Tamil Nadu 12th Std Model Question Paper Biology

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No. of Printed Pages : 12
3277 (NS)
!3277NSBiology! £vÄ Gs
Register Number

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¨ £¯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.

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

3277 (NS) 2

1. Bg-]-÷¯õì-ö£º®-P-Îß Bs- ÷P-ªm-÷hõ-ø£m-iß •uÀ ö\À :
(A) P¸ Fs v_ (B) ~s Âz-x
(C) -ö£¸ Âz-x (D) Em-P-¸
First cell of Male gametophyte in angiosperms is :
(a) Primary endosperm (b) Microspore
(c) Megaspore (d) Nucleus

2. Jzu £s- ¤ - ø n ö£ØÓ y¯ ]Á¨¦ ©»º- P øÍ Eøh¯ uõ- Á - µ ® Jzu
£s-¤øÚ Eøh¯ öÁÒøÍ ©»º öPõsh y¯ uõ-Á-µz-x-hß P»¨¦ ö\´-²®
÷£õx QøhUS® ©PÄa\¢uv :
(A) AøÚz-x® ]Á¨¦ ©»º-PÒ (B) CÍ® öÁÒøÍ ©»º-PÒ
(C) -CÍ® ]Á¨¦ ©»º-PÒ (D) AøÚz-x® öÁÒøÍ ©»º-PÒ
If a homozygous red flowered plant is crossed with a homozygous white flowered
plant then the off-spring will be :
(a) All red flowered (b) Half white flowered
(c) Half red flowered (d) All white flowered

3. Gx AiU- P i J¸ "©µ- £ q öÁΨ- £ õk AÔ-  ¨- £ õͺ' P¸-  - ¯ õP
£¯ß-£-kz-u¨-£-k-Q-Óx ?
(A) GMF (B) Ám-h-Á-iÁ ¦µ-u®
(C) GFP (D) PLA
Which is frequently used as reporter of expression ?
(a) GMF (b) Circular protein
(c) GFP (d) PLA

4. øÁµì AØÓ uõ-Á-µ[-PÒ Cv-¼-¸¢x E¸-ÁõU-P¨-£-k-Q-ßÓÚ :
(A) ö\À ªuøÁ Áͺ¨-¦ (B) EÖ¨¦ Áͺ¨-¦
(C) BU-Pz-v_ Áͺ¨-¦ (D) ¦÷µõm-÷hõ-¤Íõ\ Áͺ¨-¦
Virus free plants are developed from :
(a) Cell suspension culture (b) Organ culture
(c) Meristem culture (d) Protoplast culture

3 3277 (NS)

5. ö£õ-¸z-x-P :
(1) ìøh-÷Úõ-÷£-vU (i) E¨-¦z-uß-ø©
(2) ìöh-÷Úõ-]-¯ì (ii) }º-ÁõÌ Chz-vß BÇ®
(3) ìöh-÷Úõ-íõ-ø»ß (iii) En-Ä
(4) ìöh-÷Úõ-L-£õ-âU (iv) Áõ-È-hz ÷uº-Ä
(A) (1) - (iv), (2) - (i), (3) - (iii), (4) - (ii)
(B) (1) - (iii), (2) - (i), (3) - (ii), (4) - (iv)
(C) (1) - (ii), (2) - (i), (3) - (iv), (4) - (iii)
(D) (1) - (ii), (2) - (iv), (3) - (i), (4) - (iii)
Match the following :
(1) Stenobathic (i) Salinity
(2) Stenoecious (ii) Depth of water/habitat
(3) Stenohaline (iii) Food
(4) Stenophagic (iv) Habitat selection
(a) (1) - (iv), (2) - (i), (3) - (iii), (4) - (ii)
(b) (1) - (iii), (2) - (i), (3) - (ii), (4) - (iv)
(c) (1) - (ii), (2) - (i), (3) - (iv), (4) - (iii)
(d) (1) - (ii), (2) - (iv), (3) - (i), (4) - (iii)

