ÷£õx Cµmøh
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5. DNA

•ÖUS ö\ÔÂß CÖUPzøu APØÖ® :

(A) ÷hõ÷£õI÷\õ©÷µì

(B) iGßH £õ¼÷©÷µì

(C) BºGßH ¤øµ÷©ì
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(D) ø»÷Pì
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The enzyme which eliminates the torsional stress caused by the unwinding of double helix

s e during the DNA replication is :

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a (a) Topoisomerase

(b) DNA Polymerase

(c) RNA Primase

(d) Ligase

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9032 4

6. ¤ßÁ¸ÁÚÁØÖÒ Gx £ÀTmk £õµ®£›¯zvØS Euõµn©õS® ?

(A) ÷uõmh¨ £mhõo°ß ÂøuU PÛ°ß ÁiÁ®

(B) ªµõ¤¼ì á»õ£õ ©»›ß {Ó®

(C) ©ÛuºPÎß ÷uõÀ {Ó®

(D) Bs ÷uÜ EØ£zv

Which one of the following is an example of polygenic inheritance ?

(a) Pod shape in garden pea

(b) Flower colour in Mirabilis jalapa

(c) Skin colour in humans

(d) Production of male honeybee

7. ©µ£q¨ ö£õÔ°¯À Gߣx :

(A) ~sq°›Pøͨ £¯ß£kzv BÀPíõÀ EØ£zv

(B) ö\¯ØøP ©µ£qUPøÍ E¸ÁõUSuÀ

(C) ECG, EEG ÷£õßÓ PshÔ²® P¸ÂPÒ, ö\¯ØøP EÖ¨¦PÒ E¸ÁõUSuÀ

(D) J¸ E°›Úzvß DNA ©ØÓøÁPÐhß P»¨¤Ú® ö\´uÀ

Genetic engineering is :

(a) Production of alcohol by using micro-organisms.

(b) Making artificial genes.

(c) Making artificial limbs, diagnostic instruments such as ECG, EEG etc.,

(d) Hybridization of DNA of one organism to that of the others.

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8. ö£hõöáÛêì Gߣx GuÝhß öuõhº¦øh¯x ?
(A) E°›zöuõøP (B) öuõÀ¾°› £iÁ®
(C) ©s (D) }º
Pedogenesis refers to :
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(a) Population (b) Fossils

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(c) Soil

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(d) Water

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£mi¯À - I - II Ehß ö£õ¸zxP.
£mi¯À - I £mi¯À - II

(1) Áͺ¨¦ AøÓ ~sq°º }UP® (i) ÷©\÷µõø\®
(2) ¦÷µõm÷hõ¤Íõìm CønÄ (ii) GzuÚõÀ
(3) vh¨£kzx® Põµo (iii) APõº
m £õ¼Gzv½ß QøÍUPõÀ
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(4) ¦÷µõm÷hõ¤Íõìmøh ¤›zöukzuÀ (iv)

(A)
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(1) - (ii), (2) - (iv), (3) - (iii), (4) - (i)

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(B)
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(1) - (i), (2) - (iv), (3) - (iii), (4) - (ii)

(C) (1) - (iv), (2) - (iii), (3) - (ii), (4) - (i)

(D) (1) - (i), (2) - (ii), (3) - (iii), (4) - (iv)

Match List - I with List - II :

List - I List - II

(1) Sterilization of culture room (i) Macerozyme
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(2) Fusion of protoplast (ii) Ethanol

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Polyethylene Glycol

ag (a) (1) - (ii), (2) - (iv), (3) - (iii), (4) - (i)

(b) (1) - (i), (2) - (iv), (3) - (iii), (4) - (ii)

(c) (1) - (iv), (2) - (iii), (3) - (ii), (4) - (i)

(d) (1) - (i), (2) - (ii), (3) - (iii), (4) - (iv)

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9032 6

10. SÍ® J¸ ÁøP¯õÚ :

(A) PhÀ `ÇÀ ©sh»® (B) ÁÚa `ÇÀ ©sh»®
(C) |ßܺ `ÇÀ ©sh»® (D) ¦ÀöÁÎ `ÇÀ ©sh»®
Pond is a type of :

(a) Marine ecosystem (b) Forest ecosystem

(c) Freshwater ecosystem (d) Grassland ecosystem

11. Gzvi¯® ¦÷µõø©k G¢u öuõÈÀ~m£•øÓ°À £¯ß£kzu¨£kQÓx ?
(A) £õ¼©÷µì \[Q¼z öuõhºÂøÚ
(B) \uºß JØÔö¯k¨¦ öuõÈÀ~m£•øÓ
(C) AP÷µõì CÊ© ªßÚõØ ¤›¨¦
(D) öÁìmºß JØÔö¯k¨¦ öuõÈÀ~m£•øÓ
In which technique is Ethidium Bromide used ?

