TN 12th Question Paper 2023 Biology

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 11
6627
£vÄ Gs
A Register Number

!6627Biology! 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 ©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.

[ v¸¨¦P / Turn over

6627 2

1. PõkPÒ AÈzuÀ Gøu •ßÛÖzva ö\ÀÁvÀø» ?
(A) ©õØÔ¯ø©UP¨£mh EÒѺ ÁõÛø»
(B) ÷ÁP©õÚ Fmha\zx _ÇØ]
(C) C¯ØøP ÁõÈh ÁõÛø» {ø» AÈuÀ
(D) ©s A›¨¦
Deforestation does not lead to __________.
(a) alteration of local weather conditions
(b) quick nutrient cycling
(c) destruction of natural habitat weather conditions
(d) soil erosion

2. H»UPõ´ __________ Sk®£zøua ÷\º¢ux.
(A) ö\õ÷»÷Ú] (B) ø£¨£÷µ]
(C) L÷£÷£] (D) âßâö£÷µ]
Cardamom belongs to the family __________.
(a) Solanaceae (b) Piperaceae
(c) Fabaceae (d) Zingiberaceae

3. \õS£iUS HØÓ ©s ÁøP :
(A) £\ø» ©s (B) PÎ ©s
(C) ©nÀ (D) ÁshÀ ©s
The ideal soil for Cultivation is :
(a) Loamy soil (b) Clayey soil
(c) Sandy soil (d) Silt soil

4. øÁµì AØÓ uõÁµ[PÒ __________ À C¸¢x E¸ÁõUP¨£kQßÓÚ.
(A) BUSzv_ Áͺ¨¦ (B) ö\À ªuøÁ Áͺ¨¦
(C) ¦÷µõm÷hõ¤Íõìm Áͺ¨¦ (D) EÖ¨¦ Áͺ¨¦
Virus free plants are developed from :
(a) Meristem culture (b) Cell suspension culture

(c) Protoplast culture (d) Organ culture

A

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5. __________ ""C¢v¯ £_ø©¨ ¦µm]°ß u¢øu'' GÚ AøÇUP¨£kQÓõº.

(A) M.S. _Áõª|õuß (B) P. ©÷PìÁ›
(C) ö©shÀ (D) ö|À ö᯵õ©ß
__________ is called as “Father of Indian Green Revolution”.
(a) M.S. Swaminathan (b) P. Maheswari

(c) Mendel (d) Nel Jayaraman

6. öhL¨÷µõ]¯õ ö£º¤³›¯õ J¸ __________.
(A) E°› PøÍUöPõÀ¼ (B) E°› Eµ®
(C) uøÇ Eµ® (D) E°› §a]UöPõÀ¼
Tephrosia purpurea is a __________.
(a) Bio-herbicide (b) Bio-fertilizer

(c) Green manure (d) Bio-pesticide

7. öPõkUP¨£mkÒÍÁØÔÀ Gx ö£¸ ÷PªmhPz uõÁµzøuU SÔUQÓx ?
(A) `À v_ (B) `À
(C) P¸Ås v_ (D) P¸¨ø£
Which of the following represent Megagametophyte ?

(a) Nucellus (b) Ovule

(c) Endosperm (d) Embryo sac

8. ©Sh PÇø»ø¯ EshõUS® £õUj›¯õ :
(A) Gìö\›a]¯õ ÷Põø» (B) ÷£]À»ì \¨i¼ì
(C) ÷£]À»ì x›g]ö¯ß]ì (D) AU÷µõ £õUj›¯® i²ª÷£]¯ßì
The bacteria responsible for causing Crown Gall :
(a) Escherichia coli (b) Bacillus subtilis

(c) Bacillus thuringiensis (d) Agrobacterium tumefaciens

A [ v¸¨¦P / Turn over

6627 4

¤›Ä - 2/SECTION - 2

SÔ¨¦ : RÌUPõq® ÂÚõUPÎÀ H÷uÝ® |õßS ÂÚõUPÐUS Âøh¯ÎUPÄ®.
4x2=8
Note : Answer any four of the following questions.

9. ì÷hõª¯® GßÓõÀ GßÚ ?

What is Stomium ?

10. Cøn ÷\ºu¼ß ÁøPPøÍz u¸P.

Give the types of Synapsis.

11. ©µ£q ©õØÓzvØS £¯ß£kzu¨£k® ÷Áv¨ ö£õ¸mPÎß ö£¯ºPøÍU TÖP.

Name the chemicals used in Gene Transfer.

12. PAR – GßÓõÀ GßÚ ?

What is PAR ?

13. •uÀ{ø» AÔ•P¨£kzxuø» Cµshõ®{ø» AÔ•P¨£kzxu¼¼¸¢x
÷ÁÖ£kzxP.

Differentiate Primary introduction from Secondary introduction.

14. Tmk¨ £›nõ©® GßÓõÀ GßÚ ?

What is Co-evolution ?

A

5 6627

¤›Ä - 3/SECTION - 3

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

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

15. JmkuÀ ©ØÖ® £v¯ªhÀ – ÷ÁÖ£kzxP.

Differentiate Grafting and Layering.