6. K÷\õ-Ûß Ai-Á-Î ©s-h-»® GÚ¨-£-k-Áx :
(A) ©z-v¯ K÷\õß (B) K÷\õß PÁ\®
(C) £¯-ÚØÓ K÷\õß (D) |ßø© u¸® K÷\õß
The Ozone layer of troposphere is called :
(a) Middle Ozone (b) Ozone Shield
(c) Bad Ozone (d) Good Ozone

7. §a] ©Ø-Ö® EÁº uß-ø©ø¯ uõ[-S® uõ-Á-µz-vß ö£¯º :
(A) ö\õ-Úõ-¼-Põ (B) m›m-i-÷PÀ
(C) µ£õ-÷Úõ ¤µõ-]U-Põ (D) Am-hõ-ª-hõ&2
Name the plant which is pest resistant and saline tolerant :
(a) Sonalika (b) Triticale
(c) Rhaphanobrassica (d) Atomita-2

[ v¸¨¦P / Turn over

3277 (NS) 4

8. Áo-P Ÿv-¯õP •U-Q-¯-zx-Á® Áõ´¢u, ÷ÁÍõs Põ-k-P-ÎÀ ÁͺU-P¨-£-k®
©µ[-PøÍU SÔ-¨¤-k-P.
(A) G›z-øµÚõ, AÀ-¥-ê-¯õ
(B) ©ø»-÷Á®¦, Ph®-¦
(C) AU-÷P-æ-¯õ, Aéõ-i-µõU-hõ Cs-i-Põ
(D) ö\ì-£õ-Û-¯õ, AU-÷P-æ-¯õ
Some of the major species cultivated in Agroforestry for commercial use :
(a) Erythrina, Albizzia
(b) Malaivembu, Kadambu
(c) Acacia, Azadirachta Indica
(d) Sesbania, Acacia

¤›Ä - 2 / SECTION - 2
SÔ¨¦ : RÌU- P õ- q ® ÂÚõU- P - Î À H÷u- Ý ® |õß- S ÂÚõUPÐUS
Âøh¯ÎUPÄ®. 4x2=8
Note : Answer any four of the following questions.
9. ø\¤-›m & Áøµ-¯-ÖU-P-Ä®.
Define Cybrid.

10. Âøu¨-£¢-vß £¯ß-PÒ |õß-QøÚ GÊ-xP.
Write any four uses of Seedball.

11. y´ø© ÷©®-£õk ö\¯À vm-hz-vß SÔU-÷PõÒ ¯õx ?
What are the objectives of clean development mechanism ?

12. C¯ØøP ÷ÁÍõsø© & Áøµ-¯-ÖU-P-Ä®.
Define - Organic farming.

13. {»-÷Á®-¤ß uõ-Á-µ-¯À ö£¯º ©Ø-Ö® Sk®-£z-v-øÚU SÔ¨-¤mk, H÷u-Ý®
J¸ £¯ß GÊ-x-P.
Write the Botanical name and family of Nilavembu. Write any one of its uses.

14. E°º-öuõ-ÈÀ ~m-£-Â-¯-¼À £¯ß-£-k® ö|õ-v-PÒ ¯õøÁ ?
Name the enzymes involved in genetic engineering.

5 3277 (NS)

¤›Ä - 3 / SECTION - 3
SÔ¨¦ : RÌU- P õ- q ® ÂÚõU- P - Î À H÷u- Ý ® ‰ßÖ ÂÚõUPÐUS
Âøh¯ÎUPÄ®. ÂÚõ Gs 19 &US Pmhõ¯©õP Âøh¯ÎUPÄ®. 3x3=9
Note : Answer any three of the following questions. Question No. 19 is compulsory.
15. |õßS ©o uõÁµzvÀ

£õµ®£›¯zvß ÁøPø¯ ÂÁ›UPÄ®.
In 4 o'clock plant

Explain the type of inheritance.

16. pBR 322 ¤Íõì-ªm Gß-ÓõÀ GßÚ ?
What is pBR 322 plasmid ?

