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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.
Questions + Answers key
Take MCQ Biology Test
1.
Match the following
| (A) | micropropagation | (1) | DNA bank |
| (B) | Cryopreservation | (2) | Sodium alginate |
| (C) | Germplasm conservation | (3) | Banana |
| (D) | Artificial seeds | (4) | - 196 oC |
1, 3, 4, 2
2, 1, 3, 4
3, 4, 1, 2
4, 3, 2, 1
2.
The bacteria responsible for causing Crown Gall:
Escherichia coli
Bacillus subtilis
Bacillus thuringiensis
Agrobacterium tumefaciens
3.
The time duration for sterilization process by using autoclave is ______ minutes and the temperature is ______.
10 to 30 minutes and 125° C
15 to 30 minutes and 121° C
15 to 20 minutes and 125° C
10 to 20 minutes and 121° C
4.
5.
Plasmids are ______.
circular protein molecules
required by bacteria
tiny bacteria
confer resistance to antibiotics
6.
What is a cybrid?
7.
8.
Explain the basic concepts involved in plant tissue culture
9.
10.
Draw and label Ti plasmid.
11.
1.
(c)
3, 4, 1, 2
2.
(d)
Agrobacterium tumefaciens
3.
(b)
15 to 30 minutes and 121° C
4.
(c)
5.
(d)
confer resistance to antibiotics
6.
Cybrid is a cytoplasmic hybrid obtained by the fusion of cytoplasm of cells of different parental sources; a term applied to the fusion of cytoplasms of two different protoplasts.
7.
8.
Basic concepts of Tissue Culture
Basic concepts of plant tissue culture are totipotency, differentiation, dedifferentiation and redifferentiation.
Totipotency
The property of live plant cells that they have the genetic potential when cultured in nutrient medium to give rise to a complete individual plant.
Differentiation
The process of biochemical and structural changes by which cells become specialized in form and function.
Redifferentiation
The further differentiation of already differentiated cell into another type of cell. For example, when the component cells of callus have the ability to form a whole plant in a nutrient medium, the phenomenon is called redifferentiation.
Dedifferentiation
The phenomenon of the reversion of mature cells to the meristematic state leading to the formation of callus is called dedifferentiation. These two phenomena of redifferentiation and dedifferentiation are the inherent capacities of living plant cells or tissue. This is described as totipotency.
9.
10.
11.
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Tamilnadu Stateboard 12th Standard Subjects
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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
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