TN 11th Question Paper 2026 Biology

FOR TN 11TH EXAM PREPARATION

TN 11th 2026
Question Paper ·
Biology
EXAM YEAR TYPE SUBJECT

TN 11th 2026 Question Paper Biology

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 11
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!9127IstYearBiology! £vÄ Gs
Register Number

PART - III
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( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version)

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ö©õzu ©v¨ö£sPÒ : 70

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Time Allowed : 3.00 Hours ] [Maximum Marks : 70

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
öPõÒÍÄ®. Aa_¨£vÂÀ SøÓ°¸¨¤ß AøÓU PsPõo¨£õÍ›h®
EhÚi¯õPz öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ ©mk÷© GÊxÁuØS®
AiU÷PõikÁuØS® £¯ß£kzu ÷Ásk®. £h[PÒ ÁøµÁuØS
ö£ß]À £¯ß£kzuÄ®.
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Instructions : (1) Check the question paper for fairness of printing. If there is any lack of fairness,

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inform the Hall Supervisor immediately.

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

SÔ¨¦ : £Sv& (E°›&uõÁµÂ¯À), £Sv& (E°›&»[Q¯À) uÛzuÛ ÂøhzuõÎÀ
I II

Âøh¯ÎUPÄ®.
Note : Candidate should answer Part-I (Bio-Botany) & Part-II (Bio-Zoology) in separate

answer books.

£Sv - I (E°›&uõÁµÂ¯À) / PART - I (BIO-BOTANY)

(©v¨ö£sPÒ : 35) / (Marks : 35)
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- 1 / SECTION - 1

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(i) 8x1=8

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Âøhø¯z ÷uº¢öukzx 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

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1. ©µ¦ÁÈ ÁøP¨£õk GuøÚ¨ ¤µv£¼¨£uõÀ ªPÄ® ¸®£zuUP ÁøP¨£õhõP
EÒÍx.
(A) J¨¥mk ö\À¼¯À
(B) J¨¥mk EÒÍø©¨¤¯À
(C) £›nõ© EÓÄ•øÓ
(D) EØ£zv ö\´¯¨£mh §UPÎß GsoUøP
Phylogenetic classification is the most favoured classification because it reflects :

(a) Comparative cytology

(b) Comparative Anatomy

(c) Evolutionary relationships

(d) Number of flowers produced

2. \›¯õP¨ ö£õ¸¢v¯ Cønø¯U PshԯĮ :
(A) Bìi÷¯õìQ¼øµkPÒ & møµ÷Põöhßmµõß
(B) ¤÷µUQìQ¼øµkPÒ & S÷µõmh÷»›¯õ
(C) Bìi÷µõìQ¼øµkPÒ & ©õßìjµõ
(D) ÷©U÷µõìQ¼øµkPÒ & ø£\®
Identify the correctly matched pair.

(a) Osteosclereids - Trichodendron

(b) Brachysclereids - Crotalaria

(c) Astrosclereids - Monstera

(d) Macrosclereids - Pisum

3. öh›÷hõLø£mkPÎÀ ÷P«mhP uõÁµ \¢uvø¯U SÔ¨£x.
(A) T®¦ (B) •ß Eh»® (C) ÷Áºzuõ[Q (D) Eh»®
Which of the following represents gametophytic generation in Pteridophytes ?

(a) Cone (b) Prothallus (c) Rhizophore (d) Thallus

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 2 of 12

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4. Esø©U PÛ Gߣx :
(A) ©»›ß `»P¨ø£, ¦À¼ Ámh® ©ØÖ® §zuÍ® PÛ¯õP E¸ÁõÁx.
(B) ©»›ß `»P¨ø£ ©mk÷© PÛ¯õP E¸ÁõÁx
(C) ©»›ß AøÚzx Ámh[PЮ PÛ¯õP E¸ÁõÁx.
(D) ©»›ß `»P¨ø£ ©ØÖ® ¦À¼Ámh® PÛ¯õP E¸ÁõÁx. m
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A True fruit is the one where