17. £-_ø© CÀ» ÂøÍÄ Gß-ÓõÀ GßÚ ? £_ø© CÀ» Áõ-²U-P-Îß \õº¦
£[-P-Ψ-¤øÚ £h® Áøµ-P.
What is Green House Effect ? Draw the relative contributions of green house gases.

18. EøÓ Sκ £õ-x-Põ¨¦ £ØÔ GÊ-x-P.
Give an account on cryo preservation.

19. ¦Â Áõ- È - h ® ©Ø- Ö ® ö\¯À Áõ- È - h ® BQ- ¯ - Á Ø- Ô ØS Cøh- ÷ ¯ EÒÍ
÷ÁÖ-£õ-k-PÒ ‰ß-Ô-øÚU TÖP.
Write the three differences between Habitat and Niche.

[ v¸¨¦P / Turn over

3277 (NS) 6

¤›Ä - 4 / SECTION - 4

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

Note : Answer all the questions.

20. (A) ©P-µ¢-u- S-Çõ´ `¼-ÝÒ ~øÇ-u-¼ß ÁøP-P-øÍ ÂÍU-S-P.

AÀ»x

(B) ©µ-£q Áøµ-£-h® Gß-ÓõÀ GßÚ ? Auß £¯ß-PøÍ GÊ-x-P.
(a) Explain the different mode of entry of pollen tube into the ovule.

OR

(b) What is gene mapping and write its uses.

21. (A) `Ì-{ø» ©s-h-»zøu £õ-x-Põ¨-£x GÆ-ÁõÖ ?

AÀ»x

(B) µõ-•-Ä®, ÷\õ-•-Ä® ÂÁ-\õ-°-PÒ. µõ• uØ-P-»¨-¤ß ‰»® £°º ö\´-uõº.
÷\õ• P»¨¦ uõ-Á-µ[-PÒ ‰»® £°º ö\´-uõº.

(i) CvÀ ¯õ-¸US ¦v-¯ uõ-Áµ ÁøP-PÒ QøhU-S® ?

(ii) A¢u ÷uºÄ •øÓ°ß |ß-ø©-PÒ ©Ø-Ö® wø©-PøÍ GÊ-x-P.
(a) How to protect the ecosystem ?

OR

(b) Ramu and Somu are farmers. Ramu cultivated the crops by self fertilization
method. Somu cultivated the crops from mixed population.

(i) Who will get new variety ?

(ii) Write the advantages and disadvantages of their selection.

7 3277 (NS)

£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. RÌ-Á-¸-Á-Ú-ÁØ-ÖÒ, P¸U-÷PõÍ-©õU-Pz-øu¨ £Ø--Ô¯ Es-ø©-¯õÚ TØÖ Gx ?
(A) P¸ÄØÓ •m-øh-°-¼-¸¢x £» ö\À {ø» E¸-Áõ-uÀ
(B) ‰» CÚa-ö\À AkU-S-P-Î-¼-¸¢x SÔ¨-¤mh EÖ¨-¦-PÒ ÷uõß-Ö-uÀ
(C) -Kµ-kUS P¸U-÷PõÍ®, ‰Á-kUS P¸U-÷PõÍ-©õP ©õ-Ö® {PÌa-]
(D) P¸U-÷PõÍ® P¸¨-ø£-°ß _Á-¸-hß Jm-iU öPõÒ-Ð-uÀ
Which one of the following is true to gastrulation ?
(a) Formation of multicellular structure from Zygote
(b) Formation of specific organs from germ layers
(c) Formation of three germ layer embryo from single layer embryo
(d) Attachment of blastocyst to the uterine wall

2. RÌ-Á-¸® {ø» {øÓ-ÄØ-ÓõÀ, E¸-Á-ö©õzu Cµm-øh-¯º-PÒ E¸-ÁõUP¨£k&
Q-Óõº-PÒ :
(A) Cµsk ¢x ö\À-PÒ, J¸ Ash ö\Àø» P¸-Ä-Óa ö\´-Qß-Ó-Ú
(B) Cµsk ¢x ö\À-PÒ, Cµsk As-h[-PøÍU P¸-Ä-Óa ö\´-Qß-ÓÚ
(C) J¸ ¢x ö\À, Cµsk As-h[-PøÍU P¸-Ä-Óa ö\´-Qß-ÓÚ
(D) J¸ ¢x ö\À, J¸ Ash ö\Àø» P¸-Ä-Óa ö\´-Q-Ó-x
Identical twins are produced when the following condition is satisfied :
(a) Two sperms are fertilizing one egg
(b) Two sperms are fertilizing two eggs
(c) One sperm is fertilizing two eggs
(d) One sperm is fertilizing one egg