(a) Polymerase Chain Reaction

(b) Southern Blotting Technique

(c) Agarose Gel Electrophoresis

(d) Western Blotting Technique

12. G¢u JßÖ, EnÄa \[Q¼°ß CÓ[S Á›ø\ BS® ?
(A) ‰ßÓõ®{ø» ~Pº÷ÁõºPÒ → Cµshõ®{ø» ~Pº÷ÁõºPÒ → •uÀ{ø»
~Pº÷ÁõºPÒ → EØ£zv¯õͺPÒ
(B) EØ£zv¯õͺPÒ → Cµshõ®{ø» ~Pº÷ÁõºPÒ → •uÀ{ø» ~Pº÷ÁõºPÒ
→ ‰ßÓõ®{ø» ~Pº÷ÁõºPÒ
(C) ‰ßÓõ®{ø» ~Pº÷ÁõºPÒ → EØ£zv¯õͺPÒ → •uÀ{ø» ~Pº÷ÁõºPÒ
→ Cµshõ®{ø» ~Pº÷ÁõºPÒ
(D) ‰ßÓõ®{ø» ~Pº÷ÁõºPÒ → •uÀ{ø» ~Pº÷ÁõºPÒ → Cµshõ®{ø»
~Pº÷ÁõºPÒ → EØ£zv¯õͺPÒ
Which one is in descending order of a food chain ?

(a) Tertiary consumers → Secondary consumers → Primary consumers → Producers
(b) Producers → Secondary consumers → Primary consumers → Tertiary consumers
(c) Tertiary consumers → Producers → Primary consumers → Secondary consumers
(d) Tertiary consumers → Primary consumers → Secondary consumers → Producers

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13. \ÀL£º&øh&BUøék ©õ_ _miUPõmi uõÁµ[PÒ :

(A) U÷Íi÷¯õ»ì, ²UPΨhì
(B) ö£mkÛ¯õ, Qøµ\õ¢v©®

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(C) öµõ¥Û¯õ `÷hõA÷P]¯õ, ÷P_øµÚõ
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(D) ø»UPßPÒ, ÷µõáõ
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Plant indicator for SO pollution is :
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ag
2

(a)

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Gladiolus, Eucalyptus

(b) a
Petunia, Chrysanthemum

(c) Robinia pseudoacacia, Casuarina

(d) Lichens, Rose

14. £°º ö£¸UPzvß ‰»® J÷µ ©õv›¯õÚ ©µ£q ÁøP¯® öPõsh uõÁµ[Pøͨ
ö£Ö® •øÓ :

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(A) uߣߩi¯® (B) |P»õUP®
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(C) ©µ£qöuõøP¯®
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(D) JØøÓ©i¯®

g la
a
Plants having similar genotypes produced by plant breeding are called :

(a) Autopolyploid (b) Clone

(c) Genome (d) Haploid

15. ¤ßÁ¸ÁÚÁØÖÒ ö£õ¸zu©õÚ Cøn Gx ?
(A) ìjÂ÷¯õø\k & C¯ØøP CÛ¨¦
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(B) £øÚ ©µ® & ¤÷µ]ø»¨ ¤Ó¨¤h©õP öPõshx
om £uܺ & GzuÚõ¾UPõP ö|õvUP øÁUP¨£kQÓx
c. (C) e m
e m (D) P¸®¦ & PßÛ¯õS©›°À AvP©õP EÒÍx l as
las ag
ag Which one of the following matches is correct ?

(a) Steveocide - Natural Sweetener

(b) Palmyra - Native of Brazil

(c) Palmyra sap - Fermented to give ethanol

(d) Saccharum - Abundant in Kanyakumari

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9032 8

£Sv & II / PART - II

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

Note : Answer any six questions. Question No. 24 is compulsory.

16. }º £izu H÷uÝ® Cµsk Fmh FhPzvß ö£¯ºPøÍ GÊxP.
Name any two nutrient media that you have studied.

17. ö©sh¼¯zøu ©Ö B´Ä ö\´x PshÔ¢u AÔ¯À AÔbºPÎß ö£¯ºPøÍ
GÊxP.
Write the names of the scientists who rediscovered Mendelism.

18. ¤ÍÄ£kzu¨£mh C¸Âzvø» Âøu°ß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw and label a cut opened Dicot seed.

19. ÷ÁÍõs ÷Ávö£õ¸mPÒ GßÓõÀ GßÚ ?
What are agrochemicals ?

20. ©Ûu B÷µõUQ¯zvØSU Põµn©õÚ EhÀ }º©[PÎß ö£¯ºPøÍz u¸P.
Name the humors that are responsible for the health of human beings.

21. ÷Áva \õ¯zøu ÷£õk® J¸Á¸US G›a\À Á¸QÓx. }[PÒ AuØS ©õÓõP Gøu
]£õ›_ ö\´ÃºPÒ ?
A person gets irritation while applying chemical dye. What would be your suggestion for

alternative ?

22. PÛUSÒ Âøu •øÍzuÀ GßÓõÀ GßÚ ?
What is vivipary ?

23. uÁÖu»õP¨ ö£õ¸Ò£k®, ö£õ¸Ðnºzuõu \kv©õØÓzvØS Cøh÷¯¯õÚ
÷ÁÖ£õk GßÚ ?
What is the difference between missense and nonsense mutation ?

