TN 11th Question Paper 2025 Biology

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No. of Printed Pages : 11
8427
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!8427IstYearBiology! PART - III
E°›¯À / BIOLOGY
( 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 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®.
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.

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

¤›Ä - 1 / SECTION - 1

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

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

8427 2

1. C¸£UPa ^º Aø©¢u ø\¯õzv¯® ©g\›US Kº GkzxUPõmk :
(A) QÎ÷µõöhßmµõß (B) B]©®
(C) ö£i÷»¢uì (D) ³L÷£õº¤¯õ
An example for Zygomorphic Cyathium inflorescence :
(a) Clerodendron (b) Ocimum
(c) Pedilanthus (d) Euphorbia

2. C¸£UP J¸[Pø©¢u ÁõìS» PØøÓ __________ À Põn¨£kQÓx.
(A) iµ]Úõ (B) SUPº¤m÷h]
(C) ³UPõ (D) ¼À¼÷¯]
Bicollateral Vascular bundles are present in __________.
(a) Dracena (b) Cucurbitaceae
(c) Yucca (d) Lilliaceae

3. Áõm\ß ©ØÖ® Q›UQß Cµmøh _¸Ò DNA ©õv› __________ ÁøP¯õÚx.
(A) H (B) A
(C) B (D) C
Watson and Crick Model of DNA double helix is __________ form.
(a) H (b) A
(c) B (d) C

4. _Áõ\z uͨö£õ¸Ò ¦µu® GÛÀ, _Áõ\ DÂß ©v¨¦ :
(A) 0.7 (B) ∞
(C) 1.33 (D) 0
If respiratory substrate is protein, RQ (Respiratory Quotient) value is :
(a) 0.7 (b) ∞
(c) 1.33 (d) 0

A

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5. £À÷ÁÖ ÁøP¨£mh uõÁµ ÷|õö¯vº¨¦ ©sh»zvß JØÖø©PÒ ©ØÖ®
÷ÁØÖø©PÒ Ah[Q¯ ÁøP¨£õk :
(A) F}º\õº ÁøP¨£õk
(B) ÷Áv¯ ÁøP¨£õk
(C) Gso¯À ÁøP¨£õk
(D) ‰»UTÖ ÁøP¨£õmk Aø©¨¦ •øÓ
The taxonomy which involves the similarities and dissimilarities among the immune system
of different taxa is termed as :

(a) Serotaxonomy

(b) Chemotaxonomy

(c) Numerical taxonomy

(d) Molecular Systematics

6. TØÖ I : Á\¢u Põ»U Pmøh Ahº {Ó•® SøÓÁõÚ Ahºzv²® öPõshx.
TØÖ II : £µÁÀ xøÍUPmøh Bsk •ÊÁx® J÷µ ^µõÚ Põ»{ø» EÒÍ
Ch[PÎÀ ÷uõßÖQÓx.
(A) TØÖ I uÁÓõÚx BÚõÀ TØÖ II \›¯õÚx
(B) Cµsk TØÖPЮ \›¯õÚx
(C) TØÖ I \›¯õÚx BÚõÀ TØÖ II uÁÓõÚx
(D) Cµsk TØÖPЮ uÁÓõÚx
Statement I : Spring wood is darker in colour and has lower density.

Statement II : Diffuse porous wood is formed where the climatic conditions are
uniform throughout the year.

(a) Statement I is wrong but Statement II is correct

(b) Both statements are correct

(c) Statement I is correct but Statement II is wrong

(d) Both statements are wrong

A [ v¸¨¦P / Turn over

8427 4

7. \›¯õP ö£õ¸¢v²ÒÍøuz ÷uº¢öuk.
(1) ©Ûua ]Ö}º (i) BU]ß B
(2) ©UPõa÷\õÍ Gsön´ (ii) GA3

(3) §gø\PÒ (iii) BU]ß A
(4) öíº›[ «ß ¢x (iv) øPÚiß
(A) (1) - (iii), (2) - (i), (3) - (ii), (4) - (iv)
(B) (1) - (iii), (2) - (iv), (3) - (i), (4) - (ii)
(C) (1) - (ii), (2) - (iii), (3) - (iv), (4) - (i)
(D) (1) - (iv), (2) - (i), (3) - (ii), (4) - (iii)
Select the correctly matched one.

