12th Standard English Medium Biology Reduced Syllabus Creative One mark Question with Answer key - 2021(Public Exam )

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:

Multiple Choice Question

50 x 1 = 50

Assertion (A): Snake is a stenotherm.
Reason (R): Organism can tolerate narrow temperature fluctuations

(a)

Both A and R are correct R explain A

(b)

A is correct R is incorrect

(c)

R does not explain A

(d)

Both A and R are incorrect

Eutrophication is a result of__________

(a)

Agricultural and sewage waste

(b)

Vehicle emission

(c)

Pesticides

(d)

Industrial effluent

Statement 1: Prebiotics are the compounds in food that induce the growth of beneficial microbes
Statement 2: LAB is a probiotic

(a)

Statement 1 is correct. Statement 2 is incorrect.

(b)

Statement 1 is incorrect. Statement 2 is correct

(c)

Both the statements 1 and 2 are incorrect.

(d)

Both the statements 1 and 2 are correct

Assertion (A): Genophore is noticed in prokaryotes.
Reason (R): Bacteria possess circular DNA without chromatin organisation.

(a)

Both A and R are correct

(b)

A is correct R is incorrect

(c)

R explains A

(d)

A is incorrect R is correct

Identify the incorrect statement.
(i) The first clinical gene therapy was given by French Anderson.
(ii) For a four year old boy with ADA deficiency.
(iii) ACD is a autosomal dominant metabolic disorder.
(iv) Where patients have non-functioning B -lymphocytes.

(a)

i and iv only

(b)

ii, iii and iv

(c)

i, ii and iv

(d)

all the above

A pair of fungal disease _____________

(a)

Amoebiasis, Kala-azar

(b)

Candidiasis, Athlete's foot

(c)

Ascariasis, Filariasis

(d)

Poliomyelitis, Amoebiasis

Schizogony of Plasmodium parasite in human liver cells returns in ___________

(a)

sporozoites

(b)

merozoites

(c)

trophozoites

(d)

schizont

I^A and I^B genes of ABO blood group are __________

(a)

Co-dominant

(b)

Pleotropic

(c)

Dominant and recessive

(d)

Epistatic

Identify the hormone which is produced only during the time of pregnancy

(a)

Relaxin

(b)

Oxytocin

(c)

Progesterone

(d)

Cortisol

10.

Statement (1): Menstrual cycle occurs once in every 29 days.
Statement (2): The average age of menopause is 45-50 years.

(a)

Statement 1 is correct; statement 2 is incorrect

(b)

Statement 1 is incorrect; statement 2 is correct

(c)

Both the statements 1 and 2 are correct

(d)

Both the statements 1 and 2 are incorrect.

11.

Organ of copulation in human female is __________________

(a)

Cevix

(b)

Fundus

(c)

Vagina

(d)

Uterus

12.

Identify the correct sequence of reproductive events in human beings.

(a)

Insemination, Implantation, Fertilization, Parturition and Placentation

(b)

Implantation, Fertilization, Insemination, Placentation and Parturition.

(c)

Implantation, Insemination, Fertilization, Parturition and Placentation

(d)

Insemination, Fertilization, Implantation, Placentation and Parturition.

13.

Legalized marriageable age of female in India is __________

(a)

19 years

(b)

20 years

(c)

18 years

(d)

21 years

14.

Identify the mutant variety of castor.

(a)

Sharbathi Sonora variety

(b)

Aruna variety

(c)

Reimei variety

(d)

Erectiferm variety

15.

Egg laying hen is an example for _____________

(a)

Thelytoky

(b)

Ovovivipary

(c)

Vivipary

(d)

Ovipary

16.

Factor hypothesis was proposed by _________

(a)

Reginald Punnett

(b)

W. Bateson

(c)

Gregor Mendel

(d)

Carl Correns

17.

Identify the correct sequence of anther wall layers from periphery towards core part.

(a)

Epidermis ⟶ endothelium ⟶ stomium ⟶ tapetum

(b)

Epidermis ⟶ middle layer ⟶ endothecium ⟶ endothelium

(c)

Epidermis ⟶ endothelium ⟶ middle layers ⟶ tapetum

(d)

Epidermis ⟶ endothelium ⟶ endothecium ⟶ tapetum

18.

Assertion (A): Zea mays is a monocotyledonous plant.
Reason (R): Shield shaped cotyledon is called scutellum.

(a)

A is correct R is incorrect.

(b)

R explains A.

(c)

Both A and R are incorrect.

(d)

Both A and R are correct. R does not explain A.

19.

Which is not a part of mature seed?

(a)

Funiculus

(b)

Testa and tegmen

(c)

hilum

(d)

Chalaza

20.

Identify the plant tissue used for virus free germplasm

(a)

Apical meristem

(b)

Intercalary meristem

(c)

Lateral meristem

(d)

Plate meristem

21.

Consider the following four conditions (A-D) and select the correct pair of them as adaptation to environment in desert lizards.
The conditions:
A) Burrowing in soil to escape high temperature.
B) Losing heat rapidly from the body during high temperature
C) Bask in sun when temperature is low
D) Insulating body due to thick fatty dermis.

(a)

(A) and (C)

(b)

(B) and (D)

(c)

(A) and (B)

(d)

22.

For transformation, micro-particles coated with DNA to be bombarded with gene gun are made up of

(a)

Silver or Platinum

(b)

Platinum or Zinc

(c)

Silicon or Platinum

(d)

Gold or Tungsten

23.