24. J¸ ¦ÀöÁÎ `ÇÀ ©sh»zvÀ ‰ßÓõ® Fmh E°›Ú[PÐUS áüÀ (T )
3
400

BØÓÀ QøhUP¨ ö£ØÓõÀ •uÀ Fmh ©mhzvÀ GÆÁÍÄ BØÓÀ (T
1
)

C¸¢v¸US® GÚ PnUQkP.
In a grassland ecosystem an organism of (T ) third trophic level derives 400 joules of energy.
3

How much energy would be there in first trophic (T ) level ? Calculate.
1

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£Sv & III / PART - III

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

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Note : Answer any six questions. Question No. 33 is compulsory.

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©µ£q Áøµ£h® GßÓõÀ GßÚ ? Cuß £¯ßPøÍ GÊxP.
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25.

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What is gene mapping ? Write its uses.

g la
26. a
•Êø©ö£Óõ K[Sz ußø©ø¯ Cøn K[S ußø©°¼¸¢x ÷ÁÖ£kzxP.
Differentiate incomplete dominance with co-dominance.

27. Âøu÷|ºzv°ß £¯ßPøͨ £mi¯¼kP.
List out the benefits of seed treatment.

28. E°›ÁÈz v¸zu® GßÓõÀ GßÚ ? E°›ÁÈz v¸zuzvØS J¸ GkzxUPõmk
m
u¸P.
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What is bioremediation ? Give an example of bioremediation.

g la ‰»® ÁͺUP¨£k® |õßS uõÁµ
29.
a
ÁoP ÷ÁÍõs Põk Áͺ¨¦
GkzxUPõmkPøÍz u¸P.
Give four examples of plants cultivated in commercial agroforestry.

30. ö\¯ØøP ÂøuPÎß |ßø©PøÍ £mi¯¼kP.
List out the advantages of Artificial seeds.

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31.

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xøn £Û©ø»U PõkPÎÀ Põn¨£k® H÷uÝ® ‰ßÖ uõÁµ[PÎß ö£¯ºPøÍ
.co
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s e m
s e Name any three plants found in Sub-Alpine forests.

g l a
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a 32. ÷£õ»ß Qm £ØÔ ]Ö SÔ¨¦ ÁøµP.
Give short note on pollen kitt.

33. öuõØÖz uõÁµ® & ÁõshõÂß £h® Áøµ¢x £õP® SÔUPÄ®.
Draw and label the structure of epiphytic plant Vanda.

M [ v¸¨¦P / Turn over

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9032 10

£Sv & IV / PART - IV

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

Note : Answer all the questions.

34. (A) £_[PoP ©µ£q \õº¢u £õµ®£›¯zøu GkzxUPõmkhß öÁÎ öPõnºP.
AÀ»x
(B) uÛ ö\À ¦µuzvß £¯ß£õkPøͨ £mi¯¼kP.
(a) Bring out the inheritance of chloroplast gene with an example.

OR

(b) List out the applications of single cell protein.

35. (A)¦v¯ PõkPÒ ÷uõØÖÂzu¼À uÛ B´ÄPÒ SÔzx ÂÍUSP.
AÀ»x
(B) uõÁµ v_ Áͺ¨¤À Ah[Q²ÒÍ Ai¨£øhU öPõÒøPPøÍ ÂÍUSP.
(a) Explain afforestation with case studies.

OR

(b) Explain the basic concepts involved in plant tissue culture.

36. (A) uS¢u £hzxhß `¼ß Aø©¨ø£ ÂÍUPÄ®.
AÀ»x
(B) |Ö©n¨ ö£õ¸mPÎß Aµ\ß GÚ AøÇUP¨£kÁx Gx ? Auß ÷uõØÓ®
©ØÖ® £¯ßPøÍ GÊxP.
(a) With a suitable diagram explain the structure of an ovule.

OR

(b) Which is called as the “King of Spices” ? Write its origin and uses.

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37. (A) £õµ®£›¯ Âøu £õxPõ¨¦ •øÓPøͨ £mi¯¼kP.
AÀ»x
(B) Gvº©øÓ Cøha ö\¯À GßÓõÀ GßÚ ? AÁØÔß ÁøPPÒ ©ØÖ®
ÂøÍÄPøÍ GkzxUPõmkhß AmhÁøn¨£kzxP.
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(a) List out the traditional methods of seed protection.

m s e
s e OR

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(b)
l a
What is negative interaction ?

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Tabulate its types and effects with example.
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38. (A) ©ÛuÚõÀ E¸ÁõUP¨£mh uõÛ¯zvß ö£¯øµ GÊxP. Cx GÆÁõÖ
E¸ÁõUP¨£kQÓx ?
AÀ»x
(B) J¸ SÔ¨¤mh `ÇÀ ©sh»zvß ¤µªm ÁiÁ©õÚx G¨ö£õÊx®
©õÖ£mh ÁiÁzøuU öPõskÒÍx. AuøÚ GkzxUPõmkhß ÂÍUSP.
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(a) Mention the name of man-made cereal. How is it formed ?

l asOR

(b)
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Shape of pyramid in a particular ecosystem is always different in shape. Explain with

example.

- o O o -

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