(1) Human Urine (i) Auxin - B

(2) Corn gram oil (ii) GA3

(3) Fungus (iii) Auxin - A

(4) Herring fish sperm (iv) Kinetin

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

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

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

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

8. G¨¤›Ä uõÁµ® K[Q¯ ÷P«mhP uõÁµ \¢uvø¯U öPõshx ?
(A) â®÷Úõìö£º®PÒ (B) öh›÷hõLø£mPÒ
(C) Bg]÷¯õìö£º®PÒ (D) ¤øµ÷¯õLø£mPÒ
Which of the plant group has gametophyte as a dominant phase ?

(a) Gymnosperms (b) Pteridophytes

(c) Angiosperms (d) Bryophytes

A

5 8427

¤›Ä - 2 / SECTION - 2

SÔ¨¦ : GøÁ÷¯Ý® |õßS ÂÚõUPÐUS Âøh¯ÎUPÄ®. 4x2=8
Note : Answer any four questions.

9. H÷uÝ® Cµsk ]Ó¨¦ ÁøP ©g\›°ß ÁøPPøÍ GÊuÄ®.
Write any two types of special inflorescence.

10. {³UÎ÷¯õø\k ©ØÖ® {³UÎ÷¯õøhk – ÷ÁÖ£kzxP.
Differentiate - Nucleoside and Nucleotide.

11. øh÷»õìPÒ £ØÔ ]Ö SÔ¨¦ GÊxP.
Write short notes on Tyloses.

12. }µõ¨÷£õUQß ÁøPPøÍU SÔ¨¤kP.
Mention the types of Transpiration.

13. PõØ×hP Áͺ¨¦ GßÓõÀ GßÚ ?
What is Aeroponics ?

14. D÷Úõ÷»\ß – Áøµ¯ÖUPÄ®.
Define Enolation.

¤›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. ¨öÍU÷hõìjÀ GßÓõÀ GßÚ ? GkzxUPõmk u¸P.
What is Plectostele ? Give an example.

A [ v¸¨¦P / Turn over

8427 6

16. SkøÁz uõÁµzvøÚ £ØÔ ]Ö SÔ¨¦ GÊuÄ®.
Write short notes on Pitcher plant.

17. uõÁµa ö\ÀPξ® »[S ö\ÀPξ® EÒÍ ø\m÷hõøPÚ]øé ÷ÁÖ£kzxP.
Differentiate Cytokinesis in plant cells and animal cells.

18. vÓ¢u ÁõìS»U PØøÓ°ß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw and label the parts of open vascular bundle.

19. vmhªh¨£mh ö\À CÓ¨¦ (PCD) £ØÔ ]Ö SÔ¨¦ u¸P.
Give a brief account on Programmed Cell Death (PCD).

¤›Ä - 4 / SECTION - 4

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 2x5=10
Note : Answer all the questions.

20. (A) Qµõ® ÷|º, Qµõ® Gvº £õUj›¯[PøÍ ÷ÁÖ£kzuÄ®.
AÀ»x
(B) L÷£÷£] Sk®£zvß H÷uÝ® I¢x ö£õ¸Íõuõµ •UQ¯zxÁzøu GÊxP.
(a) Differentiate between Gram positive and Gram negative bacteria.
OR
(b) Write any five economic importance of family Fabaceae.

21. (A) £_[PoPzvß Aø©¨¤øÚ £hzxhß ÂÍUSP.
AÀ»x
(B) C4 _ÇØ]ø¯ ÂÍUSP (ÂÍUP® AÀ»x Áøµ£h®).
(a) Explain the structure of Chloroplast with diagram.
OR
(b) Explain C4 Cycle (Explanation or Flow chart).

A

7 8427

£Sv & II (E°›&»[Q¯À) / PART - II (BIO-ZOOLOGY)
(©v¨ö£sPÒ : 35) / (Marks : 35)

¤›-Ä & 1 / SECTION - 1
SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 8x1=8
(ii) öPõkUP¨£mkÒÍ |õßS ©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.

1. \›¯õP ö£õ¸zu¨£mkÒÍ Cønø¯ ÷uºÄ ö\´P.
(A) C¸ÁøP & öÁÒøÍ ¤Î©z µõU
(B) •møh°k£øÁ & ¤µ®©õ
(C) A»[Põµ ÁøP & ]ÀUQ
(D) PÔU÷PõÈ ÁøP & ö»Uíõºß
Choose the correctly matched pair.
(a) Dual purpose - White Plymouth rock
(b) Egg layers - Brahma
(c) Ornamental breeds - Silkie
(d) Broiler types - Leghorn

