TN 11th Question Paper 2026 Botany

FOR TN 11TH EXAM PREPARATION

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

TN 11th 2026 Question Paper Botany

Notes · Sample Papers · Previous Year Papers · Mock Tests

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PART - III

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Time Allowed : 3.00 Hours ] [ Maximum Marks : 70

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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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1. ¤›¯õßPøÍU Psk¤izuÁº ¯õº ?
(A) öh´Úº
T.O. (B) µõshÀì J.W.

(C) ÂmhõUöPº
R.H. (D) ìhõß¼ ¦¹aÚº B.

Who discovered Prions ?

(a) T.O. Diener (b) J.W. Randles

(c) R.H. Whittaker (d) Stanley B. Prusiner

2. G¨¤›Äz 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) Pteridophyte

(c) Angiosperms (d) Bryophyte

3. •øÍ÷Áº AÀ»õ©À uõÁµzvß ©ØÓ £SvPμ¸¢x E¸ÁõS® ÷ÁºPÐUS
GßÖ ö£¯º.
__________

(A) ÷ÁØÔh ÷Áº (B) Bo ÷Áº
(C) •uÀ{ø» ÷Áº (D) £UP ÷Áº
Root which develops other than from radicle is called __________.

(a) Adventitious root (b) Tap root

(c) Primary root (d) Lateral root

4. Cøn¢u `»P Cø»PÒ öPõsh `»P Ámh® __________ GÚ AøÇUP¨£k®.
(A) £» `»PCø» `»P®
(B) Cøn¢u `»PCø» `»P®
(C) Cøn¯õa `»PCø» `»P®
(D) ÷©ØTÔ¯ GxĪÀø»
Gynoecium with united carpels is termed as __________.

(a) Multicarpellary

(b) Syncarpous

(c) Apocarpous

(d) None of the above

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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
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The taxonomy which involves the similarities and dissimilarities among the immune system

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of different taxa is termed as __________.

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(a)

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Serotaxonomy

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(b)

(c)
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Chemotaxonomy

Numerical taxonomy

(d) Molecular systematics

6. S÷µõ÷©õ÷\õªß {ø»¨¦zußø©ø¯ {ºn°¨£x :
(A) \õmiø»m (B) ö\ßm÷µõª¯º
(C) j÷»õª¯º (D) øPÛm÷hõ÷Põº
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The stability of chromosome is determined by __________.

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(a) Satellite (b) Centromere

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(c) Telomere (d) Kinetochore

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7.

(A) G
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- S - G
2
- M S - M - G
1
- G
2

(C) M - G
1
- G
2
- S (D) S - G
1
- G
2
- M

The correct sequence in cell cycle is :

(a) G - S - G - M (b) S - M - G - G
1 2 1 2

(c) M - G - G - S (d) S - G - G - M
1 2 1 2

8. øPmiß Gߣx QøÍPõø\iU ¤øn¨£õÀ ¤ønUP¨£mh
β-1,4 __________

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Chitin is a linear polymer of __________ joined together by β-1,4 glycosidic linkages.

(a) α-1,4-glucan malto hydrolase

(b) β-D-glucose units

(c) D-glycuronic acid

(d) N-acetyl-D glucosamine units

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4

9. C¸£UP J¸[Pø©¢u ÁõìS» PØøÓ Põn¨£kÁx :
(A) iµ]Úõ (B) SUPº¤m÷h]
(C) ³UPõ (D) ¼À¼÷¯]
Bicollateral vascular bundles are present in :

(a) Dracena (b) Cucurbitaceae

(c) Yucca (d) Liliaceae

10. C¸Âøu°ø»z uõÁµ usiß AvP©õÚ Cµshõ® {ø» Áͺa]°ß ÷£õx
•uÀ {ø» ø\»zvß {ø» GßÚ ?
(A) |_UP¨£h»õ® AÀ»x |_UP¨£hõ©À C¸UP»õ®.
(B) ø©¯¨£Sv°À {ø»zx {ØQÓx.
(C) •uÀ {ø» L¦÷Íõ¯zøu `Ì¢xU Põn¨£h»õ®.
(D) |_UP¨£k®.
What is the fate of primary xylem in a dicot stem showing extensive secondary growth ?

(a) May or may not get crushed.

(b) It is retained in the centre of the axis.

(c) It gets surrounded by primary phloem.

(d) It gets crushed.

