TN 12th Question Paper 2022 Biology

No. of Printed Pages : 11
5927
£vÄ Gs
A Register Number

!5927Biology! 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

5927 2

1. DNA &øÁ D÷Põ› xs-iU-S-ª-h® :
(A) GAATTC (B) AGGGTT (C) TATAGC (D) GTATATC
EcoRI cleaves DNA at :
(a) GAATTC (b) AGGGTT (c) TATAGC (d) GTATATC

2. ö£hõ-öá-Û-]ì (Pedogenesis) Gß-£x G-u-Ý-hß öuõ-hº-¦-øh-¯x ?
(A) E°-›z öuõ-øP (B) öuõÀ-¾-°› £i-Á®
(C) ©s (D) }º
Pedogenesis refers to :
(a) Population (b) Fossils
(c) Soil (d) Water

3. öhU-÷hõ-Úõ Qµõs-iì Gß-£-x __________ Sk®-£z-v-ß uõ-Á-µ®.
(A) i¨-j-÷µõ-Põº-÷£-] (B) ÷»ª-÷¯-]
(C) G¤-÷Ú-] (D) ÷£÷£-]
Tectona grandis is coming under the family :
(a) Dipterocaipaceae (b) Lamiaceae
(c) Ebenaceae (d) Fabaceae

4. Põ-k-PÒ AÈU-P¨-£-k-uÀ GÚ¨-£-k-Áx :
(A) SÍ[-P-ÎÀ ÁÍ-¸® uõ-Á-µ[-PÒ ©Ø-Ö® ©µ[-PÒ
(B) Põ-k-PÍØÓ £S-v-P-ÎÀ ÁÍ-¸® uõ-Á-µ[-PÒ ©Ø-Ö® ©µ[-PÒ
(C) uõ-Á-µ[-PÒ ©Ø-Ö® ©µ[PÒ BQ-¯-ÁØøÓ APØ-Ö-uÀ
(D) Põ-k-PÒ AÈ¢u £S-v-P-ÎÀ ÁÍ-¸® uõ-Á-µ[-PÒ ©Ø-Ö® ©µ[-PÒ
Deforestation means :
(a) growing plants and trees in a pond.
(b) growing plants and trees in an area where there is no forest.
(c) removal of plants and trees.
(d) growing plants and trees in an area where the forest is removed.

A

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5. Gz-v-i-¯® ¦÷µõ-ø©k G¢u öuõ-ÈÀ-~m£•øÓ-°À £¯-ß-£-kz-u¨-£-k-Q-Óx ?

(A) £õ-¼-©-÷µì \[-Q-¼z-öuõ-hº-Â-øÚ

(B) \uºß JØ-Ô-ö¯-k¨¦ öuõ-ÈÀ-~m£•øÓ

(C) AP-÷µõì CÊ-© ªß-ÚõØ ¤›¨-¦

(D) öÁì-hºß JØ-Ô-ö¯-k¨¦ öuõ-ÈÀ-~m£•øÓ

In which techniques Ethidium Bromide is used ?

(a) Polymerised Chain Reaction

(b) Southern Blotting Techniques

(c) Agarose Gel Electrophoresis

(d) Western Blotting Techniques

6. ‰k-Â-øuz uõ-Á-µ[-P-ÎÀ Bs ÷P-ªm-h-Pz uõ-Á-µz-vß •uÀ ö\À :

(A) Em-P-¸ (B) ~s Âz-x

(C) •uÀ-{ø» P¸-Ås-v-_ (D) ö£¸-Âz-x

The first cell of male gametophyte in angiosperm is :

(a) Nucleus (b) Microspore

(c) Primary Endosperm Nucleus (d) Megaspore

7. K[-S-ußø© ©øÓz-u-¼ß ÂQ-u-©õ-Úx :

(A) 9 : 3 : 4 (B) 9 : 3 : 3 : 1 (C) 9 : 6 : 1 (D) 12 : 3 : 1

The Dominant Epistasis ratio is :