2. RÌUPshÁØÔÀ JßøÓz uµ «v ©¯¼ß EøÓ²hß öuõhº¦øh¯x. A¢u
JßÖ Gx ?
(A) |µ®¦z yshÀ Phzu¾UPõP BØÓÀ öÁΨ£õk AvP›zuÀ.
(B) |µ®¦z yshÀ ÂøµÁõPU Phzu¨£k®.
(C) ö\¯À ªßÚÊzu® uõÄuÀ ÁÈ Phzu¨£kQÓx.
(D) µõ߯º Pq BUéõßPÎÀ B[Põ[÷P CøhöÁÎPøÍ HØ£kzxQßÓÚ.
All of the following are associated with the myeline sheath except :
(a) Increased energy output for nerve impulse conduction
(b) Faster conduction of Nerve impulses
(c) Saltatory conduction of action potential
(d) Nodes of Ranvier forming gaps along the axon

A [ v¸¨¦P / Turn over

8427 8

3. RÌUPshÁØÖÒ £õ¿miPÎÀ Põn¨£hõu £s¦ Gx ?
(A) ~©õmiU G¾®¦ (B) wU÷Põhõßm £ØPÒ
(C) ö©mhõö|L¨›U ]Ö}µP® (D) £õÀ _µ¨¤PÒ
Which one of the following characteristic feature is not found in Mammals ?
(a) Pneumatic bones (b) Thecodont teeth
(c) Metanephric kidney (d) Mammary glands

4. "v_ vµÁ®' GßÖ AøÇUP¨£k® Cøn¨¦ v_ Gx ?
(A) öµmiS»õº v_ (B) H›÷¯õ»õº v_
(C) AhºÁõÚ ^µõÚ v_ (D) Ai¨÷£õì v_
Which one of the connective tissue is aptly called ‘Tissue Fluid’ ?
(a) Reticular Tissue (b) Areolar Tissue
(c) Dense Regular Tissue (d) Adipose Tissue

5. Cµzuzvß ‰»® ~øµ±µ¾USa ö\À¾® Põº£ß øh BUø\iß {ø» :
(A) Põº£ª÷Úõ ï÷©õS÷Íõ¤ß (B) Põº£õÛU Aª»®
(C) Põº£õU] ï÷©õS÷Íõ¤ß (D) BUê ï÷©õS÷Íõ¤ß
CO2 is transported through blood to lungs as :
(a) Carbamino haemoglobin (b) Carbonic acid
(c) Carboxy haemoglobin (d) Oxyhaemoglobin

6. uÁÓõÚ Cønø¯U PshÔP.
(A) ø\m÷hõ¤Íõ\® & \õº÷Põ¤Íõ\®
(B) ö\À & uø\°øÇ
(C) Gs÷hõ¤Íõ\ Áø»¨¤ßÚÀ & \õºU÷Põ¤Íõ\ Áø»¨¤ßÚÀ
(D) ¤Íõì©õ \ÆÄ & {³›ö»®©õ
Find out the wrongly matched pair.
(a) Cytoplasm - Sarcoplasm
(b) Cell - Myofibril
(c) Endoplasmic reticulum - Sarcoplasmic reticulum
(d) Plasma membrane - Neurilemma

A

9 8427

7. Cµzu ~s|õÍ[PÐÒ Cµzu Kmhzvß ÷ÁP® ªPÄ® SøÓÁx Hß ?
(A) Cµzu ~s|õÍ[PÎß ö©õzu¨ £µ¨¦ ~su©ÛPÎß ö©õzu¨ £µ¨ø£
Âh¨ ö£›¯x.
(B) Á»x öÁßm›UQøÍ ÂhU SøÓ¢uÍÄ Cµzu öÁÎ÷¯ØÓzøuU öPõsh
Chx öÁßm›UQÒ ‰»® ]ìhªU Cµzu ~s|õÍ[PÐUS Cµzu®
AÎUP¨£kÁuõÀ.
(C) Cµzu |õÍ[PÎß _Áº ö\ÀPÐUSÒ BUêáøÚ¨ £›©õÖ® AÍÂØS
ö©À¼¯uõP CÀø».
(D) Cµzu ~s|õÍ[PÒ Cu¯zøu Âmkz uÒΰ¸¨£uõÀ Cµzu Kmh®
ö©xÁõP |øhö£ÖQÓx.
Why is the velocity of blood flow the lowest in the capillaries ?
(a) The total surface area of the capillaries is larger than the total surface area of the
arterioles.
(b) The systemic capillaries are supplied by the left ventricle, which has a lower cardiac
output than the right ventricle.
(c) The capillary walls are not thin enough to allow oxygen to exchange with the cells.
(d) Capillaries are far from the heart and blood flow slows as distance from the heart
increases.

