TN 12th Question Paper 2023 Botany

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 11
6632
£vÄ Gs
A Register Number

!6632Botany!
PART - III
uõÁµÂ¯À / BOTANY
( 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¨ £¯ß£kzu
÷Ásk®. £h[PÒ ÁøµÁuØS®, AiU÷PõikÁuØS® 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.

£Sv & I/PART - I
SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 15x1=15

(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

6632 2

1. ö£õ¸zxP :

(1) GU÷\õ {³UÎ÷¯ì (i) £õìL÷£møh ÷\ºzuÀ AÀ»x }USuÀ

(2) Gs÷hõ {³UÎ÷¯ì (ii) DNA xskPøÍ CønzuÀ

(3) AÀPø»ß £õìL£m÷hì (iii) ~Û¨£Sv°À DNA &øÁ xsizuÀ

(4) ø»÷Pì (iv) DNA &øÁ |kÂÀ xsizuÀ

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

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

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

(D) (1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)
Match the following :

(1) Exonuclease (i) add or remove phosphate

(2) Endonuclease (ii) binding the DNA fragments

(3) Alkaline Phosphatase (iii) cut the DNA at terminus

(4) Ligase (iv) cut the DNA at middle

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

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

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

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

2. {µ¨¦ ©µ£qUPÎß ¦Óz÷uõØÓ ÂQu® :

(A) 9 : 7 (B) 9 : 3 : 3 : 1 (C) 9 : 3 : 4 (D) 9 : 6 : 1
The phenotypic ratio of complementary genes :

(a) 9:7 (b) 9:3:3:1 (c) 9:3:4 (d) 9:6:1

A

3 6632

3. ""C¢v¯ £_ø© ¦µm]°ß u¢øu'' :
(A) Dr. M.O. £õºzu\õµv (B) Dr. ÁºRì S›¯ß
(C) Dr. M.S. _Áõª|õuß (D) Dr. M.S. \£›|õuß
‘‘ The Father of Indian Green Revolution’’ is :

(a) Dr. M.O. Parthasarathy (b) Dr. Verghese Kurien

(c) Dr. M.S. Swaminathan (d) Dr. M.S. Sabarinathan

4. ö£s ÷PªmhPz uõÁµzvß •uÀ ö\À Gx ?
(A) ~s Âzx
(B) •uÀ {ø» P¸Ås v_
(C) EmP¸
(D) ö\¯À£k® ö£¸Âzx
Which one of the following is the first cell of female gametophyte ?

(a) Microspore

(b) Primary endosperm Nucleus

(c) Nucleus

(d) Functional megaspore

5. ÷uõÀ ¦ØÖ÷|õø¯ AvP›US® {PÌÄ __________ ÁΩsh» Áõ² SøÓÄ
Põµn©õP HØ£kQÓx.
(A) ø|mµì BUøék (B) A®÷©õÛ¯õ
(C) K÷\õß (D) «z÷uß
Depletion of __________ gas in the atmosphere can lead to an increased incidence
of skin cancer.

(a) Nitrous oxide (b) Ammonia

(c) Ozone (d) Methane

A [ v¸¨¦P / Turn over

6632 4

6. RÌUPsh G¢u ©soß }º uõÁµ[PÐUS¨ £¯ß£kQÓx ?
(A) ~s¦øÇ }º (B) ¦Â Dº¨¦ }º
(C) Dµ¨£u }º (D) ÷Áv°¯À ¤øn¨¦ }º
In soil, water available for plants is :

(a) Capillary water (b) Gravitational water

(c) Hygroscopic water (d) Chemically bound water

7. ÷ÁºPhø»°ß ¤Ó¨¤h® :
(A) Áh Aö©›UPõ (B) ¤¼¨ø£ßì
(C) ¤÷µ]À (D) C¢v¯õ
Groundnut is native of __________.

(a) North America (b) Philippines

(c) Brazil (d) India

8. hõö©›ßhì CsiPõÂß ¤Ó¨¤h® :
(A) öuß Aö©›UPõ, QŸì
(B) B¨¤›UP öÁ¨£©sh»¨ £Sv
(C) C¢v¯õ ©mk®
(D) öußÛ¢v¯õ, ÿ»[Põ
Tamarindus indica is indigenous to :

(a) South America, Greece

(b) Tropical African region

(c) India alone

(d) South India, Sri Lanka

A

5 6632

9. uõÁµv_ Áͺ¨¤À vh¨£kzx® Põµo¯õP¨ £¯ß£kzu¨£kÁx :

(A) EDTA (B) {U÷PõmiÛU Aª»®

(C) APõº (D) ÷Põ£õÀmhì S÷Íõøµk

Solidifying agent used in plant tissue culture is :

(a) EDTA (b) Nicotinic acid

(c) Agar (d) Cobaltous chloride

10. uõÁµ[PÒ vÓ®£h JÎa÷\ºUøP ö\´¯ G¢u {Ó JÎUPvºPøÍ DºUQßÓÚ ?