What gases are produced in anaerobic sludge digesters?

(a)

Methane and CO₂ only

(b)

Methane, hydrogen sulphide and CO₂

(c)

Methane, hydrogen sulphide and O₂

(d)

Hydrogen sulphide and CO₂

24.

Satellite DNA is important because it

(a)

codes for proteins needs in cell cycle

(b)

shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children

(c)

Does not code for protein and is same in all members of the population.

(d)

Codes for enzymes needed for DNA replication.

25.

In context of amniocentesis, which of the following statements is incorrect?

(a)

It is usually done when a woman is between 14-16 weeks pregnant

(b)

It is used for prenatal sex determination

(c)

It can be used for detection of Down syndrome

(d)

It can be used for detection of cleft palate

26.

Several hormones like hCG, hPL oestrogen and progesterone are produced by

(a)

ovary

(b)

placenta

(c)

fallopian tube

(d)

pituitary

27.

A few statements describing certain features of reproduction are given below. Select the options that are true for both sexual and asexual reproduction from the options given:
(i) Gametic fusion takes place
(ii) Transfer of genetic material takes place
(iii) Reduction division takes place
(iv) Progeny have some resemblance, with parents

(a)

i and ii

(b)

ii and iii

(c)

ii and iv

(d)

i and ii

28.

Kyoto protocol was held in Japan in ________________

(a)

1995

(b)

1997

(c)

2012

(d)

2017

29.

Foaming tablets and jellies are _____ barriers for birth control.

(a)

mechanical

(b)

Chemical

(c)

hormonal

(d)

natural

30.

_____________ is called age of Invertebrates

(a)

Cambrian

(b)

Devonian

(c)

Pennsylvanian

(d)

Mississippian

31.

At present there are ___________ tiger reserves in the country.

(a)

(b)

(c)

(d)

32.

In India, Family Planning Programme was introduced in

(a)

1941

(b)

1951

(c)

1961

(d)

1971

33.

PAP smear can help to detect

(a)

Jaundice

(b)

Cancer

(c)

AIDS

(d)

Hepatitis B

34.

The first bio herbicide was got from_______

(a)

Trichoderma

(b)

Phytophthora species

(c)

Bacillus

(d)

Aspergillus

35.

"Birds and mammals attain greater body size in colder regions than warmer regions." - Choose the correct option.

(a)

Bergmann's rule

(b)

Jordon's rule

(c)

Sewall wright effect

(d)

Allen's rule

36.

Most popular sources of stem cells from their bank

(a)

amniotic cell bank

(b)

cord blood bank

(c)

plancenta blood bank

(d)

amniotic fluid cell bank

37.

The two chains of Insulin molecule are attached by_______

(a)

Covalent bonds

(b)

disulphide bonds

(c)

hydrogen bonds

(d)

both a and b

38.

The _____ prevents poly spermy.

(a)

vitelline membrane

(b)

fertilization membrane

(c)

zona pellucida

(d)

corona radiata

39.

______ stores the sperms temporarily until they mature.

(a)

testis

(b)

epididymis

(c)

vasa efferentia

(d)

vas deferens

40.

Capacitation is a _____ event.

(a)

physical

(b)

biochemical

(c)

both a and c

(d)

Enzyme mediated

41.

The ______ glands in human female are homologous to the prostate gland in male.

(a)

Bartholin's glands

(b)

Skene's glands

(c)

mammary glands

(d)

Cowper's gland

42.

Mode of infection of cholera is__________

(a)

Droplet infection

(b)

through contaminated food and water

(c)

through wound infection

(d)

through wound infection

43.

Fusion of morphologically and physiologically similar gametes is called ______

(a)

anisogamy

(b)

hologamy

(c)

isogamy

(d)

merogamy

44.

The concept of RNA world was independently proposed by __________

(a)

Orgel, Brick and Carl woese

(b)

Brick, Griffith and Crick

(c)

Wilkins and Franklin

(d)

Walter Gilbert

45.

In honey bees, the unfertilized egg produces

(a)

Queen bee

(b)

Worker bee

(c)

Drones

(d)

Worker bee and male honey bee

46.

______ is a seasonal breeder.

(a)

Poultry

(b)

Honey bees

(c)

Deers

(d)

Rabbit

47.

Regeneration is not seen in ______

(a)

Starfish

(b)

Lizard

(c)

Hydra

(d)

Sea Anemone

48.

During favourable conditions ______ shows multiple fission.

(a)

Plasmodium

(b)

Amoeba

(c)

Planaria

(d)

Euglena

49.

Scientists who contributed to karyotyping _______.

(a)

Tjio and Levan

(b)

John Cotto

(c)

Bridges

(d)

Wiener

50.

The blood group _________ is called universal recipient.

(a)

(b)

(c)

(d)

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(a)
Both A and R are correct R explain A

(d)
Both the statements 1 and 2 are correct

(b)
ii, iii and iv

(b)
Candidiasis, Athlete's foot

(b)
merozoites

(a)
Co-dominant

(a)
Relaxin

10.

11.

12.

(d)
Insemination, Fertilization, Implantation, Placentation and Parturition.

13.

14.

(b)
Aruna variety

15.

(d)
Ovipary

16.

(b)
W. Bateson

17.

18.

(b)
R explains A.

19.

(d)
Chalaza

20.

(a)
Apical meristem

21.

(a)
(A) and (C)

22.

(d)
Gold or Tungsten

23.

(b)
Methane, hydrogen sulphide and CO₂

24.

(b)
shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children

25.