(a) 9:3:4 (b) 9:3:3:1 (c) 9:6:1 (d) 12 : 3 : 1

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8. J÷µ µPz uõ-Áµ- [-PÐ
- U-Qø
- h÷¯ P»¨¦ ö\´-Áx __________ GÚ AøÇU-P¨-£k
- Q
- Ó
- x
- .
(A) J÷µ µPz-vØ-SÒ P»¨-¦ (B) ]Ø-Ô-Ú[-P-ÐU-Q-øh÷¯ P»¨-¦
(C) ÷£›-Ú[-P-ÐU-Q-øh÷¯ P»¨-¦ (D) µP[-P-ÐUS Cøh-÷¯ P»¨-¦
Crosses between the plants of the same variety are called __________.

(a) intravarietal (b) interspecific

(c) intergeneric (d) intervarietal

¤›Ä - 2 / SECTION - 2
SÔ¨¦ : RÌU-Põ-q® ÂÚõU-P-ÎÀ H÷u-Ý® |õß-S ÂÚõU-P-ÐUS Âøh¯ÎUPÄ®.
4x2=8
Note : Answer any four of the following questions.

9. ö©À-¼÷hõ-L-¤À¼ Gß-ÓõÀ GßÚ ?
What is Mellitophily ?

10. {³U-Î-÷¯õ-øhk öuõ-hº-Á-›-ø\°ß •øÚ ©Ø-Ö® EÒÍõP Aø©¢u £õì÷£õ
øhGìhº ¤øn¨-ø£z xs-iUP G¢u ö|õ-v-Pøͨ £-¯ß-£-kz-x-Áõ´ ?
What are the enzymes you can use to cut terminal end and internal phosphodiester
bond of nucleotide sequence ?

11. ªº-ª-÷Põ-L-¤À¼ Gß-ÓõÀ GßÚ ?
What is myrmecophily ?

12. RÌU- P sh ÂÁ- µ [- P øÍU öPõsk J¸ ¤µ- ª m Áøµ¢x Ax G¢u ÁøP- ø ¯a
\õº¢-ux GÚ GÊ-x-P.
E°-›-Ú[-P-Îß Gs-oUøP öPõ-kU-P¨-£m-kÒÍ-x & £¸¢x & 50, uõ-Á-µ[-PÒ & 1000,
•¯À ©Ø-Ö® G¼ & 250+250, £õ®¦ ©Ø-Ö® Knõß 100+50.
Draw a pyramid from following details and name the type of pyramid.

Quantities of organisms are given Hawks-50, Plants-1000, Rabbit and Mouse
250+250. Pythons and Lizard 100+50 respectively.

A

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13. ©s ÁÍzøu ÷©®-£k
- z-xÁ
- v
- À ~s-q°
- › Em-ö\-¾z-vP
- Ò GÆ-ÁõÖ £¯ß-£k
- Q
- ß-ÓÚ ?
How are microbial inoculants used to increase the soil fertility ?

14. C¯ØøP ÷ÁÍõs-ø©-°ß Áøµ-¯-øÓ-ø¯z u¸-P.
Give definitions for organic farming.

¤›Ä - 3 / SECTION - 3

SÔ¨¦ : RÌU-Põ-q® ÂÚõUPÎÀ H÷u-Ý® ‰ß-Ö ÂÚõU-P-ÐUS Âøh-¯-ÎU-P-Ä®.
ÂÚõ Gs 19&US Pmhõ¯©õP Âøh¯ÎUPÄ®. 3x3=9

Note : Answer any three of the following questions Q.No. 19 is compulsory.

15. h¥m-hz-vß £o-P-øͨ £m-i-¯-¼-k-P.
List out the functions of tapetum.