(A) }»® ©ØÖ® £aø\ (B) }»® ©ØÖ® ]Á¨¦

(C) £aø\ ©ØÖ® CÍ® ]Á¨¦ (D) ]Á¨¦ ©ØÖ® £aø\

For efficient photosynthesis which colours of light are absorbed by the plants ?

(a) Blue, Green (b) Blue, Red

(c) Green, Pink (d) Red, Green

11. ¤ßÁ¸ÁÚÁØÖÒ Gx ©µ¤¯ ö\´v°ß \›¯õÚ Á›ø\ø¯U SÔUQÓx ?

(A) RNA → ¦µu® → DNA (B) DNA → RNA → ¦µu®

(C) ¦µu® → RNA → DNA (D) RNA → DNA → ¦µu®

Which one of the following represents the flow of genetic information ?

(a) RNA → Protein → DNA (b) DNA → RNA → Protein

(c) Protein → RNA → DNA (d) RNA → DNA → Protein

A [ v¸¨¦P / Turn over

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12. ""÷PªmkPÒ G¨ö£õÊx® P»¨¦°›PÍõP C¸¨£vÀø»'' GÝ® TØÖ :
(A) uÛzx¨ ¤›uÀ Âv (B) J[S Âv
(C) Cø¯¤»õU P¸ÄÖuÀ Âv (D) \õº¤ßÔ Jx[SuÀ Âv
“Gametes are never hybrid”. This is a statement of :

(a) Law of Segregation (b) Law of Dominance

(c) Law of Random Fertilization (d) Law of Independent Assortment

13. öuõhUP SÔ¯ß Gߣx :
(A) UAG (B) UUU (C) AUG (D) UGA
Initiation Codon is :

(a) UAG (b) UUU (c) AUG (d) UGA

14. öuõhº Âή£ØÓ P¸Ås v_ Põn¨£kÁx :
(A) Áõ¼ì÷|›¯õ (B) ÷PõUPì
(C) AµõUQì (D) A›UPõ Pma_
Ruminate endosperm is found in :

(a) Vallisneria (b) Cocos

(c) Arachis (d) Areca catechu

15. ö£÷hõöáÛ]ì Gߣx :
(A) E°›z öuõøP (B) öuõÀ¾°º £iÁ®
(C) }º (D) ©s
Pedogenesis refers to :

(a) Population (b) Fossils

(c) Water (d) Soil

A

7 6632

£Sv & II/PART - II

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS ©mk® Âøh¯ÎUPÄ®. ÂÚõ Gs
24 &US Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x2=12

Note : Answer any six of the following questions. Question number 24 is
compulsory.

16. Põßu÷µõL¤À¼ GßÓõÀ GßÚ ?

What is Cantharophily ?

17. ö©sh¼¯zøu ©Ö B´Ä ö\´x PshÔ¢u AÔ¯À AÔbºPÎß ö£¯ºPøÍ
GÊxP.

Give the names of the scientists who rediscovered Mendelism.

18. ©µ£qUSÒ÷Í {PÊ® Cøhaö\¯À GßÓõÀ GßÚ ? ©µ£q Cøhaö\¯ÀPøÍ
ÁøP¨£kzxP.

What is intragenic gene interaction ? Classify gene interaction.

19. ©µ£q Áøµ£h® GßÓõÀ GßÚ ?

What is gene mapping ?

20. pBR 322 &ß £h® ÁøµP.

Draw the structure of pBR 322.

21. Eh» P»¨¤Ú©õUPÀ GßÓõÀ GßÚ ?

What is Somatic Hybridization ?

A [ v¸¨¦P / Turn over

6632 8

22. Âøu¨£¢x GßÓõÀ GßÚ ?

What is seed ball ?

23. uøÇ EµªhÀ £ØÔ SÔ¨¦ ÁøµP.

Write a note on green manuring.