[ v¸¨¦P / Turn over

3277 (NS) 8

3. ö£õ-¸z-x-P.
(1) uõ-ª-µ® öÁÎ-Â-k IUD (i) LNG-20
(2) íõº-÷©õß öÁÎ-Â-k IUD (ii) ¼¨-£ì ÁøÍ-¯ IUD
(3) ©¸¢-vÀ-»õ IUD (iii) \õ-öí-¼
(4) ©õz-v-øµ-PÒ (iv) Multiload-375
(A) (1) - (iv), (2) - (i), (3) - (ii), (4) - (iii)
(B) (1) - (iv), (2) - (ii), (3) - (i), (4) - (iii)
(C) (1) - (iv), (2) - (i), (3) - (iii), (4) - (ii)
(D) (1) - (i), (2) - (iv), (3) - (ii), (4) - (iii)
Match the following :
(1) Copper releasing IUD (i) LNG-20
(2) Hormone releasing IUD (ii) Lippes loop IUD
(3) Non-medicated IUD (iii) Saheli
(4) Mini pills (iv) Multiload-375
(a) (1) - (iv), (2) - (i), (3) - (ii), (4) - (iii)
(b) (1) - (iv), (2) - (ii), (3) - (i), (4) - (iii)
(c) (1) - (iv), (2) - (i), (3) - (iii), (4) - (ii)
(d) (1) - (i), (2) - (iv), (3) - (ii), (4) - (iii)

4. i.Gß.H. \ºU-P-øµ-P-ÐU-S®, Bº.-Gß.H. \ºU-P-øµ-P-ÐU-S® Cøh-÷¯ EÒÍ
÷ÁÖ-£õk :
(A) i&BUê-›-÷£õì \ºU-P-øµ-°À J¸ BU-ê-áß Aq Av-P-©õP C¸¨-£-x
(B) ›÷£õì \ºU-P-øµ-°À J¸ BU-ê-áß Aq SøÓ-ÁõP C¸¨-£-x
(C) ›÷£õì \ºU-P-øµ-°À C¸ BU-ê-áß AqU-PÒ SøÓ-ÁõP C¸¨-£-x
(D) i&BU- ê - › - ÷ £õì \ºU- P - ø µ- ° À J¸ BU- ê - á ß Aq SøÓÁõP
C¸¨-£-x
The difference between DNA sugars and RNA sugars is :
(a) One oxygen atom excess in deoxyribose sugars
(b) One oxygen atom less in ribose sugars
(c) Two oxygen atoms less in ribose sugars
(d) One oxygen atom less in deoxyribose sugars

9 3277 (NS)

5. TØÖ (T) : ©µ-£q ©õØ-Ó¨-£mh Bt & £¸zv, ÷|õ´ Gvº¨-¦z ußø©
öPõsh ÁøP.
Põ-µ-n® (Põ) : cry & |a_, Cz- u õ- Á - µ z- v À EØ- £ zv ö\´- ¯ ¨- £ - k - Á - u õÀ,
uÛzx Áõ-Ê® §g-ø\-P-ÐUS Gv-µõÚ |h-Á-iU-øP-P-ÎÀ
Dk-£-k-Q-Ó-x.
(A) (T) ©Ø-Ö® (Põ) BQ-¯øÁ Es-ø©-¯õ-Ú-øÁ; BÚõÀ (Põ), (T) &ø¯
ÂÍU-P-ÂÀø»
(B) (T) uÁ-Ö; (Põ) \›
(C) (T) ©Ø-Ö® (Põ) BQ-¯øÁ uÁ-Óõ-Ú-øÁ
(D) (T) Esø© BÚõÀ (Põ) uÁ-Ö
Assertion (A) : Genetically engineered Bt-cotton is disease resistant type.
Reason (R) : Cry-toxin produced in the plant has specific activities against
free living fungi.
(a) Both (A) and (R) are true, but (R) does not explain (A)
(b) (A) is wrong ; (R) is correct
(c) Both (A) and (R) are wrong
(d) (A) is true but (R) is wrong