16. uÁ- Ö - u - » õ- P ¨ ö£õ- ¸ Ò- £ - k ® ©Ø- Ö ® ö£õ- ¸ - Ð - n ºz- u õu \k- v - © õØ- Ó z- v ØS
Cøh-÷¯-¯õÚ ÷ÁÖ-£õk GßÚ ?
What is the difference between missense and nonsense mutation ?

17. pBR 322 GÝ® Áõºz-øu-°-¼-¸¢x }º AÔ¢x öPõÒ-Áx GßÚ ?

What do you know about the word pBR 322 ?

18. Põº-£ß PÁ-µ¨-£-k-uÀ ©Ø-Ö® ÷\P-›z-uÀ (CCS) Gß-ÓõÀ GßÚ ?
What is CCS ?

19. ¦Â Áõ-È-h® ©Ø-Ö® ö\¯À Áõ-È-h® & ÷ÁÖ-£-kz-x-P.
Distinguish habitat and niche.

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¤›Ä - 4 / SECTION - 4

SÔ¨¦ : AøÚz-x ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 2x5=10

Note : Answer all the questions.

20. (A) P¸-Ä-ÓõU PÛ £ØÔ Â›-ÁõÚ öuõ-S¨¦ u¸-P. Auß •U-Q-¯z-x-Á® £ØÔ SÔ¨¦
÷\ºU-P.

AÀ»x

(B) •Ê-ø© ö
- £-Óõ K[-Sz-ußø© ©Ø-Ö® Cøn K[-Sz-uß-ø©ø¯ ÷ÁÖ-£k
- z-xP
- .

(a) Give a detailed account on parthenocarpy, add a note on its significance.

OR

(b) Differentiate incomplete dominance and co-dominance.

21. (A) uõ-Á-µz-v_ Áͺ¨-¤ß £¯ß-£õ-k-PøÍ GÊ-x-P.

AÀ»x

(B) |Ö-©n
- ¨ ö£õ-¸m-PÎ
- ß Aµ-\ß, Aµ-] ¯õøÁ ? AÁØ-Ôß £¯ß-PøÍ GÊ-xP
- .

(a) Write the applications of plant tissue culture.

OR

(b) What are the King and Queen of spices ? Write their uses.

A

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£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 ©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. yx RNA -‰-»U-TÖ G®-•-øÓ-°À E¸-ÁõU-P¨-£-k-Q-Óx ?
(A) |P-»õU-P® (B) Cµm-i¨-£õ-uÀ
(C) ö©õ-È- ö£-¯ºz-uÀ (D) £i-ö¯-kz-uÀ
A mRNA molecule is produced by :
(a) Duplication (b) Replication
(c) Translation (d) Transcription

2. ø\U- ÷ Íõì- ÷ £õ- › ß & A GßÓ ÷|õ´z- u - k ¨- £ õØ- Ó À JkUS ©¸¢x Gv- ¼ - ¸ ¢x
EØ-£zv ö\´-¯¨-£-k-Qß-Óx ?
(A) ö£Û-]-¼-¯® ö|õ-÷hm-h® (B) Aì-£º-âÀ-»ì ø|áº
(C) iøµ-÷Põ-öhº-©õ £õ-¼ì-÷£õ-µ® (D) ©Úõì-Pì £º-§-›-¯ì
Cyclosporin-A is an immunosuppressive drug produced from :
(a) Penicillium notatum (b) Aspergillus niger
(c) Trichoderma polysporum (d) Manascus purpureus

3. G¢uU Põ-»® "«ß-P-Îß Põ-»®' GÚ AøÇU-P¨-£-k-Q-Óx ?
(A) i÷Áõ-Û-¯ß (B) ö£º-ª-¯ß
(C) Bº-÷hõ-Â-]-¯ß (D) iøµ-¯õ-]U
Which period was called as “Age of fishes” ?
(a) Devonian (b) Permian
(c) Ordovician (d) Triassic

