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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 22/08/2026
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
Match the following
| (a) Dr. B.P. Pal | (i) Eminent rice breeder |
| (b) Dr. K. Ramiah | (ii) Developed C 591 |
| (c) N.G.P Rao | (iii) Developed superior disease resistant wheat |
| (d) C.T Patel | (iv) Sorghum breeder |
| (e) Choundhary Ram Dhan | (v) Developed first cotton hybrid |
(a)(i), (b)(iv), (c)(v), (d)(ii), (e)(iii)
(a)(iv), (b)(v), (c)(ii), (d)(iii), (e)(i)
(a)(v), (b)(ii), (c)(iii), (d)(i), (e)(iv)
(a)(iii), (b)(i), (c)(iv), (d)(v), (e)(ii)
2.
Mutation theory was proposed by____________
T. H. Morgan
Hugo de Vries
Alfred Sturtevant
Sutton and Boveri
3.
Recombination frequency (RF) is equal to
\(\frac { No.ofoffsprings }{ No.ofrecombinants } \times 100\)
\(\frac { No.of\ recombinants }{ No.ofparentalstrains } \times 100\)
\(\frac { No.ofrecombinants }{ No.ofoffsprings } \times 100\)
\(\frac { No.ofoffsprings }{ No.ofparentalstrains } \times 100\)
4.
Incomplete linkage was reported by Hutchinson in ___________
Drosophila
Maize
Neurospora
Lathyrus odoratus
5.
____________ is the 100th Satellite launched to watch border surveillance.
GSAT-6A
SCAT SAT-I
INSAT 3DR
CARTOSAT-2
6.
Total number of forestry extension centres in Tamil Nadu is ______________
16
32
18
51
7.
Match list I with list II
| List I | List II |
| Biofertilizer | Organisms |
| i) Free living N2 | a) Aspergillus |
| ii) Symbiotic N2 | b) Amanita |
| iii) P Solubilizing | c) Anabaena azollae |
| iv) P Mobilizing | d) Azotobacter |
| i | ii | iii | iv |
| c | a | b | d |
| i | ii | iii | iv |
| d | c | a | b |
| i | ii | iii | iv |
| a | c | b | d |
| i | ii | iii | iv |
| b | a | d | c |
8.
Which one of the following crop varieties correct matches with its resistance to a disease?
| Variety | Resistance to disease |
| Pusa Komal | Bacterial blight |
| Variety | Resistance to disease |
| Pusa Sadabahar | White rust |
| Variety | Resistance to disease |
| Pusa Shubhra | Chilli mosaic virus |
| Variety | Resistance to disease |
| Brassica | Pusa swarnim |
9.
Match column I (crop) with column II (Corresponding disease resistant variety) and select the correct option from the given codes.
| Column I | Column II |
| I) Cowpea | i) Himgiri |
| II) Wheat | ii) Pusa komal |
| III) Chilli | iii) Pusa Sadabahar |
| IV) Brassica | iv) Pusa Swarnim |
| I | II | III | IV |
| iv | iii | ii | i |
| I | II | III | IV |
| ii | i | iii | iv |
| I | II | III | IV |
| ii | iv | i | iii |
| I | II | III | IV |
| i | iii | iv | ii |
10.
Crosses between the plants of the same variety are called ____.
interspecific
inter varietal
intra varietal
inter generic
11.
Desired improved variety of economically useful crops are raised by _______.
Natural Selection
hybridization
mutation
biofertilisers
12.
The plants which are grown in silvopasture system are ______.
Sesbania and Acacia
Solenum and Crotalaria
Clitoria and Begonia
Teak and sandal
13.
14.
Due to incomplete linkage in maize, the ratio of parental and recombinants are ______.
50:50
7:1:1:7
96.4: 3.6
1:7:7:1
15.
An allohexaploidy contains ______.
Six different genomes
Six copies of three different genomes
Two copies of three different genomes
Six copies of one genome
1.
(d)
(a)(iii), (b)(i), (c)(iv), (d)(v), (e)(ii)
2.
(b)
Hugo de Vries
3.
(c)
\(\frac { No.ofrecombinants }{ No.ofoffsprings } \times 100\)
4.
(b)
Maize
5.
(d)
CARTOSAT-2
6.
(b)
32
7.
(b)
| i | ii | iii | iv |
| d | c | a | b |
8.
(a)
| Variety | Resistance to disease |
| Pusa Komal | Bacterial blight |
9.
(b)
| I | II | III | IV |
| ii | i | iii | iv |
10.
(c)
intra varietal
11.
(b)
hybridization
12.
(a)
Sesbania and Acacia
13.
(c)
14.
(b)
7:1:1:7
15.
(c)
Two copies of three different genomes
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Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
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