24. G¢u C¸ Ai¨£øh öPõÒøPPÒ E°¸ÒÍ uõÁµ ö\ÀPÎÀ EÒÍõº¢x
Põn¨£kQÓx ?

Which of the two phenomena are considered as inherent capacities of living plant
cell ?

£Sv & III/PART - III

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS ©mk® Âøh¯ÎUPÄ®. ÂÚõ Gs
6x3=18
33 &US Pmhõ¯©õP Âøh¯ÎUPÄ®.

Note : Answer any six of the following questions. Question number 33 is
compulsory.

25. JmkuÀ ©ØÖ® £v¯ªhÀ – ÷ÁÖ£kzxP.

Differentiate Grafting and Layering.

26. ö©´°À»õ ©i¯zvß ÁøPPøÍ £h® ÁøµP.

Draw diagram of different types of aneuploidy.

27. ~Û‰hÀ ©ØÖ® Áõ»õUP® GßÓõÀ GßÚ ?

What is meant by Capping and Tailing ?

A

9 6632

28. ©µ£q ©õØÓ¨£mh EnÂß |ßø©PÒ ©ØÖ® wø©PøÍ GÊxP.

Write the benefits and risks of Genetically modified food.

29. ¦v¯ Põk Áͺ¨¤ß ÷|õUP[PÒ ¯õøÁ ?

What are the objectives of afforestation ?

30. `Ì{ø»°¯À £i{ø»PÒ GßÓõÀ GßÚ ? £À÷ÁÖ `Ì{ø»°¯À £i{ø»&
PøÍ GÊxP.

What is Ecological Hierarchy ? Name the levels of Ecological hierarchy.

31. ©sÁÍzøu ÷©®£kzxÁvÀ ~sq°› Emö\¾zvPÒ GÆÁõÖ £¯ß£k&
QßÓÚ ?

How are microbial innoculants used to increase the soil fertility ?

32. BØÓÀ ¤µªm G¨÷£õx® ÷|µõÚøÁ. Põµn® TÖP.

Pyramid of energy is always upright. Give reasons.

33. ÷ÁÖ£kzxP & P¸Ä¸UPÒ ©ØÖ® ö\¯ØøP ÂøuPÒ.

Differentiate Embryoids and Artificial Seeds.

A [ v¸¨¦P / Turn over

6632 10

£Sv & IV/PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer all the questions.

34. (A) `¼ß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.

AÀ»x

(B) uõÁµ ÁÈ•øÓ Áͺa]°ß •UQ¯zxÁ[PøÍ GÊxP.
(a) Draw the structure of ovule and label it.

OR

(b) Write the significance of plant succession.

35. (A) £_[PoP ©µ£q \õº¢u £õµ®£›¯zøu GkzxUPõmkhß öÁÎUöPõnºP.

AÀ»x

(B) uõÁµ[PÎÀ RNA v¸zu[PøÍ ÂÁ›UPÄ®.

(a) Bring out the inheritance of chloroplast gene with example.

OR

(b) Describe RNA Editing in plants.

36. (A) E°º öuõÈÀ ~m£Â¯¼ß £¯ß£õkPøÍ GÊxP.

AÀ»x

(B) ¦÷µõm÷hõ¤Íõìm Áͺ¨¤À Ah[Q²ÒÍ £i{ø»PøÍ ÂÁ›UPÄ®.
(a) Mention the applications of Bio-Technology.

OR

(b) Explain the steps involved in Protoplast Culture.

A

11 6632

37. (A) }º £ØÓõUSøÓ wºøÁ B÷»õ]zx Auß |ßø©PøÍ ÂÍUPÄ®.
AÀ»x
(B) }ºÁõÌ uõÁµ[PÎß ÁøPPøÍ Auß GkzxUPõmkPÐhß ÂÁ›UPÄ®.
(a) Suggest a solution to water crisis and explain its advantages.

OR

(b) Explain different types of Hydrophytes with examples.

38. (A) £°ºö£¸UPzvÀ ¦v¯ £s¦UTÖPøÍ E¸ÁõUS® ¦v¯ £°ºö£¸UP
öuõÈÀ~m£ •øÓPøͨ £mi¯¼kP.
AÀ»x
(B) A›] ©ØÖ® ÷uUQß ö£õ¸Íõuõµ •UQ¯zxÁzøu GÊxP.
(a) List out the new breeding techniques involved in developing new traits in
plant breeding.

OR

(b) Write the economic importance of Rice and Teak.

-oOo-

A [ v¸¨¦P / Turn over