12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 05/11/2020
12th Standard Botany English Medium Free Online Test One Mark Questions 2020
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 Test1.
Tetracycline is obtained from_________
S.nodosus
S.aureofacins
S.grises
P. chryosogenum
2.
Statement 1: Liposomes are the artificial lipoprotein vesicles.
Statement 2: Liposomes are highly used in gene transfer.
Statement 1 is correct and Statement 2 is also correct.
Statement 1 is correct and Statement 2 is incorrect.
Both the statements are incorrect.
Statement 1 is incorrect and Statement 2 is correct
3.
The bacteria responsible for causing Crown Gall:
Escherichia coli
Bacillus subtilis
Bacillus thuringiensis
Agrobacterium tumefaciens
4.
Statement 1: Pairing of homologous chromosome is called as syndesis.
Statement 2: Proterminal synapsis occurs from telomeres.
Statement 1 is correct and Statement 2 is incorrect
Statement 1 is incorrect and Statement 2 is correct
Both the statements are correct
Both the statements are incorrect
5.
Transition type of gene mutation is caused when__________
AC is replaced by GT
AG is replaced by TC
AC is replaced by TG
TC is replaced by AG
6.
Which is not a feature of the chromosomal theory of inheritance?
Somatic cells of organisms are derived from zygote by repeated meiosis.
Chromosomes retain their structural uniqueness throughout the life of an organism.
Mendelian factors are located in chromosomes
Sutton and Boveri independently proposed the theory.
7.
Assertion (A): Test cross is done between F2 hybrid with F1 recessive
Reason (R): It helps to identify the homozygosity of hybrids
A and R are correct R explains A
A and R are incorrect
A is correct R is incorrect
A is incorrect R is correct
8.
Identify the correct statement.
Grafting is a modem method of artificial propagation.
The plant which is used for graft is Scion.
In tongue grafting, the scion bud is placed inside the incision beneath bark.
Grafting is usually carried out in monocot plants.
9.
Assertion (A) : Plains and valleys are rich in vegetation
Reason (R): Slow drain of surface water and better water retention is noticed.
A is true R is false
R explains A
A and R are false
A and R are true. But R does not explains A
10.
Which of the following plant was introduced as a contaminant into India along with wheat?
Parthenium hysterophorus
Zea mays
Rosa indica
Mangifera indica
11.
The bottom most zone of a pond is termed as .
Limnetic zone
Littoral zone
Benthic zone
Profundal zone
12.
Identify the cryoprotectant
Dimethyl formamide
Fructose
Glycerol
Sodium alginate
13.
Assertion (A) : Protoplasts are cells devoid of cell wall.
Reason (R) : Secondary metabolites are synthesized by protoplasmic fusion.
Both A and R are correct but R is not a correct explanation to A
R explains A
A is correct R is incorrect
Both A and R are incorrect
14.
Who is popularly called as the "father of green revolution in India"?
Nel Jeyaraman
Dr. M.S. Swaminathan
Dr. Nammalvar
N.G.P. Rao
15.
Clean Development Mechanism (CDM) is defined in ________________
Copenhagen Acord
Montreal Protocol
Paris Agreement
Kyoto Protocol
16.
The plant source of Marijuana is ________
Andrograph is paniculata
Phyllanthus maderspatensis
Cannabis sativa
Papaver somniferum
17.
Select the incorrect statement from given statement.
A tonic used for cardiac arrest is obtained from Digitalis purpurea
Medicine used to treat Rheumatic pain is extracted from Capsicum annum
An anti malarial drug is isolated from Cinchona officinalis.
Anti-cancinogenic property is not seen in Catharanthus roseus.
18.
The process of recombinant DNA technology has the following steps
I. amplication of the gene
II. Insertion of recombinant DNA into the host cells
III. Cutting of DNA at specific location using restriction enzyme .
IV. Isolation of genetic material (DNA) Pick out the correct sequence of step for recombinant DNA technology.
II, III, IV, I
IV, II, III, I
I, II, III, IV
IV, III, I, II
19.
The genotype of a plant showing the dominant phenotype can be determined by _____.
Back cross
Test cross
Dihybrid cross
Pedigree analysis
20.
First cell of male gametophyte in angiosperm is ______.
Microspore
megaspore
Nucleus
Primary Endosperm Nucleus
1.
(b)
S.aureofacins
2.
(d)
Statement 1 is incorrect and Statement 2 is correct
3.
(d)
Agrobacterium tumefaciens
4.
(a)
Statement 1 is correct and Statement 2 is incorrect
5.
(a)
AC is replaced by GT
6.
(a)
Somatic cells of organisms are derived from zygote by repeated meiosis.
7.
(b)
A and R are incorrect
8.
(b)
The plant which is used for graft is Scion.
9.
(b)
R explains A
10.
(a)
Parthenium hysterophorus
11.
(c)
Benthic zone
12.
(c)
Glycerol
13.
(c)
A is correct R is incorrect
14.
(b)
Dr. M.S. Swaminathan
15.
(d)
Kyoto Protocol
16.
(c)
Cannabis sativa
17.
(d)
Anti-cancinogenic property is not seen in Catharanthus roseus.
18.
(b)
IV, II, III, I
19.
(b)
Test cross
20.
(a)
Microspore
12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications களப்பெயர் முறைமை (DNS) Sample Question Papers Study Material - QB365 Set A
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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
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