8. ]Ö}µP ~sSÇÀPÎÀ }º «Í EÔg\¨£ku¾US EuÄ® íõº÷©õß :
(A) Bßi øh³›miU íõº÷©õß
(B) ÷Põ¼]ì÷hõøPÛß
(C) £õßQ›÷¯õø\ªß
(D) Bg]÷¯õöhß]ß II
The hormone which helps in the reabsorption of water in kidney tubules is :
(a) Antidiuretic hormone
(b) Cholecystokinin
(c) Pancreozymin
(d) Angiotensin II

¤›Ä - 2 / SECTION - 2
SÔ¨¦ : GøÁ÷¯Ý® |õßS ÂÚõUPÐUS Âøh¯ÎUPÄ®. 4x2=8
Note : Answer any four questions.

9. ]ØÔÚU ÷Põm£õmiÀ \õº»ì hõºÂÛß £[S ¯õx ?
What is the role of Charles Darwin in relation to concept of species ?

10. G¾®¦ «ßPÎß H÷uÝ® Cµsk £s¦PøÍU SÔ¨¤kP.
List any two features that characterise bony fishes.

A [ v¸¨¦P / Turn over

8427 10

11. ©s¦ÊUPÒ GÆÁõÖ _Áõ]UQßÓÚ ?
How do earthworms breathe ?

12. E°º¨¦zvÓß – Áøµ¯ÖUPÄ®.
Define Vital Capacity.

13. «sk® EÔg\¨£kuÀ ö|¨LµõÛß G¨£Sv°À AvP©õP |øhö£ÖQÓx ?
In which segment of the nephron most of the reabsorption of substances takes place ?

14. ìjµõ´k íõº÷©õßPÒ H÷uÝ® |õßQß ö£¯›øÚ £mi¯¼kP.
List out the names of any four Steroid hormones.

¤›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. «ßPÎÀ Põn¨£k® PõØÖ¨ ø£PÎß £oPøÍU SÔ¨¤kP.
Mention the functions of air bladder in fishes.

16. uõÁµ EsoPÎÀ ShÀ¤xUP¨£Sv²®, ShÀÁõÀ £Sv²® ªP¨ ö£›¯uõP
Aø©¢xÒÍx. Hß ?
In Herbivorous animal both Caecum and Vermiform appendix are larger in size. Why ?

17. £miß ö£õ¸Íõuõµ •UQ¯zxÁzøuU TÖP.
Give the economic importance of Silk.

18. Am›Ú¼ß íõº÷©õß £oPÒ H÷uÝ® ‰ßÔøÚ £mi¯¼kP.
List out any three functions of adrenalin hormone.

19. vµÁ ‰mkPÎß ÁøPPÒ H÷uÝ® ‰ßøÓ GkzxUPõmkPÐhß GÊxP.
Write any three types of Synovial joints with examples.

A

11 8427

¤›Ä - 4 / SECTION - 4

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

Note : Answer all the questions.

20. (A) uÁøÍ°ß ö\›©õÚ ©sh»zøu £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.

AÀ»x

(B) ]øuÁøh¢u CµzuU SÇõ°À |øhö£Ö® Cµzu® EøÓuø» ÂÍUS®
öuõhº Áøµ£h® Áøµ¯Ä®.
(a) Draw a neat labelled diagram of the Digestive system of frog.

OR

(b) Draw Flow Chart of Blood Coagulation in an injured Blood Vessel.

21. (A) Psoß JλPÀ SøÓ£õkPÍõÚ ø©÷¯õ¨¤¯õ, (Qmh¨£õºøÁ)
øí¨£ºö©m÷µõ¨¤¯õøÁ (yµ¨£õºøÁ) ÂÍUQ AuøÚ \› ö\´²®
•øÓPøÍ £hzxhß ÂÁ›.

AÀ»x

(B) «ßPÎß EnÅmh ©v¨¦PÒ ¯õøÁ ?
(a) Explain the Refractive errors of eye such as Myopia, Hypermetropia and write the
corrective measures with diagram.

OR

(b) What are the Nutritive values of fishes ?

-oOo-

A [ v¸¨¦P / Turn over

Study Materials
Notes

Model Papers Class 6 Notes

Sample Papers Class 7 Notes
Half Yearly Sample Papers Class 8 Notes

Class 9 Notes
Important Resources
Class 10 Notes
Periodic Table
Class 11 Notes
Writing Skills / Formats

Maps of India / World Class 12 Notes

Books and Solutions

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RD Sharma Solutions
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