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Published on: 22/06/2021
QB365 provides detailed and simple solution for every Creative Questions in class 12 Biology Subject. It will helps to get more idea about question pattern in every Creative questions with solution.
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.
Observe the diagram and name A and B.
A - Plasmid B - Vector
A - Nucleoid - B - Plasmid
A - Bacterial chromosome B - Vector
A - Nucleoid - B - x phage DNA
2.
Assertion (A): Self-sterility is observed in Nicotiana species.
Reason (R): Because the genes are located on chromosome.
A is true R is false
Both A and R are false
A is true, R is not correct explanation for A
R explains A
3.
Statement 1: Self-sterility in Nicotiana is controlled by multiple alleles.
Statement 2: Multiple alleles are always responsible for the same character.
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
4.
Statement 1: Pairing of homologous chromosome is called as syndesis.
Statement 2: Proterminal synapsis occurs from telomeres.
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
5.
Identify the mutant variety of castor.
Sharbathi Sonora variety
Aruna variety
Reimei variety
Erectiferm variety
6.
During cross over, chiasma occurs between
Sister chromatids of non-homologous chromosomes
Non-sister chromatids of non- homologous chromosomes
Non-sister chromatids of homologous chromosomes
Sister chromatids of homologous chromosomes
7.
Incomplete linkage was reported by Hutchinson in ___________
Drosophila
Maize
Neurospora
Lathyrus odoratus
8.
Which is not a feature of the chromosomal theory of inheritance?
Somatic cells of organisms are derived from zygote by repeated meiosis.
Chromosomes retain their structural uniqueness throughout the life of an organism.
Mendelian factors are located in chromosomes
Sutton and Boveri independently proposed the theory.
9.
According to Mendel which character shown dominance
Yellow flower color
Yellow cotyledon color
Wrinkled seeds
Inflated pod
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.
Gregor Mendel ___________
(i) was born in Czechoslovakia
(ii) did his experiments in Pisum fulvum
(iii) was the first systemic researcher in genetics
(iv) Published his results in the paper "Experiments on Plant Hybrids"
All are correct
(ii), (iii), (iv) are correct
(i), (iii),(iv) are correct
(i), (iii), (iv) are correct
12.
Observe the diagram and select the correct option mentioning the parts A, B, C and D
| A | B | C | D |
|---|---|---|---|
| Radicle | Cotyledon | Testa | Plumule |
| A | B | C | D |
|---|---|---|---|
| Plumule | Cotyledon | Testa | Radicle |
| A | B | C | D |
|---|---|---|---|
| Cotyledon | Testa | Plumule | Radicle |
| A | B | C | D |
|---|---|---|---|
| Plumule | Radicle | Testa | Cotyledon |
13.
Assertion (A): Zea mays is a monocotyledonous plant.
Reason (R): Shield shaped cotyledon is called scutellum.
A is correct R is incorrect.
R explains A.
Both A and R are incorrect.
Both A and R are correct. R does not explain A.
14.
Identify the mismatched pair:
(i) Sucker - Chrysanthemum
(ii) Bulbils - Agave
(iii) Stolon - Fragaria
(iv) Runner - Lilium
i only
ii only
iii only
iv only
15.
Identify the incorrect statement regarding vegetative reproduction.
Only one parent is required for propagation.
New individuals are genetically dissimilar.
Easy mode of reproduction
Variation does not exist.
16.
Assertion (A): Entomophily is the most common type of pollination.
Reason (R): Birds and animals bring out effective pollination.
Both A and R are incorrect.
A is correct R is incorrect.
R explains A.
Both A and R are correct. R is not a correct explanation for A.
17.
Generally, the pollen grains are liberated from another at ___________
2-celled stage
4-celled stage
6-celled stage
8-celled stage
18.
Select the wrong statement(s) regarding cross-pollination.
(a) Pollination depends on external agent and so it is certain.
(b) New varieties are produced.
(c) Continuous cross-pollination leads to weaker progeny.
(d) Germination capacity is highly declined.
a and d
b and c
a, band d
a, c and d
19.
The type of endosperm noticed in Hydrilla seed is ___________
Ruminate endosperm
Nuclear endosperm
Cellular endosperm
Helobial endosperm
20.
Identify the correct sequence of various zones from surface to depth in a pond ecosystem.
Profundal, limnetic, littoral and benthic
Benthic, littoral, profundal and limnetic
Limnetic, profundal, littoral and benthic
Littoral, limnetic, profundal and benthic
21.
Which is irrelevant to the first law of thermodynamics?
Energy can be transmitted from one system to other in many forms.
Energy transformation results in reduction of free energy.
Energy can neither be created nor destroyed.
Energy in the universe is constant.
22.
The optimal pH of culture medium is generally ___________.
Acidic
Basic
Neutral
Slightly basic
23.
EIA stands for ________________
Ecological Information Analysis
Environmental Information Assessment
Environmental Impact Analysis
Environmental Impact Assessment
24.
Total number of forestry extension centres in Tamil Nadu is ______________
16
32
18
51
25.
Which is not a free-living nitrogen-fixing species?
Azotobacter
Clostridium
Nostoc
Anabaena
1.
(b)
A - Nucleoid - B - Plasmid
2.
(c)
A is true, R is not correct explanation for A
3.
(c)
Both the statements are correct
4.
(a)
Statement 1 is correct and Statement 2 is incorrect
5.
(b)
Aruna variety
6.
(c)
Non-sister chromatids of homologous chromosomes
7.
(b)
Maize
8.
(a)
Somatic cells of organisms are derived from zygote by repeated meiosis.
9.
(d)
Inflated pod
10.
(c)
Both genotype & Phenotype ratio
11.
(c)
(i), (iii),(iv) are correct
12.
(b)
| A | B | C | D |
|---|---|---|---|
| Plumule | Cotyledon | Testa | Radicle |
13.
(b)
R explains A.
14.
(d)
iv only
15.
(b)
New individuals are genetically dissimilar.
16.
(d)
Both A and R are correct. R is not a correct explanation for A.
17.
(a)
2-celled stage
18.
(d)
a, c and d
19.
(d)
Helobial endosperm
20.
(d)
Littoral, limnetic, profundal and benthic
21.
(b)
Energy transformation results in reduction of free energy.
22.
(a)
Acidic
23.
(d)
Environmental Impact Assessment
24.
(b)
32
25.
(d)
Anabaena
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