11. RÌPshÁØÖÒ \›¯õÚ TØÔøÚU PshÔP.
(i) A¨÷£õ¤Íõìm Gߣx ÷ÁP©õÚx, E°µØÓ £SvPÎÀ |øhö£ÖÁx.
(ii)\ÆÂøh ÁȨ£õøu ÁõUS÷Áõø» EÒÍhUQ¯x.
]®¤Íõìm A¸Pø©¢u ö\ÀPÎß ¤Íõì÷©õöhì÷©mhõUPøÍ
(iii)

CønUQÓx.
(iv)]®¤Íõìm ©ØÖ® \ÆÂøh ÁÈ BQ¯øÁ ö\À¼ß E°¸ÒÍ £SvPÎÀ
|øhö£Ö£øÁ.
(A) ©ØÖ®
(iii) (B) ©ØÖ®
(iv) (i) (ii)

(C) (D) ©ØÖ®
(i), (ii), (iii), (iv) (ii) (iii)

Which among the following is correct ?

(i) Apoplast is fastest and operates in non living part.

(ii) Transmembrane route includes vacuole.

(iii) Symplast interconnect the nearby cell through plasmodesmata.

(iv) Symplast and transmembrane route are in living part of the cell.

(a) (iii) and (iv) (b) (i) and (ii)

(c) (i), (ii), (iii) ,(iv) (d) (ii) and (iii)

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12. ö£õ¸zxP.
(1) ]mµì ~Û¯i CÓ¨¦ (i) Mo

(2) \õmøh ÁõÀ ÷|õ´ (ii) Zn

(3) ¥m¹miÀ £Ê¨¦ ø©¯U P¸UPÀ ÷|õ´ (iii) Cu

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(4) (iv) B

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

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

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

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(1)
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Match the following :

Die back disease of citrus (i) Mo
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(2)

(3)
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Whip tail disease

Brown heart diseases of Beetroot
(ii)

(iii)
Zn

Cu

(4) Little leaf (iv) B

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

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

13. C _ÇØ]°À ~øDz® JÆöÁõ¸
3
‰»UTÖUS® ÷uøÁ¨£k® CO
2
ATP ©ØÖ®
NADPH GsoUøP :
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(A) (B)
3 ATP + 2 NADPH 2 ATP + 2 NADPH

(C) (D)
3 ATP + 3 NADPH 2 ATP + 3 NADPH

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For every CO

(a)
2
molecule entering the C

3 ATP + 2 NADPH
3

lascycle, the number of ATP and NADPH required is :

(b) 2 ATP + 2 NADPH

(c) 3 ATP + 3 NADPH
ag (d) 2 ATP + 3 NADPH

14. QøÍUPõø»]ì |øhö£Ö® Ch® :
(A) £_[PoP® (B) ø\m÷hõ¤Íõ\®
(C) øµ÷£õ÷\õ® (D) ø©m÷hõPõsm›¯õ
Glycolysis takes place in :

(a) Chloroplast (b) Cytoplasm

(c) Ribosome (d) Mitochondria

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Seed dormancy allows the plants to :

(a) Reduce viability

(b) Overcome unfavourable climatic conditions

(c) Prevent deterioration of seeds

(d) Develop healthy seeds

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6

£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 questions. Question No. 24 is compulsory.

16. B´i¯ Âzx ©ØÖ® QÍõªh Âzx ÷ÁÖ£kzxP.
Differentiate Oidium and Chlamydospore.

17. QÍõª÷hõ÷©õÚõêß Aø©¨ø£ £h® Áøµ¢x £õP[PÒ SÔUPÄ®.
Draw and label the structure of Chlamydomonas.

18. Cø»zöuõÈÀ usk, SÖ Cø»zöuõÈÀ usk – ÷ÁÖ£kzxP.
Differentiate between Phylloclade and Cladode.

19. RÌPshÁØÔØS Pø»aö\õØPÒ u¸P.
(A) J¸ ÁÍ©ØÓ ©Pµ¢uzuõÒ
(B) AÀ¼ CuÌPÐhß ©Pµ¢uzuõÒPÒ Cøn¢v¸zuÀ
Give the technical terms for the following.

(a) A sterile stamen

(b) Stamens are attached to petals.

20. uõÁµ ö\À¾US®, »[S ö\À¾US® EÒÍ H÷uÝ® C¸ ÷ÁÖ£õkPøÍ GÊxP.
Write any two differences between plant cell and animal cell.

21. Hø©mhõ]ì GßÓõÀ GßÚ ?
What is meant by Amitosis ?

22. ""ö|õvPÒ'' – Áøµ¯ÖUPÄ®.
Define “Enzymes”.

