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 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 Biology English Medium Free Online Test 1 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.
Precursor mRNA \(\underrightarrow { A } \) mRNA
Capping
Tailing
Splicing
Transcribing
2.
A pleiotropic gene:
Is a gene evolved during Pliocene
Controls a trait only in combination with another gene
Controls multiple traits in an individual
Is expressed only in primitive plants
3.
A few statements describing certain features of reproduction are given below. Select the options that are true for both sexual and asexual reproduction from the options given:
(i) Gametic fusion takes place
(ii) Transfer of genetic material takes place
(iii) Reduction division takes place
(iv) Progeny have some resemblance, with parents
i and ii
ii and iii
ii and iv
i and ii
4.
Oral contraceptive pills contain synthetic ____ and hormones. (or) Contraceptive pills contain:
androgen and testosterone
Androgen and Oxytocin
relaxin and inhibin
Progesterone and estrogen
5.
Presence of tail in human baby is an example for ________________
Vestigial organ
Atavism
Homologous organ
Analogous organ
6.
In the year ______ india is expected to become the largest country in population size ______
2021
2025
2022
2030
7.
The follicular cells of the ovum are held together by a substance called _____
hyaluronidase
progesterone
oestrogen
hyaluronic acid
8.
The ______ is the smallest human cell.
sperm
neuron
nephron
alveoli
9.
The Okazaki segments are joined by _________.
DNA polymerase
RNA polymerase
DNA ligase
Endonuclease
10.
Paedogamy is the sexual union of _____
morphologically different gametes
physiologically different gametes
young individuals immediately after the formation from parents
dissimilar gametes
11.
Transverse Binary fission is seen is ______
Vorticella
Paramecium
Plasmodium
Euglena
12.
__________ is a disease where abnormal haemoglobin is produced in patients.
Phenylketonuria
Huntington's chorea
Thalassemia
Albinism
13.
All populations in a given physical area are defined as
Biome
Ecosystem
Territory
Biotic factors
14.
The first clinical gene therapy was done for the treatment of
AIDS
Cancer
Cystic fibrosis
SCID
15.
16.
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
17.
The first life on earth originated
in air
on land
in water
on mountain
18.
Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?
Gonorrhoea is a STD whereas others are not.
Trichomoniasis is a viral disease whereas others are bacterial.
HIV is a pathogen whereas others are diseases.
Hepatitis B is eradicated completely whereas others are not.
19.
pBR 322, BR stands for ______.
Plasmid Bacterial Recombination
Plasmid Bacterial Replication
Plasmid Bolivar and Rodriguez
Plasmid Baltimore and Rodriguez
20.
Hershey and Chase experiment with bacteriophage showed that ______.
Protein gets into the bacterial cells
DNA is the genetic material
DNA contains radioactive sulphur
Viruses undergo transformation
21.
A 30 year old woman has bloody diarrhea for the past 14 hours, which one of the following organisms is likely to cause this illness?
Streptococcus pyogens
Clostridium difficile
Shigella dysenteriae
Salmonella enteritidis
22.
In which type of parthenogenesis are only males produced?
Arrhenotoky
Thelytoky
Amphitoky
Both a and b
23.
Haemophilia is more common in males because it is a ______.
Recessive character carried by Y-chromosome
Dominant character carried by Y-chromosome
Dominant trait carried by X-chromosome
Recessive trait carried by X-chromosome
24.
Extra nuclear inheritance is a consequence of presence of genes in _____.
Mitrochondria and chloroplasts
Endoplasmic reticulum and mitrochondria
Ribosomes and chloroplast
Lysososmes and ribosomes
25.
Choose the correct statement from the following
Gametes are involved in asexual reproduction
Bacteria reproduce asexually by budding
Conidia formation is a method of sexual reproduction
Yeast reproduce by budding
1.
(c)
Splicing
2.
(c)
Controls multiple traits in an individual
3.
(c)
ii and iv
4.
(d)
Progesterone and estrogen
5.
(b)
Atavism
6.
(c)
2022
7.
(d)
hyaluronic acid
8.
(a)
sperm
9.
(c)
DNA ligase
10.
(c)
young individuals immediately after the formation from parents
11.
(b)
Paramecium
12.
(c)
Thalassemia
13.
(a)
Biome
14.
(c)
Cystic fibrosis
15.
(c)
16.
(b)
15 to 30 minutes and 121° C
17.
(c)
in water
18.
(c)
HIV is a pathogen whereas others are diseases.
19.
(c)
Plasmid Bolivar and Rodriguez
20.
(b)
DNA is the genetic material
21.
(c)
Shigella dysenteriae
22.
(a)
Arrhenotoky
23.
(d)
Recessive trait carried by X-chromosome
24.
(a)
Mitrochondria and chloroplasts
25.
(d)
Yeast reproduce by budding
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Physics
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History
Computer Applications
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Computer Science
Business Maths and Statistics
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Chemistry
Physics
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History
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