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(a) Ovary, Calyx and Thalamus of the flower develop into fruit

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(b)

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Only ovary of the flower develops into fruit

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(c) All floral whorls of the flower develop into fruit

(d)
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Ovary and calyx of the flower develop into fruit

5. P¨¤°ß Âmh® A[S»®, SÔ•ÒÎß }Í®
12 A[S»® ©ØÖ® SÔ•Ò 10

|Pº¢u yµ® A[S»©õP C¸¢uõÀ uõÁµzvß Esø©¯õÚ }Ò Áͺa]ø¯U
5

Psk¤iUPÄ®.
(A) A[S»® (B) A[S»®
12 (C) A[S»® (D) A[S»®
3 30 6

If the diameter of the pulley is 12 inches, length of pointer is 10 inches and distance travelled

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by pointer is 5 inches, calculate the actual growth in length of the plant.

(a) 12 inches (b) 3 inches (c) 30 inches (d) 6 inches

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6. TØÖ :
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BUêá÷ÚØÓ £õ죛Pµn® ø©m÷hõPõsm›¯õÂß G»Umµõß
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Phzxa \[Q¼°Àg |øhö£ÖQÓx.
Põµn® : \U]øÚÀ £õ죛Pµn® Aøh¢x \U]ÛU Aª»©õP
CoA

uͨö£õ¸Ò £õ죛PµnzuõÀ |øhö£ÖQÓx.
(A) TØÖ \› BÚõÀ Põµn® uÁÖ.
(B) TØÖ ©ØÖ® Põµn® Cµsk® \›. Põµn® TØÖUPõÚ \›¯õÚ ÂÍUP®
BS®.
(C) TØÖ ©ØÖ® Põµn® Cµsk® uÁÖ.
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(D) TØÖ ©ØÖ® Põµn® Cµsk® \› BÚõÀ Põµn® TØÖUPõÚ \›¯õÚ
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ÂÍUP® AÀ».
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Oxidative phosphorylation takes place during the electron transport chain

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las Reason :
in Mitochondria.

Succinyl CoA is phosphorylated into
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Succinic acid by substrate

ag phosphorylation.

(a) Assertion is correct but Reason is wrong.

(b) Assertion and Reason are correct, Reason is correct explanation of Assertion.

(c) Both Assertion and Reason are wrong.

(d) Assertion and Reason are correct, but Reason is not the correct explanation of

Assertion.

[ v¸¨¦P / Turn over

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7. RÌÁ¸ÁÚÁØÖÒ G¢u JßÖ ö\vÀ £møhUS GkzxUPõmk ?
(A) ø£Úì (B) öPõ´¯õ (C) ø\Pì (D) SºPì
Which one of the following is an example for Scale bark ?

(a) Pinus (b) Guava (c) Cycas (d) Quercus

8. ö£õ¸zxP.
(1) {ÓªPÒ (i) Põß÷PÚÁõ¼ß A

(2) AÀP»õ´kPÒ (ii) øµ]ß
(3) |a_PÒ (iii) ©õºL¤ß
(4) ö»UißPÒ (iv) B¢÷uõ\¯oß
(A) (1)-(ii), (2)-(iii), (3)-(iv), (4)-(i)

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

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

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

Match the following :

(1) Pigments (i) Concanavalin A

(2) Alkaloids (ii) Ricin

(3) Toxins (iii) Morphine

(4) Lectins (iv) Anthocyanins

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

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

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

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

¤›Ä - 2 / SECTION - 2

SÔ¨¦ : GøÁ÷¯Ý® |õßS ÂÚõUPÐUS Âøh¯ÎUPÄ®. 4x2=8

Note : Answer any four questions.

9. \õØÖUPmøh, øÁµUPmøh ÷ÁÖ£kzxP.
Differentiate Sap wood and Heart wood.

