12th Standard Syllabus & Materials
12th Standard
TN 12th English Poem - 6 - Incident of the French Camp Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 6 - On the Rule of the Road Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 5 - The Chair Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Supplementary - 4 - The Midnight Visitor Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Poem - 4 - Ulysses Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 4 - The Summit Sample Question Papers Study Material - QB365 Set A
Published on: 05/11/2020
12th Standard Biology English Medium Free Online Test Book Back One Mark Questions - Part Three
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.
A specific place in an ecosystem, where an organism lives and performs its functions is _____.
habitat
niche
landscape
biome
2.
3.
Who proposed the Germplasm theory?
Darwin
August Weismann
Lamarck
Alfred Wallace
4.
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
5.
6.
E. coli cell grown on 15N medium are transferred to 14N medium and allowed to grow for two generations. DNA extracted from these cells is ultracentrifuged in a cesium chloride density gradient. What density distribution of DNA would you expect in this experiment?
One high and one low density band
One intermediate density band.
One high and one intermediate density band.
One low and one intermediate density band
7.
The foetal membrane that forms the basis of the umbilical cord is _____.
Allantois
Amnion
Chorion
Yolk sac
8.
Pataus syndrome is also referred to as ______.
13-Trisomy
18-Trisormy
21-Trisormy
None of these
9.
Which of the following is not correct?
Three or more alleles of a trait in the population are called multiple alleles
A normal gene undergoes mutations to form many alleles
Multiple alleles map at different loci of a chromosome
A diploid organism has only two alleles out of many in the population
10.
In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
Assertion (A) : In bee society, all the members are diploid except drones.
Reason (R) : Drones are produced by parthenogenesis
Codes:
A. If both A and R are true and R is correct explanation for A
B. If both A and R are true but R is not the correct explanation for A
C. If A is true but R is false
D. If both A and R are false.
If both A and R are true and R is correct explanation for A
If both A and R are true but R is not the correct explanation for A
If A is true but R is false
If both A and R are false
1.
(b)
niche
2.
(a)
3.
(b)
August Weismann
4.
(d)
Both syphilis and gonorrhoea are easily cured with antibiotics
5.
(c)
6.
(d)
One low and one intermediate density band
7.
(a)
Allantois
8.
(a)
13-Trisomy
9.
(c)
Multiple alleles map at different loci of a chromosome
10.
A. If both A and R are true and R is correct explanation for A
12th Standard Syllabus & Materials
12th Standard
TN 12th English Supplementary - 3 - The Hour of Truth (Play) Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Poem - 3 - All the World’s a Stage Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 3 - In Celebration of Being Alive Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Supplementary - 2 - Life of Pi Sample Question Papers Study Material - QB365 Set A
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
Tamilnadu Stateboard Standards
