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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 - Part Five
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.
Genetic drift leads to
Mutation
Bottle neck effect
Immigration
Isolation
2.
Which of the following mRNA yields 6 amino acids after translation?
UCU UAU AGU CGA UGC AGU UGA AAA UUU
UGA AGA UAG GAG CAU CCC UAC UAU GAU
GUC UGC UGG GCU GAU UAA AGG AGC AUU
AUG UAC CAU UGC UGA UGC AGG AGC CCG
3.
Name the scientists who discovered Interferons?
Alick Issac and Jean Lindemann
Thalassemia
Haemophilia
Anaemia
4.
Bacillary dysentery is caused due to __________________
Salmonella
Shigella
Clostridium
Yersinia
5.
Which of the following are likely to be present in deep-sea water?
Archaebacteria
Eubacteria
Blue-green algae
Saprophytic fungi
6.
Which of the following is not required for any of the techniques of DNA finger printing available at present?
Zinc finger analysis
Restriction enzymes
DNA-DNA hybridization
polymerase chain reaction
7.
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
8.
According to Neo Darwinism change in the frequency of genes in population arise due to all Except.
Natural selection
Mutation
Struggle for existence
Variation
9.
Oral contraceptive pills contain synthetic ____ and hormones. (or) Contraceptive pills contain:
androgen and testosterone
Androgen and Oxytocin
relaxin and inhibin
Progesterone and estrogen
10.
The substance not present in tobacco is
nicotine
tar
Morphine
carbon monoxide
11.
The term nucleic acid was coined by ________.
Miescher
Hofmeister
Altman
Mcleod
12.
__________ is a disease where abnormal haemoglobin is produced in patients.
Phenylketonuria
Huntington's chorea
Thalassemia
Albinism
13.
Which of the following is not a sedimentary cycle
Nitrogen cycle
Phosphorous cycle
Sulphur cycle
Calcium cycle
14.
15.
Identify the A, B, C and D in the given table
| Interaction | Effects on species X | Effects on species Y |
| Mutualism | A | (+) |
| B | (+) | (-) |
| Competition | (-) | C |
| D | (-) | o |
| A | B | C | D |
| (+) | Parasitism | (-) | Amensalism |
| A | B | C | D |
| (-) | Mutualism | (+) | Competition |
| A | B | C | D |
| (+) | Competition | (0) | Mutualism |
| A | B | C | D |
| (O) | Amensalism | (+) | Parasitism |
16.
Which among the following awards instituted by the Government of India for individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting Wildlife?
Indira Gandhi Paryavaran Puraskar
Medini Puruskar Yojana
Amrita Devi Bishnoi Award
Pitambar Pant National Award
17.
Identify the correct statements from the following.
Chlamydiasis is a viral disease
Gonorrhoea is caused by a spirochaete bacterium, Treponema palladium
The incubation period for syphilis is 2 to 14 days in males and 7 to 21 days in females
Both syphilis and gonorrhoea are easily cured with antibiotics
18.
pBR 322, BR stands for ______.
Plasmid Bacterial Recombination
Plasmid Bacterial Replication
Plasmid Bolivar and Rodriguez
Plasmid Baltimore and Rodriguez
19.
An operon is a: ______.
Protein that suppresses gene expression
Protein that accelerates gene expression
Cluster of structural genes with related function
Gene that switched other genes on or off
20.
The male homologue of the female clitoris is ______.
Scrotum
Penis
Urethra
Testis
21.
22.
Cirrhosis of liver is caused by chronic intake of ______
Opium
Alcohol
Tobacco
Cocaine
23.
Which of the following explains how progeny can posses the combinations of traits that none of the parent possessed?
Law of segregation
Chromosome theory
Law of independent assortment
Polygenic inheritance
24.
Identify the incorrect pair
sporopollenin - exine of pollen grain
tapetum – nutritive tissue for developing microspores
Nucellus – nutritive tissue for developing embryo
obturator – directs the pollen tube into micropyle
25.
Assertion (A): IUD's are inserted in the ovary.
Reason (R): IUD's Increases phagocytosis of the sperm.
Codes:
(a) Both A and R are correct
(b) Both A and R are incorrect
(c) A is correct R is incorrect
(d) A is incorrect R is correct
Both A and R are correct
Both A and R are incorrect
A is correct R is incorrect
A is incorrect R is correct
1.
(b)
Bottle neck effect
2.
(a)
UCU UAU AGU CGA UGC AGU UGA AAA UUU
3.
(a)
Alick Issac and Jean Lindemann
4.
(b)
Shigella
5.
(a)
Archaebacteria
6.
(a)
Zinc finger analysis
7.
(c)
Controls multiple traits in an individual
8.
(c)
Struggle for existence
9.
(d)
Progesterone and estrogen
10.
(c)
Morphine
11.
(c)
Altman
12.
(c)
Thalassemia
13.
(a)
Nitrogen cycle
14.
(a)
15.
(a)
| A | B | C | D |
| (+) | Parasitism | (-) | Amensalism |
16.
(c)
Amrita Devi Bishnoi Award
17.
(d)
Both syphilis and gonorrhoea are easily cured with antibiotics
18.
(c)
Plasmid Bolivar and Rodriguez
19.
(c)
Cluster of structural genes with related function
20.
(b)
Penis
21.
(b)
22.
(b)
Alcohol
23.
(c)
Law of independent assortment
24.
(c)
Nucellus – nutritive tissue for developing embryo
25.
(d) A is incorrect R is correct
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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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