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 4 of 12

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10. ö|õvPÒ & Áøµ¯ÖUPÄ®
Define Enzymes.

11. }›¯À vÓøÚU Pmk¨£kzx® TÖPÒ ¯õøÁ ?
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What are the parameters which Control Water Potential ?

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_Áõ]zu¼ß a £i{ø»PøÍ SÔ¨¤kP.
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Mention the stages of Respiration.

13. §Áiaö\v¾øh¯, §UPõ¨¦a ö\v»ØÓ C¸£õÀ©»º, •Êø©¯õÚ I¢u[P ©»º
uÛzu ¦À¼Ámh®, uÛzu AÀ¼Ámh®, ÷©À©mha `»P¨ø£ öPõsh ©»›ß
©»º `zvµzvøÚ GÊxP.
Find out the floral formula for a bisexual flower with bract, regular, pentamerous, distinct

Calyx and Corolla, Superior Ovary without bracteole.
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14. }º FhP Áͺ¨¦ £ØÔ ]Ö SÔ¨¦ GÊuÄ®.
Write a short note on Hydroponics.
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¤›Ä - 3 / SECTION - 3

SÔ¨¦ : GøÁ÷¯Ý® ‰ßÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 19 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 3x3=9

Note : Answer any three questions. Question No. 19 is Compulsory.

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c. GÊuÄ®.
15.

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Write any three significance of Mitosis.

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16. â®÷Úõìö£º®PÐUS®, Bg]÷¯õìö£º®PÐUS® Cøh÷¯ Põn¨£k®
ö£õxÁõÚ H÷uÝ® ‰ßÖ £s¦PøÍ GÊuÄ®.
Write any three characters shared by Gymnosperms and Angiosperms.

[ v¸¨¦P / Turn over

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17. J¸ |k |µ®£ø©ÄUS®, £» |k |µ®£ø©ÄUS® Cøh÷¯²ÒÍ ÷ÁÖ£õmøhU
TÖP.
Differentiate Unicostate with Multicostate Venation.

18. C¸£UP J¸[Pø©¢u ÁõìS»U PØøÓ°ß £h® Áøµ¢x £õP[PøÍ SÔUPÄ®.
Draw and label the parts of bicollateral Vascular bundle.

19. A¨]]U Aª»zvß Áõ̯À ÂøÍÄPÎÀ H÷uÝ® ‰ßÔøÚ GÊuÄ®,
Write any three physiological effects of Abscisic Acid.

¤›Ä - 4 / SECTION - 4

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 2x5=10

Note : Answer all the questions.

20. (A) I®ö£¸® ¤›Ä ÁøP¨£õmiøÚ _¸UP©õP ÂÁ›UPÄ®.
AÀ»x
(B) C uõÁµ[PÒ ©ØÖ®
3
C
4
uõµÁ[PÐUS Cøh÷¯²ÒÍ ÷ÁÖ£õkPøÍ
AmhÁøn¨£kzuÄ®.
(a) Briefly discuss on Five Kingdom classification.

OR

(b) Tabulate the differences between C plants and C Plants.
3 4

21. (A) hõmkµõ ö©mhÀ uõÁµzøu Pø»a ö\õØPÍõÀ ÂÁ›UPÄ®.
AÀ»x
(B) EmP¸Âß Aø©¨ø£ ÂÁ›UPÄ®.
(a) Discuss the botanical description of Datura metel.

OR

(b) Explain the structure of Nucleus.

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 6 of 12

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£Sv & II (E°›&»[Q¯À) / PART - II (BIO-ZOOLOGY)

(©v¨ö£sPÒ : 35) / (Marks : 35)

¤›-Ä & 1 / SECTION - 1

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SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 8x1=8

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öPõkUP¨£mkÒÍ |õßS ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯
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(ii)

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Âøhø¯z ÷uº¢öukzxU SÔ±mkhß Âøh°øÚ²® ÷\ºzx
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GÊuÄ®.
Note : (i)

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

the option code and the corresponding answer.