A [ v¸¨¦P / Turn over

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4. ]Ø-Ô-Ú[-P-ÐU-Q-øh÷¯ ÷£õmi Põ-µ-n-©õP HØ-£-k-Áx :
(A) öuõ¢-u-µÄ ÁõÌU-øP (B) E°-›Ú ©øÓÄ
(C) Tm-k-°› ÁõÌU-øP (D) vjº ©õØ-Ó®
Competition between species leads to :
(a) Amensalism (b) Extinction
(c) Symbiosis (d) Mutation

5. Áõ-Èh ^µ-È-Â-ÚõÀ ªPUPk-ø©-¯õÚ £õ-v¨-¦-P-ÐUS EÒÍõQ AÈ-²® {ø»-°À
EÒÍ Â»[-Q-Ú® Gx ?
(A) C¸-ÁõÌ-Â-PÒ (B) £õ-¿m-i-PÒ
(C) •m-÷uõ-¼-PÒ (D) £Ó-øÁ-PÒ
Which one of the following are at high risk extinction due to habitat destruction ?
(a) Amphibians (b) Mammals
(c) Echinoderms (d) Birds

6. RÌU-Psh G¢u ¦Óz-÷uõØÓ \¢-uv ö£Ø-÷Óõº-P-Îß ©µ-¦ ÁøP-¯õÚ IA IO×IA IB
PÐU-Q-øh÷¯ ¤ÓUP \õz-v-¯-ªÀø» ?
(A) A (B) AB (C) B (D) O
Which of the following phenotypes is not possible in the progeny of the parental
genotypic combination IA IO×IA IB ?
(a) A (b) AB (c) B (d) O

7. £õ-¼-©-÷µì \[-Q¼ ÂøÚ öÁ¨-£-{ø» ©õ-Ö-£õm-hõÀ 3 uÛz-uÛ {ø»-P-ÎÀ
öuõ-hº-Qß-Óx. Auß Á›ø\ :
(A) Cøn¨¦ CøÇ-£-u¨-£-kz-x-uÀ, EØ-£zv, C¯À¦ v›-¦
(B) C¯À¦ v›¦, Cøn¨¦ CøÇ-£-u¨-£-kz-x-uÀ, EØ-£z-v
(C) C¯À¦ v›¦, EØ-£z-v, Cøn¨¦ CøÇ-£-u¨-£-kz-x-uÀ
(D) EØ-£zv, Cøn¨¦ CøÇ-£-u¨-£-kz-x-uÀ, C¯À¦ v›-¦
PCR proceeds in three distinct steps governed by temperature, they are in order
of :
(a) Annealing, Synthesis, Denaturation
(b) Denaturation, Annealing, Synthesis
(c) Denaturation, Synthesis, Annealing
(d) Synthesis, Annealing, Denaturation

A

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8. •vº¢u ¢x ö\À-PÒ ÷\P-›U-P¨-£-k® Ch® :

(A) ¢-uP ÷©À _¸Ò SÇÀ (B) ¢-uP ~s S-ÇÀ-PÒ

(C) ¢-x¨-ø£ (D) ¢x |õ-Í®

The matured sperms are stored in the __________.

(a) Epididymis (b) Seminiferous tubules

(c) Seminal vesicle (d) Vas deferens

¤›Ä & 2 / SECTION - 2

SÔ¨¦ : H÷u-Ý® |õß-S ÂÚõU-P-ÐUS ©m-k® Âøh¯ÎUPÄ®. 4x2=8

Note : Answer any four of the following questions.

9. PßÛ CÚ¨-ö£-¸U-P® Gß-ÓõÀ GßÚ ? Gkz-xU-Põmk u¸-P.

What is parthenogenesis ? Give example.

10. Áõ-h-øPz uõ´ø© Gß-ÓõÀ GßÚ ?

What is surrogacy ?

11. SÔ-±mk CøÇ-°-¼-¸¢x Áõº¨-¦¸ CøÇø¯ ÷ÁÖ-£-kz-x-P.

Differentiate template strand from coding strand.