6. ELISA •uß-ø©-¯õP CuØ-S¨ £¯ß-£-k-Q-Ó-x.

(A) ¸®-£z-uUP £s-¦-P-øÍ-²-øh¯ uõ-Á-µ[-PøÍz ÷uºÄ ö\´-¯
(B) vjº ©õØ-Ó[-PøÍU Ps-h-Ô-¯
(C) ÷|õ´U Q¸-ª-PøÍU Ps-h-Ô-¯
(D) ¸®-£z-uUP £s-¦-P-øÍ-²-øh¯ »[-S-PøÍz ÷uºÄ ö\´-¯
ELISA is mainly used for :
(a) Selecting plants having desired traits
(b) Detection of mutations
(c) Detection of pathogens
(d) Selecting animals having desired traits

[ v¸¨¦P / Turn over

3277 (NS) 10

7. G.÷Põ- ø » &ø¯ Âh \õU- P - ÷ µõ- ø ©- é ì \º-  - ê ÷¯ ©Ö- ÷ \ºUøP
Cß-hº Lö£-µõß-PøÍ EØ-£zv ö\´-Á-vÀ ]Ó¢-ux. Hß ?
(A) E°-›-¯ ö|õ-v-P-»-ÛÀ G.÷Põ-ø»ø¯ £¯ß-£-kzu •i-¯õ-x
(B) ¦µ-u[-PÒ EØ-£z-vUS ¤Íõì-ªm-k-PÒ G.÷Põ-ø»- &°À CÀ-ø»
(C) ¦µ-u[-PøÍ \ºU-P-øµ-÷¯Ø-Ó® Aøh-¯ øÁU-Pz ÷uøÁ-¯õÚ C¯[S uÍ®
G.÷Põø» &°À CÀ-ø»
(D) ¦µ- u [- P øÍ EØ- £ zv ö\´- Á - u Ø- S z ÷uøÁ- ¯ õÚ G.÷Põø» GÎ- v À
Qøh¨-£-vÀø»
Why Saccharomyces Cerevisiae is more suitable for production of recombinant
interferons than E.coli ?
(a) E.coli cannot be used in biofermentor.
(b) E.coli does not have suitable plasmid for the production of proteins.
(c) E.coli does not have the machinery for glycosylation of proteins.
(d) E.coli is not easily available for the production of proteins.

8. ÁõÈ- h ^µ- È - Â - Ú õÀ ªP Pkø©- ¯ õÚ £õ- v ¨- ¦ - P - Ð US EÒÍõQ, AÈ- ² ®
{ø»-°À EÒÍ Â»[-Q-Ú® Gx ?
(A) •m-÷uõ-¼-PÒ (B) £õ-¿m-i-PÒ
(C) £Óø-Á-PÒ (D) C¸ ÁõÌ-Â-PÒ
Which one of the following are at high risk of extinction due to habitat destruction ?
(a) Echinoderms (b) Mammals
(c) Birds (d) Amphibians

¤›Ä - 2 / SECTION - 2
SÔ¨¦ : H÷u-Ý® |õß-S ÂÚõUPÐUS ©m-k® Âøh¯ÎUPÄ®. 4x2=8
Note : Answer any four of the following questions.

9. As- h ® Âk- £ - k - u À Gß- Ó õÀ GßÚ ? Cx ©õ- u - Â - h õ´ _ÇØ- ] - ° ß
Gz-u-øÚ-¯õ-Áx |õ-ÎÀ |øh-ö£-Ö® ?
What is Ovulation ? In which day of menstrual cycle it takes place ?