16. ©i¯zvß •UQ¯zxÁ[PÒ GøÁ÷¯Ý® ‰ßÔøÚ¨ £mi¯¼kP.

List any three significance of ploidy.

17. ÁoP ÷ÁÍõs Põk Áͺ¨¦ ‰»® ÁͺUP¨£k® uõÁµ[PÐUS |õßS
GkzxUPõmkPøÍz u¸P.

Give four examples for plants cultivated in commercial agroforestry.

18. ìø£¸¼Úõ ÷£õßÓ ~sq°ºPøÍ Áͺ¨£uØS G¢u ö£õ¸mPÒ £¯ß£kzu¨&
£kQÓx ?

What are the materials used to grow micro-organism like Spirulina ?

19. E°› PsPõo¨¦ £ØÔ ]Ö SÔ¨¦ GÊxP.

Write short notes on Bio-monitoring.

A [ v¸¨¦P / Turn over

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¤›Ä - 4/SECTION - 4

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

Note : Answer all the questions.

20. (A) PõØÖ ©Pµ¢ua ÷\ºUøP ©»ºPÎÀ Põn¨£k® £s¦PÒ ¯õøÁ ?

AÀ»x

(B) •Êø©¯ØÓ K[Szußø©ø¯ GkzxUPõmkhß ÂÍUSP.

(a) Give the characteristic features of Anemophilous plants.

OR

(b) Explain the incomplete dominance with example.

21. (A) ÁÓsh {»z uõÁµ[PÎß EÒÍø©¨¦ uPÁø©¨¦PøÍ GÊxP.

AÀ»x

(B) }¯Ô¢u H÷uÝ® C¸ uõÁµ[PÎß ö\¯»õUP ‰»©¸¢x ©ØÖ® ©¸zxÁ
•UQ¯zxÁzøuz u¸P.

(a) Enumerate the anatomical adaptations of Xerophytes.

OR

(b) Give an account of active principle and medicinal values of any two plants

you have studied.

A

7 6627

£Sv & II/PART-II
(E°› & »[Q¯À)/(BIO-ZOOLOGY)
(©v¨ö£sPÒ : 35)/(Marks : 35)
¤›Ä - 1/SECTION - 1
SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 8x1=8
(ii) öPõkUP¨£mkÒÍ ©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. £mhõÆ ]sm÷µõ® __________ GÚÄ® AøÇUP¨£kQÓx.
(A) 13 - iøµ÷\õª (B) 18 - iøµ÷\õª
(C) hºÚº ]sm÷µõ® (D) 21 - iøµ÷\õª
Patau’s Syndrome is also referred to as :
(a) 13 - Trisomy (b) 18 - Trisomy

(c) Turner’s Syndrome (d) 21 - Trisomy

2. ö£Ø÷Óõº Eh¼ß öÁΨ£Sv°À ö©õmkPÒ E¸ÁõuÀ CÆÁõÖ AøÇUP¨&
£kQÓx :
(A) ö᮳ÀPÒ (B) AP •QÌuÀ
(C) xshõuÀ (D) ¦Ó •QÌuÀ
If Buds are formed on the outer surface of the parent body, it is called as :
(a) Gemmules (b) Endogenous budding

(c) Fragmentation (d) Exogenous budding

3. ^®£õ¼À AvP® Põn¨£kÁx :
(A) IgD (B) IgE (C) IgM (D) IgA
Colostrum is rich in :

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

A [ v¸¨¦P / Turn over

6627 8

4. CßhºLö£µõßPÒ Gߣx :
(A) E°º Gvº ö£õ¸mPÒ
(B) £õUj›¯ Gvº¨¦¨ ö£õ¸mPÒ
(C) §gø\ Gvº¨¦¨ ö£õ¸mPÒ
(D) øÁµì Gvº¨¦¨ ö£õ¸mPÒ
Interferons are :
(a) anti-biotics
(b) anti-bacterial substances
(c) anti-fungal substances
(d) anti-viral substances

5. P¸zuøh ©õzvøµPÎÀ Põn¨£kÁx :
(A) ›»õUêß ©ØÖ® ¦÷µõ»õUiß
(B) ¦÷µõöáìi÷µõß ©ØÖ® Dìm÷µõáß
(C) ¦÷µõöáìi÷µõß ©ØÖ® ›»õUêß
(D) Dìm÷µõáß ©ØÖ® ›»õUêß
Contraceptive pills contain :
(a) Relaxin and prolactin
(b) Progesterone and estrogen
(c) Progesterone and relaxin
(d) Estrogen and relaxin

6. ©ÛuÛÀ ÷\ØÖ¨¦søn HØ£kzxÁx :
(A) ¦÷µõm÷hõ÷\õÁõ (B) øÁµì
(C) §gø\ (D) £õUj›¯õ
The Athlete’s foot disease in human is caused by :
(a) Protozoa (b) Virus
(c) Fungi (d) Bacteria

