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Published on: 05/11/2020
12th Standard Biology English Medium Free Online Test 1 Mark Questions 2020 - 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.
Assertion (A): DMH -11 is a transgenic mustard.
Reason (R): It is developed by using barnase/ barstar technology.
Both A and R are wrong.
A is right R is wrong.
R explains A.
A and R are right, R does not explain A.
2.
Observe the gene sequence and identify the types of aberration ABC BCD E F?
Tandem duplication
Simple duplication
Reverse tandem duplication
Displaced tandem duplication
3.
The 1 : 2 : 1 ratio of co-dominance process Mendel's ___________
Law of dominance
Law of recessiveness
Law of segregation
Law of independent assortment
4.
Statement 1: Holoparasites depend totally on other organisms for nutrition.
Statement 2: Durnta is holoparasite.
Statement 1 is correct. Statement 2 is incorrect.
Statement 1 is incorrect. Statement 2 is correct
Both the statements are correct.
Both the statements are incorrect
5.
Assertion (A): Pyramid of energy is upright.
Reason (R): During the energy transfer at successive trophic levels from producers there will be a gradual decrease
Both A and R are wrong
A is right R is wrong
R explains A
A is right R is not the correct explanation for A
6.
Assertion (A) : Development of root from callus is called caulogenesis.
Reason (R) : Caulogenesis is the final step of 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
7.
Assertion (A): Social forestry refers to management of forests and afforestation on barren lands.
Reason (R): Afforestation involves the cutting of trees.
A is correct R is incorrect.
A is incorrect R is correct.
R explains A.
Both A and R are incorrect.
8.
Identify the Tamil name for flaked rice
Nel
Aval
Pori
Umi
9.
Lysozyme is an example of _______
Anatomical barrier
Physiological barrier
Phagocytic barrier
Inflammatory barrier
10.
B cells that produce and release large amounts of antibody are called
Memory cells
Basophils
Plasma cells
killer cells
11.
Observe the following statements and pick out the right option from the following:
Statement I: The drug sources of Siddha include plants, animal parts, ores and minerals.
Statement II: Minerals are used for preparing drugs with long shelf-life.
Statement I is correct
Statement II is correct
Both statements are correct
Both statements are wrong
12.
While studying the history of domestication of various cultivated plants _______ were recognized earlier
Centres of origin
Centres of domestication
Centres of hybrid
Centres of variation
13.
Significance of food web is / are ______.
it does not maintain stability in nature
it shows patterns of energy transfer
it explains species interaction
b and c
14.
Which of the following is correct for r-selected species
Large number of progeny with small size
large number of progeny with large size
small number of progeny with small size
small number of progeny with large size
15.
In a fresh water environment like pond, rooted autotrophs are ______.
Nymphaea and typha
Ceratophyllum and Utricularia
Wolffia and pistia
Azolla and lemna
16.
Read the given statements and select the correct option.
Statement A : Cattle do not graze on weeds of Calotropis.
Statement B : Calotropis have thorns and spines, as defense against herbivores.
Both statements A and B are incorrect.
Statement A is correct but statement B is incorrect
Both statements A and B are correct but statement B is not the correct explanation of statement A.
Both statements A and B are correct and statement B is the correct explanation of statement A.
17.
The Ozone Day is observed every year on September 16 as on this day in 1987 the ___________was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra-violet rays of the sun from reaching the earth. Fill the correct word in blank.
Montreal Protocol
Geneva Protocol
Kyoto Protocol
Nagoya Protocol
18.
Recombinant Factor VIII is produced in the ______ cells of the Chinese Hamster
Liver cells
blood cells
ovarian cells
brain cells.
19.
Which of the following statement is correct
Agar is not extracted from marine algae such as seaweeds
Callus undergoes differentiation and produces somatic embryoids.
Surface sterilization of explants is done by using mercuric bromide
PH of the culture medium is 5.0 to 6.0
20.
Evolutionary history of an organism is called
Ancestry
ontogeny
phylogeny
paleontology
21.
22.
Allergy involves
IgE
IgG
lgA
IgM
23.
Changing the codon AGC to AGA represents _______.
missense mutation
nonsense mutation
frameshift mutation
deletion mutation
24.
Select the correct statement from the ones given below with respect to dihydrid cross.
Tightly linked genes on the same chromosomes show very few combinations
Tightly linked genes on the same chromosomes show higher combinations
Genes far apart on the same chromosomes show very few recombinations
Genes loosely linked on the same chromosomes show similar recombinations as the tightly linked ones
25.
1.
(c)
R explains A.
2.
(a)
Tandem duplication
3.
(b)
Law of recessiveness
4.
(c)
Both the statements are correct.
5.
(c)
R explains A
6.
(d)
Both A and R are incorrect
7.
(a) A is correct R is incorrect.
8.
(b)
Aval
9.
(b)
Physiological barrier
10.
(c)
Plasma cells
11.
(b)
Statement II is correct
12.
(a)
Centres of origin
13.
(d)
b and c
14.
(a)
Large number of progeny with small size
15.
(a)
Nymphaea and typha
16.
(b)
Statement A is correct but statement B is incorrect
17.
(a)
Montreal Protocol
18.
(c)
ovarian cells
19.
(b)
Callus undergoes differentiation and produces somatic embryoids.
20.
(a)
Ancestry
21.
(d)
22.
(a)
IgE
23.
(a)
missense mutation
24.
(a)
Tightly linked genes on the same chromosomes show very few combinations
25.
(b)
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Tamilnadu Stateboard 12th Standard Subjects
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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
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