23. uõÁµÂ¯¼ß£i Pmøh Gߣx GßÚ ?
What is wood botanically ?

24. uõÁµzvÀ, _U÷µõêøÚ ö£Ö® JÎa÷\ºUøP ö\´¯Â¯»õ £SvPøͨ
£mi¯¼kP.
List out the non-photosynthetic parts of a plant that need a supply of Sucrose.

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£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.

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What is Nucule ?

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26.

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÷Áº HÖöPõiPÒ GÆÁõÖ usk HÖöPõiPμ¸¢x ÷ÁÖ£kQßÓÚ ?
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How root climbers differ from stem climbers ?

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27. ÁÓm]a{ø»°À uõÁµ[PÒ GvºöPõÒЮ ö\¯¼¯À ÂøÍÄPÒ ¯õøÁ ?
What are the physiological effects of plants facing drought condition ?

28. G
0
{ø»¨£ØÔ SÔ¨¦z u¸P.
Give an account of G phase.
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29. Pmøh°ß ø©¯¨£Sv Ahº¢u {Ózxhß Põn¨£k®. Hß ?
Central part of wood is dark. Why ?

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30. }ºÁiuÀ – Áøµ¯ÖUPÄ®.
Define Guttation.

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31.

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J¸ ©µ©õÚx CµÂÀ BUêáøÚ öÁÎ÷¯ØÖQÓx. C¢u TØÔøÚ } Esø©

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GÚ |®¦QÓõ¯õ ? Eß Âøhø¯ uS¢u Põµn[PÐhß {¯õ¯¨£kzxP.
A tree is believed to be releasing oxygen during night time. Do you believe the truthfulness of

this statement ? Justify your answer by giving reasons.

32. hõmlµõ ö©mhÀ ©»º Áøµ£h® Áøµ¢x Auß ©»º `zvµzøu GÊxP.
Draw the floral diagram and write the floral formula of Datura metal.

33. EMP ÁÈzuhzvÀ Dk£k® ö|õvPÒ GøÁ÷¯Ý® ‰ßÔøÚ GÊxP.
Write any three enzymes involved in EMP pathway.

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s e Note : Answer all the questions.

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34.

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(B) }º FhP Áͺ¨¤øÚ £h® Áøµ¢x ÂÍUPÄ®.
(a) Write the outline of the life cycle of Agaricus.

OR

(b) Explain Hydroponics with the help of a diagram.

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35. (A) ]Ó¨¦ ÁøP ©g\› GßÓõÀ GßÚ ? ø\¯õzv¯® ©g\›°ß Aø©¨ø£
ÂÍUSP.
AÀ»x
(B) }›ß £s¦Pøͨ £mi¯¼kP.
(a) What is special type of inflorescence ? Explain the structure of Cyathium inflorescence.

OR

(b) List out the properties of water.

36. (A) E°›¯¨ £ÀÁøPø©ø¯¨ £õxPõ¨£vÀ uõÁµ¨ §[PõUPÎß £[S
¯õøÁ ? & ÂÁõvUPÄ®.
AÀ»x
(B) JÎa _Áõ\zvÚõÀ HØ£k® CǨ¤øÚ DkPmh ¦ØPÒ uPÁø©¨¦
~m£zvøÚ¨ ö£ØÖÒÍÚ. Cuß ö£¯º ©ØÖ® ÂÍUPzvøÚU TÖP.
(a) What are the roles of botanical gardens in conserving biodiversity ? Discuss.

OR

(b) Grasses have an adaptive mechanism to compensate photorespiratory losses. Name

and describe the mechanism.

37. (A) £_[PoPzvß Aø©¨¤øÚ £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
AÀ»x
(B) C¸Âøu°ø» ÷Á¸US®, J¸Âøu°ø» ÷Á¸US® Cøh÷¯ EÒÍ
EÒÍø©¨¤¯À ÷ÁÖ£õkPøÍ GÊxP.
(a) Draw and label the structure of Chloroplast.

OR

(b) Distinguish the anatomy of dicot root from monocot root.

38. (A) ø©m÷hõPõsm›¯õ Em\ÆÂÀ |øhö£Ö® ÂøÚPøÍ ÂÍUSP.
AÀ»x
(B) ø\m÷hõøPÛÛß Áõ̯À ÂøÍÄPÒ ¯õøÁ ?
(a) Explain the reactions taking place in mitochondrial inner membrane.

OR

(b) What are the physiological effects of Cytokinins ?

- o O o -

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