10. hÄs ]ßm-÷µõ® ÷|õ´ Es-hõ-Á-uØ-PõÚ Põ-µ-n® ¯õx ?
Write the cause of Down's Syndrome.

11. K£- µ õß- P Ò Gß- £ x GßÚ ? G.÷Põ- ø »- ° À Gz- u øÚ K£- µ õß SÊU- P Ò
EÒÍÚ ?
What are Operons ? How many operon groups are present in E.coli ?

11 3277 (NS)

12. ö\¯- » õUP ÷|õ´z- u - ø hU- P õ¨¦ ©Ø- Ö ® ©¢- u - © õÚ ÷|õ´zuøhU- P õ¨¦
BQ-¯-ÁØ-ÔØ-Q-øh-÷¯-²ÒÍ ÷ÁÖ-£õ-k-PÒ Cµs-iøÚ GÊ-x-P.
Write any two differences between active and passive Immunity.

13. ""öuõ-ÈÀ-xøÓ BÀ-P-íõÀ'' GßÖ SÔ¨-¤-h¨-£-k-Áx Gx ? Hß ?
Which is referred to as Industrial alcohol ? Why ?

14. ©Ûu usk ö\À-P-Îß •U-Q-¯-©õÚ £¯ß-£õk GßÚ ?
What is the most important application of human stem cells ?

¤›Ä - 3 / SECTION - 3
SÔ¨¦ : RÌUPõq® ÂÚõUPÎÀ H÷uÝ® ‰ßÖ ÂÚõUPÐUS
Âøh¯ÎUPÄ®. AvÀ ÂÚõ Gs 19 &US Pmhõ¯©õP Âøh¯ÎUPÄ®.
3x3=9
Note : Answer any three of the following questions. Question number 19 is compulsory.

15. {º-£¢u AÛaø\ ö\¯À Gß-ÓõÀ GßÚ ?
What is known as "Let-Down" reflex ?

16. £ÛU-S-h¢-x-øͨ¦ £ØÔ SÔ¨¦ Áøµ-P.
Write a note on "Amniocentesis".

17. øu©ì _µ¨¤ _µU-S® íõº-÷©õ-Ûß ö£¯º GßÚ ? A¢u íõº-÷©õ-Ûß
£o-PÒ Cµs-iøÚ GÊ-x-P.
Name the hormone secreted by Thymus gland and mention two functions of that
hormone.

18. ©µ-£q Á[-Q-PÒ £Ø-ÔU SÔ¨¦ Áøµ-P.
Write about gene banks.

19. uõz-uõ-Âß Eh-¼À EÒÍ J¸ £s¦ ©PÒ ÁÈ-¯õP ÷£µ-ÝU-Sa ö\À-Q-Óx.
C¢u ÁøP ©µ-¦UPhz-u-¾US Áøµ-£-h® (flowchart) u¸P.
A character present in grandfather goes to grandson through daughter. Draw flowchart
for this pattern of Inheritance.

[ v¸¨¦P / Turn over

3277 (NS) 12

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

Note : Answer the following questions :

20. (A) ©Û-u ©µ-£-q vm-hz-vß (HGP) ÁÈ•øÓ-P-øÍ £ØÔ GÊ-x-P.
AÀ»x
(B) ©Ûu-Ûß £›-nõ© Áͺa-]¨-£õ-øuø¯ ÂÍU-S-P.

(a) Write about the methodologies of HGP.
OR
(b) Explain the evolutionary path of Man.

21. (A) ]Ö SÔ¨¦ ÁøµP :
(i) CÚU-Tm-hz-vß Ahºzv
(ii) ¤Ó¨¦ Ãu® ©Ø-Ö® CÓ¨¦ Ãu®
AÀ»x
(B) ÂÁ-\õ-¯zxøÓ-°À ÷Áv¨-ö£õ-¸m-PøÍ £¯ß-£-kz-x-Á-uõÀ HØ-£-k®
ÂøÍ-Ä-PøÍ GÊ-x-P.
(a) Write short notes on :
(i) Population Density
(ii) Natality and Mortality
OR
(b) Write about the effects of chemicals used in the field of Agriculture.

-oOo-