12. »õ©õºU-Qß ö£Ó¨-£mh £s-¦U ÷Põm-£õm-iøÚ uÁ-öÓ-Ú {¹-¤z-u-Áº ¯õº ?
GÆ-ÁõÖ {-¹-¤z-uõº ?

Who disproved Lamarck’s theory of acquired characters ? How ?

A [ v¸¨¦P / Turn over

5927 10

13. ¯õ-øÚU-PõÀ ÷|õ-°ß AÔ-S-Ô-PøÍ GÊ-x-P.
Write the symptoms of filariasis.

14. ©µ-£-q ]Q-a-ø\ Gß-ÓõÀ GßÚ ?
What does gene therapy mean ?

¤›Ä & 3 / SECTION - 3
SÔ¨¦ : RÌU-Põ-q® ÂÚõUPÎÀ H÷u-Ý® ‰ß-Ö ÂÚõU-P-ÐUS Âøh-¯-ÎU-P-Ä®.
ÂÚõ Gs 19&US Pmhõ¯©õP Âøh¯ÎUPÄ®. 3x3=9

Note : Answer any three of the following questions. Q.No. 19 is compulsory.

15. P¸U-öPõø» ©Ø-Ö® ]_U-öPõø» ÷ÁÖ-£-kz-x-P.
Differentiate foeticide from infanticide.

16. _¯- u - ø h- P õ¨¦ ÷|õ´ Gß- £ x vø\ ©õØ- Ó ¨- £ mh uøh- P õ¨¦ x»[- P - » õ- S ® &
{¯õ-¯¨-£-kz-x-P.
Autoimmune disease is a misdirected immunity response. Justify.

17. E°º Gvº¨-ö£õ-¸Ò Gvº¨-¦z-v-Óß G¨-ö£õ-Êx E¸-Áõ-Q-Óx ?
When does antibiotic resistance develop ?

18. CÓ¨¦ Ã-uz-øu ¤Ó¨¦ Ãuz-v-¼-¸¢x ÷ÁÖ-£-kz-x-P.
Differentiate Natality from Mortality.

19. XY S÷µõ-÷©õ-÷\õ® ÁøP £õÀ {º-n°
- z-u¼
- À Bs E°-›P- Ò J¸ X S÷µõ-÷©õ÷\õ-ø©-²®
ö£s E°-›-PÒ Cµsk X S÷µõ-÷©õ-÷\õ®-P-øÍ-²® öPõs-kÒÍÚ. £õ-¼-Úz-vØS
Cøh-÷¯-¯õÚ C¢u AÍ-Ãmk ÷ÁÖ-£õmøh E°-›-Ú® G¨-£i Dk ö\´-Q-Ó-x ?
In the XY chromosomal system of sex determination, males have only one ‘X’
chromosome, whereas females have two. How does the organism compensate for
this dosage differences between the sexes ?

A

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¤›Ä & 4 / SECTION - 4
SÔ¨¦ : ¤ß-Á-¸® ÂÚõUPÐUS Âøh¯ÎUPÄ®. 2x5=10

Note : Answer the following questions.

20. (A) ©Ûu Ash ö\À-¼ß Aø©¨-ø£¨ £hz-x-hß ÂÁ-›U-P-Ä®.
AÀ»x
(B) ©Û-u ©µ-£-q vm-hz-vß ]Ó¨-¤-¯À-¦-PÒ ¯õøÁ ?
(a) Explain the structure of Human Ovum with a neat labelled diagram.

OR

(b) Write the salient features of Human Genome Project.

21. (A) C®-³-÷Úõ-S-÷Íõ-¦-¼ß Aø©¨ø£ uS¢u £hz-x-hß ÂÍU-S-P.
AÀ»x
(B) Pv-›-¯U-PU PÈ-Ä ÷©»õsø© SÔzx Pm-køµ Áøµ-P.
(a) Explain the structure of immunoglobulin with suitable diagram.

OR

(b) Write an essay on radioactive waste management.

-o0o-

A [ v¸¨¦P / Turn over