1. Cøn¨¦z v_Âß uͨö£õ¸ÎÀ Põn¨£k® |õ›øÇ ¯õx ?

(A) S¸zöu¾®¦ (B) öPõ»õáß
(C) SÇÀ ÁiÁ |õ›øÇ (D) H›÷¯õ»õº
What type of fibre is found in connective tissue matrix ?

(a) Cartilage (b) Collagen

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(c) Tubular (d)
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Areolar

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2. CÁØÖÒ ö£õ¸zu©ØÓ Cønø¯z
g la÷uº¢öuk.
(A) £À¼PÒ & ³›÷Põöh¼U a
(B) ©ÛuºPÒ & ³›÷¯õöh¼U
(C) vª[P»® & A®÷©õ÷Úõöh¼U
(D) £ÓøÁPÒ & ³›÷Põöh¼U
Which of the following is not correctly paired ?

(a) Lizards - Uricotelic

(b) Humans - Ureotelic
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(c) Whale - Ammonotelic

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(d) Birds - Uricotelic

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(A) ÁøÍ¢ux (B) ]U©õ´k
(C) }Ò \xµ ªøP ÁøÍÄ (D) ÷|ºU÷Põk
The oxygen Dissociation Curve is :

(a) Curved (b) Sigmoid

(c) Rectangular hyperbola (d) Straight line

[ v¸¨¦P / Turn over

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4. Cu¯zvÀ h¨ J¼ CuÚõÀ HØ£kQÓx :
(A) Aøµa\¢vµ ÁõÀÄPÒ ‰kÁuõÀ
(B) B›US÷»õ&öÁßm›US»õº ÁõÀÄPÒ ‰kÁuõÀ
(C) B›US÷»õ&öÁßm›US»õº ÁõÀÄPÒ vÓ¨£uõÀ
(D) Aøµa\¢vµ ÁõÀÄPÒ vÓ¨£uõÀ
Dub sound of heart is caused by :

(a) Closure of semi-lunar valves

(b) Closure of atrio-ventricular valves

(c) Opening of atrio-ventricular valves

(d) Opening of semi-lunar valves

5. BºÛøuß _ÇØ]°ß ÂøÍö£õ¸Ò ¯õx ?
(A) ³›¯õ (B) Põº£ß&øh&BUøék
(C) A÷©õÛ¯õ (D) ³›U Aª»®
The end product of Ornithine cycle is :

(a) Urea (b) Carbon-di-oxide

(c) Ammonia (d) Uric acid

6. TØÖ C¸÷ÁÖ u©ÛPÒ Cøn²® Ch[PÒ AÚì÷hõ÷©õ\ì AÀ»x
I :

Cøn¨¤h[PÒ GÚ¨£kQßÓÚ.
TØÖ H÷uÝ® CµzuU SÇõ´ Aøh¨¦ HØ£k®÷£õx CøÁ ©õØÖ¨
II :

£õøuPÍõP ö\¯À£mk CµzuzøuU PhzxQÓx.
(A) Cµsk TØÖPЮ \›¯õÚx.
(B) TØÖ \›¯õÚx BÚõÀ TØÖ uÁÓõÚx.
I II

(C) Cµsk TØÖPЮ uÁÓõÚx.
(D) TØÖ uÁÓõÚx BÚõÀ TØÖ \›¯õÚx.
I II

Statement I : Anastomoses are connection of one blood vessel with another blood vessel.

Statement II : They provide alternate route of blood flow if original blood vessel is blocked.

(a) Both Statements are correct.

(b) Statement I is correct but Statement II is wrong.

(c) Both Statements are wrong.

(d) Statement I is wrong but Statement II is correct.