7. ÁõÈh ^µÈÂÚõÀ ªP Pkø©¯õÚ £õv¨¦PÐUS EÒÍõQ AȲ® {ø»°À
EÒÍ Â»[QÚ® :
(A) C¸ÁõÌÂPÒ (B) £õ¿miPÒ
(C) •m÷uõ¼PÒ (D) £ÓøÁPÒ
The animals that are at high risk of extinction due to habitat destruction is :

(a) Amphibians (b) Mammals
(c) Echinoderms (d) Birds

A

9 6627

8. xoPÎÀ £i¢u Gsön´ PøÓPøÍ }UP¨ £¯ß£k® ö|õv :
(A) ö\À¾÷»ì (B) ö£Ui÷Úì
(C) ¦÷µõmi÷¯ì (D) ¼¨÷£ì
Enzyme used for removing oily stains from the clothes :
(a) Cellulase (b) Pectinase
(c) Protease (d) Lipase

¤›Ä & 2/SECTION - 2
SÔ¨¦ : H÷uÝ® |õßS ÂÚõUPÐUS ©mk® Âøh¯ÎUPÄ®. 4x2=8
Note : Answer any four of the following questions.

9. P¸¨ø£a _Á›ß ‰ßÖ AkUSPÒ ¯õøÁ ?
What are the three layers of uterine wall ?

10. ©µ£qU SÔ±miÀ ö£õ¸ÍØÓ SÔ±kPÒ GÚ AøÇUP¨£k£øÁ ¯õøÁ ?
Which are called as non-sense codons in genetic code ?

11. S £›nõ©®, › £›nõ©® – ÷ÁÖ£kzxP.
Differentiate Convergent Evolution and Divergent Evolution.

12. øÁµìPÒ ‰»® ©ÛuºPÐUS HØ£k® ÷|õ´PÒ GøÁ÷¯Ý® |õßQß
ö£¯ºPøÍU TÖP.
Name any four human viral diseases.

13. ›ÁõUP® u¸P.
(A) CFC
(B) PAN
Give the expansion of :
(a) CFC
(b) PAN

14. SøÓöÁ¨£ ÷ÁÖ£õkøh¯ E°›Ú[PÒ GߣøÁ ¯õøÁ ? GkzxUPõmkPÒ
u¸P.

What are Stenotherms ? Give examples.

A [ v¸¨¦P / Turn over

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¤›Ä & 3/SECTION - 3

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

Note : Answer any three of the following questions. Question number 19 is
Compulsory.

15. CǨ¦ «mhÀ GßÓõÀ GßÚ ? GkzxUPõmk u¸P.

What is meant by regeneration ? Give example.

16. S÷µõ÷©õ÷\õ® öuõS¨¦ Áøµ£hzvß £¯ßPÒ GøÁ÷¯Ý® ‰ßÔøÚ GÊxP.

Mention any three applications of karyotyping.

17. JØøÓ ö\À ¦µu® GßÓõÀ GßÚ ? AÁØÔß £¯ßPøÍ GÊxP.

What is single cell protein ? Write its uses.

18. `ÇÀ EÒ £õxPõ¨¤ØS®, `ÇÀ öÁÎ £õxPõ¨¤ØS® Cøh÷¯ EÒÍ
÷ÁÖ£õkPÒ ¯õøÁ ?

What are the differences between in-situ and ex-situ conservation ?

19. •vº E°› v_UPøÍ ¦x¨¤UP EuÄ® £ÀvÓß öPõsh ö\ÀPÒ ¯õøÁ ?
AÁØÔß AvP EØ£zvUPõÚ ‰»õuõµ® Gx ?

What are the multipotent cells involved in replenishing adult tissue ? What is
the rich source for it ?

A

11 6627

¤›Ä & 4/SECTION - 4

SÔ¨¦ : ¤ßÁ¸® ÂÚõUPÐUS Âøh¯ÎUPÄ®. 2x5=10

Note : Answer the following questions.

20. (A) ©Ûu ¢x ö\À¼ß Aø©¨ø£¨ £hzxhß ÂÁ›UPÄ®.

AÀ»x

(B) C®²÷ÚõS÷Íõ¦¼ß Aø©¨ø£ uS¢u £hzxhß ÂÍUSP.

(a) Describe the structure of human sperm with a neat labelled diagram.

OR

(b) Explain the structure of immunoglobulin with suitable diagram.

21. (A) ¦µu EØ£zv°À, Aª÷Úõ Aª»[PøÍ PhzxÁvÀ •UQ¯ £[S ÁQUS®
RNA &øÁ £hzxhß ÂÍUSP.

AÀ»x

(B) E°›¯ £ÀÁøPzußø©°ß CǨ¤ØS •UQ¯ Põµn©õÚ ©Ûu
ö\¯À£õkPøÍ Á›ø\¨£kzxP.

(a) Explain the structure of RNA which plays a vital role in protein synthesis by
transferring amino acids with diagram.

OR

(b) List out the human activities causing biodiversity loss.

-oOo-

A [ v¸¨¦P / Turn over