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Published on: 05/11/2020
12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Six
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.
Locomotory speed of an organism changes due to light. This phenomenon is referred as _____________
Photonasty
Photokinesis
Phototropism
Phototaxis
2.
Treatment of sewage involves
Floatation, Filtration and Sedimentation of suspended particles
Aerating it for bacterial action
Removal of nitrates and phosphates
All of the above
3.
AUG code is for ________
Arginine
Tyrosine
Tryptophan
Methionine
4.
Species introduced deliberately in an area are referred as_______
Endemic species
Vulnerable species
Exotic species
Extinct species
5.
Identify the correct statement(s).
(i) Totipotency is the ability of single cell to produce a whole organism.
(ii) Pluripotency refers to ability of stem cell with a potential to differentiate into any kind of germ layers.
(iii) Unipotency refers to ability of stem cell to differentiate into one cell type.
(iv) Oligopotency refers to stem cells to differentiate into few cell types.
i and iii
ii and iv
i and iv
all the above
6.
________________ test is done to confirm typhoid.
ELISA
Western blot
Widal test
Southern blot
7.
A vector should________
(i) contain suitable marker
(ii) contain ori site
(iii) have poly linkess
(iv) be small in size
i, ii and iii
ii, iii and iv
i, ii and iv
all the above
8.
According to WHO, India is the ____________ largest HIV affected country.
first
second
third
seventh
9.
Mechanism of crossing over involves the following stages. Select the correct sequence.
Tetrad stage ~ Synapsis ~ Bivalent stage ~ cross over
Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation
Terminalisation ~ Tetrad ~ Bivalent ~ Cross over
Cross over ~ Bivalent ~ Tetrad ~ Terminalisation
10.
In case of co-dominance, monohybrid F 1 __________ is 1: 2: 1
Genotype ratio
Phenotype ratio
Both genotype & Phenotype ratio
Ratio is wrong
11.
Observe the diagram and select the correct option mentioning the parts A, B, C and D.
| A | B | C | D |
|---|---|---|---|
| Synergid | Egg | polar nuclei | Antipodals |
| A | B | C | D |
|---|---|---|---|
| Antipodals | Synergid | polar nuclei | Egg |
| A | B | C | D |
|---|---|---|---|
| Egg | Synergid | Antipodals | polar nuclei |
| A | B | C | D |
|---|---|---|---|
| Antipodals | polar nuclei | Egg | Synergid |
12.
The study of soil is called as __________
Lithotripsy
Lithosphere
Pedology
Pedigree analysis
13.
Observe the figures and select the correct type of pyramid of numbers.
| A | B | C |
| Grassland ecosystem | Forest ecosystem | Parasite ecosystem |
| A | B | C |
| Grassland ecosystem | Pond ecosystem | Forest ecosystem |
| A | B | C |
| Forest ecosystem | Grassland ecosystem | Parasite ecosystem |
| A | B | C |
| Pond ecosystem | Forest ecosystem | Grassland ecosystem |
14.
Assertion (A) : Incubation is followed by Inoculation.
Reason (R) : Explant is inoculated to media.
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
15.
Which is not a true statement regarding rainwater harvesting?
Mitigates groundwater quality
Reduces soil erosion
Decreases soil salinity
No wastage of land for storing
16.
Statement (1): Clonal selection is carried out in asexually propagating plants.
Statement (2): Clones show similar genotypes.
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
17.
Assertion (A): Black pepper is a spice.
Reason (R): Condiments are flavouring substances, generally added after the cooking of food.
A is right R is wrong
R explains A
Both A and R are right. R is not correct explanation for A.
Both A and R are wrong
18.
According to Neo Darwinism change in the frequency of genes in population arise due to all Except.
Natural selection
Mutation
Struggle for existence
Variation
19.
The codon _________ codes for phenylalanine
UAA
UUU
UCU
UAC
20.
Kin selection is seen in _______
Honey bees
Drosophila
Grasshopper
Cockroach
21.
______ is the first one to encounter the antigen that enters tissue spaces.
Spleen
Lymph node
Bone marrow
GALT
22.
The first disease for which vaccine was prepared is _______
Polio
Chicken pox
Cholera
Small pox
23.
24.
The organization which published the red list of species is
WWF
IUCN
ZSI
UNEP
25.
1.
(b)
Photokinesis
2.
(d)
All of the above
3.
(d)
Methionine
4.
(c)
Exotic species
5.
(d)
all the above
6.
(c)
Widal test
7.
(d)
all the above
8.
(c)
third
9.
(b)
Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation
10.
(c)
Both genotype & Phenotype ratio
11.
(a)
| A | B | C | D |
|---|---|---|---|
| Synergid | Egg | polar nuclei | Antipodals |
12.
(c)
Pedology
13.
(a)
| A | B | C |
| Grassland ecosystem | Forest ecosystem | Parasite ecosystem |
14.
(b)
R explains A
15.
(a)
Mitigates groundwater quality
16.
(c)
Both the statements are correct
17.
(c)
Both A and R are right. R is not correct explanation for A.
18.
(c)
Struggle for existence
19.
(b)
UUU
20.
(a)
Honey bees
21.
(b)
Lymph node
22.
(d)
Small pox
23.
(a)
24.
(b)
IUCN
25.
(d)
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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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