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 8 of 12

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7. •Ç[øP°ß Tºø© £Sv :
(A) J¼Qµõnß }m] (B) HS÷µõª¯ß }m]
(C) CønÄ (D) QÎ|õ´k SÈ
The pointed portion of the elbow is :

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(a) Olecranon process (b) Acromion process

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(c)

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Symphysis (d) Glenoid cavity

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\›¯õPaö£õ¸zu¨£mkÒÍ Cønø¯ ÷uºÄ ö\´P.
(A) B¢u÷µ°¯õ ø©¼mhõ & héº £mk
(B) £õ®¤Uì ÷©õ› & G› £mk
(C) AmhõPì ›]Û & •Põ £mk
(D) B¢u÷µ°¯õ Aìéõö©ß]ì & ©Àö£› £mk
Choose the correctly matched pair.

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(a) Antheraea mylitta - Tassar silk

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(b) Bombyx mori - Eri silk

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(c) Attacus ricini - Muga silk
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(d) Antheraea assamensis - Mulberry
a silk

¤›Ä - 2 / SECTION - 2

SÔ¨¦ : GøÁ÷¯Ý® |õßS ÂÚõUPÐUS Âøh¯ÎUPÄ®. 4x2=8

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Note : Answer any four questions.

9.
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c. GUìm›÷©õLø£Àì- GßÓõÀ GßÚ
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em a
What is extremophiles ?

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10. ?

Why flatworms are called Acoelomates ?

11. uÁøÍ°À Põq® _Áõ\ •øÓPøͨ ö£¯›kP.
Write the types of respiration seen in frog.

[ v¸¨¦P / Turn over

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12. {÷©õÛ¯õ Hß J¸ B£zuõÚ ÷|õ¯õPU P¸u¨£kQÓx ?

Why is pneumonia considered a dangerous disease ?

13. ¦Óo¨£Sv ö|L¨µõßPøÍ ö©kÀ»õ¨£Sv ö|L¨µõßPÎhª¸¢x ÷ÁÖ£kzxP.
Differentiate Cortical from Medullary nephrons.

14. øuµõ´k _µ¨¤°ß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw and label the parts of Thyroid gland.

¤›Ä - 3 / SECTION - 3

SÔ¨¦ : GøÁ÷¯Ý® ‰ßÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 19 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 3x3=9

Note : Answer any three questions. Question No. 19 is Compulsory.

15. ‰i¯ ©ØÖ® vÓ¢uÁøP Cµzu Kmh ©sh»zøu J¨¤kP.
Compare closed and opened Circulatory System.

16. Ck¨¦ Áøͯzv¾ÒÍ G¾®¦PÒ ¯õøÁ ?

What are the bones that make the Pelvic Girdle ?

17. Q›iÛ\zvß AÔSÔPøÍU SÔ¨¤kP.
Mention the symptoms of Cretinism.

18. £ÓøÁ Áͺ¨¤ß £¯ßPÒ ‰ßÔøÚU TÖP.
State any three benefits of poultry farming.

19. öPõʨ¦ ©ØÖ® ¤Ó Fmh¨ ö£õ¸mPÒ ö\›zu¼À ¤zu}º GÆÁõÖ
EuÄQßÓx ?

How bile helps in digestion of fats and other nutrients of food ?

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 10 of 12

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¤›Ä - 4 / SECTION - 4

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 2x5=10

Note : Answer all the questions.

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20. (A) uÁøÍÍ°ß ö£s CÚ¨ö£¸UP ©sh»zøu ÂÍUSP.
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AÀ»x
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(B) ABO

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Cµzu ÁøPø¯ ÂÍUSP.
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(a)

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Explain the female reproductive system of frog.

OR

(b) Explain ABO Blood group.

21. (A) Sa] ©ØÖ® T®¦ ö\ÀPøÍ ÷ÁÖ£kzxP.
AÀ»x
(B) ÷uÜUPÎß \‰P Pmhø©¨ø£ ÂÍUSP.
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(a) Differentiate between Rod and Cone cells.

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OR

(b)
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Explain the social organisation of Honey Bees.

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a - o O o -

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[ v¸¨¦P / Turn over

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