12th Standard Biology English Medium Free Online Test 1 Mark Questions 2020 - Part Nine | QB365

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12th Standard Biology English Medium Free Online Test 1 Mark Questions 2020 - Part Nine

Published on: 05/11/2020

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.

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Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

25 x 1 = 25

Mammal in human male is ________________

(a)

Atavistic organ

(b)

Rudimentary Organ

(c)

Vestigial organ

(d)

Homologous structure

Which is not a physical method of waste water treatment.
(i) Floatation
(ii) Filtration
(iii) Phydro remediation
(iv) Oxidation

(a)

i and iii

(b)

ii and iv

(c)

i and ii

(d)

iii and iv

The promoter region of eukaryote is ___________

(a)

TATAA

(b)

AUGUT

(c)

UUUGA

(d)

AAAAU

Name the person who was the first to use the term antibiotic

(a)

Selman Waksman

(b)

Alexander Flemming

(c)

Earnest Chain

(d)

Howard Florey

Assertion (A): PCR is a amplification technique used in biotechnology.
Reason (R): Using PCR multiple copies of DNA can be generated.

(a)

R explains A.

(b)

Both A and R are incorrect

(c)

A is correct. R is incorrect

(d)

A and R are correct. R does not explains A

Yellow fever is a _____________ type of disease.

(a)

Neurotropic

(b)

Viscerotropic

(c)

Pneumotropic

(d)

Dermotropic

Assertion (A): Self-sterility is observed in Nicotiana species.
Reason (R): Because the genes are located on chromosome.

(a)

A is true R is false

(b)

Both A and R are false

(c)

A is true, R is not correct explanation for A

(d)

R explains A

Observe the diagram and select the correct option mentioning the parts A, B, C and D.

(a)

A	B	C	D
Synergid	Egg	polar nuclei	Antipodals

(b)

A	B	C	D
Antipodals	Synergid	polar nuclei	Egg

(c)

A	B	C	D
Egg	Synergid	Antipodals	polar nuclei

(d)

A	B	C	D
Antipodals	polar nuclei	Egg	Synergid

The grizzled squirrel and lion tailed Macaque are endemic to _____________

(a)

Semi-Arid zone

(b)

Indian Desert

(c)

Western Ghats

(d)

Eastern Ghats

10.

The incubation period for _____ can be more than 10 years.

(a)

HPV

(b)

HBV

(c)

Treponema

(d)

HIV

11.

The term after birth refers to ______

(a)

Parturition

(b)

Lactation

(c)

Remains of placenta

(d)

Corpus albicans

12.

Identify the correct option to label the diagram
1 - Bud forming
2 - Osculum
3 - Bud growing
4 - Daughter individual
5 - Individual parent

(a)

1-A 2-D 3-B 4-C 5-E

(b)

1-B 2-D 3-C 4-E 5-A

(c)

1-D 2-E 3-B 4-C 5-A

(d)

1-A 2-E 3-D 4-B 5-C

13.

Replication errors are corrected by repair enzymes such a ______.

(a)

Polymerases

(b)

Kornberg enzyme

(c)

helicases

(d)

Nucleases

14.

Budding is seen in ______

(a)

Noctiluca

(b)

Amoeba

(c)

Nostoc

(d)

Planaria

15.

__________ are examples of mendelian disorders.

(a)

Thalassemia

(b)

Albinism

(c)

Phenylketonuria

(d)

Haemophilia

16.

Deforestation means ______.

(a)

growing plants and trees in an area where there is no forest

(b)

growing plants and trees in an area where the forest is removed

(c)

growing plants and trees in a pond

(d)

Removal of plants and trees

17.

Read the following statements and fill up the blanks with correct option.
i) Total soil water content in soil is called ______
ii) Soil water not available to plants is called _______
iii) Soil water available to plants is called _____.

(a)

(i) (ii) (iii) Holard Echard Chresard

(b)

i ii iii Echard Holard Chresard

(c)

i ii iii Chresard Echard Holard

(d)

i ii iii Holard Chresard Echard

18.

CO₂ is not released during

(a)

Alcoholic fermentation

(b)

Lactate fermentation

(c)

Aerobic respiration in animals

(d)

Aerobic respiration in plants

19.

The organization which published the red list of species is

(a)

WWF

(b)

IUCN

(c)

ZSI

(d)

UNEP

20.

Fossils are generally found in

(a)

igneous rocks

(b)

metamorphic rocks

(c)

volcanic rocks

(d)

sedimentary rocks

21.

Read the given statements and select the correct option.
Statement 1: Diaphragms, cervical caps and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
Statement 2: They are chemical barriers of conception and are reusable.

(a)

Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

(b)

Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

(c)

Statement 1 is correct but statement 2 is incorrect

(d)

Both statements 1 and 2 are incorrect

22.

Which of the following is the correct sequence of event with reference to the central dogma?

(a)

Transcription, Translation, Replication

(b)

Transcription, Replication, Translation

(c)

Duplication, Translation, Transcription

(d)

Replication, Transcription, Translation

23.

The process which the sperm undergoes before penetrating the ovum is _____.

(a)

Spermiation

(b)

Cortical reaction

(c)

Spermiogenesis

(d)

Capacitation

24.

AIDS virus has

(a)

Single stranded RNA

(b)

Double stranded RNA

(c)

Single stranded DNA

(d)

Double stranded DNA

25.

Which of the following is true about Rh factor in the offspring of a parental combination DdxDd (both Rh positive)?

(a)

All will be Rh-positive

(b)

Half will be Rh positive

(c)

About ¾ will be Rh negative

(d)

About one fourth will be Rh negative

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Answers Key:

Multiple Choice Question

25 x 1 = 25

(d)
iii and iv

(a)
TATAA

(a)
Selman Waksman

(a)
R explains A.

(b)
Viscerotropic

(a)

A B C D

Synergid Egg polar nuclei Antipodals

10.

(d)
HIV

11.

12.

(b)
1-B 2-D 3-C 4-E 5-A

13.

(d)
Nucleases

14.

(a)
Noctiluca

15.

(d)
Haemophilia

16.

(d)
Removal of plants and trees

17.

(a)
(i) (ii) (iii) Holard Echard Chresard

18.

(b)
Lactate fermentation

19.

(b)
IUCN

20.

(d)
sedimentary rocks

21.

22.

(d)
Replication, Transcription, Translation

23.

(d)
Capacitation

24.

(a)
Single stranded RNA

25.

(d)
About one fourth will be Rh negative

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