12th Standard Biology English Medium Important 1 Mark Creative Questions (New Syllabus) 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.

Questions:

Multiple Choice Question

57 x 1 = 57

Which of the following statements does not hold true for restriction enzyme?

(a)

It recognizes a palindromic nucleotide sequence

(b)

It is an endonuclease

(c)

It is isolated from viruses

(d)

It produces the same kind of sticky ends in different DNA molecules

Calculate the allelic frequency of Aa, if 'A' allelic has frequency of 0.3 and 'a' allele has frequency of 0.7

(a)

0.67

(b)

0.42

(c)

0.36

(d)

0.59

BOD stands for_______

(a)

Biological Oxidation Demand

(b)

Biotic Oxygen Deficient

(c)

Biological Oxygen Deficit

(d)

Biochemical Oxidation Deficit

Which of the following antibiotic inhibits the interaction between tRNA and mRNA?

(a)

Neomycin

(b)

Streptomycin

(c)

Tetracycline

(d)

Chloramphenicol

The flavour in the yogurt is due to __________________

(a)

Formal dehyde

(b)

Lactate

(c)

Acetaldehyde

(d)

Caesin

Statement 1: Biodiversity is the assemblage of different life form.
Statement 2: The term biodiversity was introduced by Edward Wilson.

(a)

Statement 1 is correct, statement 2 in incorrect

(b)

Statement 1 is incorrect, statement 2 in correct

(c)

Both the statements are correct

(d)

Both the statements are incorrect

Identify the incorrect statement

(a)

Antibody Mediated Immunity was elicited by T cells.

(b)

It is a character of vertebrates only

(c)

Immunoglobulins act against pathogens and kill them.

(d)

It is also called humoral immunity

Identify the mismatched pair

(a)

Hepatitis - Liver

(b)

Poliomyelitis - Brain and spinal cord

(c)

Measles - Intestine

(d)

Mumps - Salivary gland

Identify the incorrect statement:

(a)

French chemist Louis Pasteur demonstrated the fermentation.

(b)

Fermentor is a vessel providing optimal condition for microbial action.

(c)

Solvent extraction is an upstream process of fermentation.

(d)

Distillation and filtration comes under down stream process.

10.

Assertion (A): Cervix is common site of ectopic pregnancies
Reason (R): Implantation of fertilized ovum outside uterus

(a)

A is wrong, R is right.

(b)

A is right, R is wrong

(c)

A and R are right. R does not explains A.

(d)

Both A and R are wrong.

11.

Identify the correct statement.

(a)

Lactational amenorrhea is a permanent birth control method

(b)

Condoms are made of polyethylene glycol and lambskin

(c)

LNG -20 is a copper-releasing IUD

(d)

Diaphragm covers the cervix there by preventing sperm entry

12.

Assertion (A): Organisms show three phases in their life cycle.
Reason (R): Juvenile phase is a degenerative phase.

(a)

A is correct R but is incorrect

(b)

Both A and R are correct

(c)

R is the correct explanation for A

(d)

A is not correct but R is correct

13.

Number of chromosomes (2n) in Ophioglossum is _________

(a)

1226

(b)

1622

(c)

1262

(d)

2126

14.

How many characters studied by Mendel in pisum sativum

(a)

Three

(b)

Five

(c)

Seven

(d)

Nine

15.

Statement 1: Holoparasites depend totally on other organisms for nutrition.
Statement 2: Durnta is holoparasite.

(a)

Statement 1 is correct. Statement 2 is incorrect.

(b)

Statement 1 is incorrect. Statement 2 is correct

(c)

Both the statements are correct.

(d)

Both the statements are incorrect

16.

Assertion (A): Epidermis is protective in function.
Reason (R): Epidermis is outermost unilayer of another wall.

(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.

17.

The type of endosperm noticed in Hydrilla seed is ___________

(a)

Ruminate endosperm

(b)

Nuclear endosperm

(c)

Cellular endosperm

(d)

Helobial endosperm

18.

Lotic ecosystem refers to________

(a)

Open water ecosystem

(b)

Running water ecosystem

(c)

Standing water ecosystem

(d)

Ocean water ecosystem

19.

The upright pyramid is not a feature of _______

(a)

Pond ecosystem

(b)

Grassland ecosystem

(c)

Forest ecosystem

(d)

Terminal ecosystem

20.

Identify the incorrect option among the following component sequence.

(a)

air, water, sunlight and temperature

(b)

latitude, altitude, direction of mountain and aptitude

(c)

soil air, pH of soil, saltwater and soil moisture

(d)

carbohydrate, protein, lipids and humic substances

21.

The phenomenon of reversion of mature cells to meristematic state leading to callus formation is___________

(a)

Redifferentiation

(b)

Dedifferentiation

(c)

either (a) or (b)

(d)

none of these

22.

A widely used fusogen in protoplast culture is ________

(a)

Polymethyl glycol

(b)

Polyethylene glycol

(c)

Polyethylene chloride

(d)

Polyvinyl chloride

23.

Atlas 66 is an improved variety of ____________

(a)

Rice

(b)

Maize

(c)

Wheat

(d)

Spinach

24.

Intraspecific hybridization is also termed as __________

(a)

Intravarietal hybridization

(b)

Intervarietal hybridization

(c)

Interspecific hybridization

(d)

Intergeneric hybridization

25.

When does World Ozone Day is observed?

(a)

June 17^th

(b)

December 1^st

(c)

October 12^th

(d)

September 16^th

26.

Total number of forestry extension centres in Tamil Nadu is ______________

(a)

(b)

(c)

(d)

27.

Identify the incorrect statement:

(a)

Bio-inoculants are efficient in solubilising phosphate

(b)

Bio-inoculants are ecofriendly organic agro outputs

(c)

Bio-inoculants are obtained from dead organic matters

(d)

Bio-inoculants are designed to improve soil fertility

28.

Statement 1: Chinese discovered the paper.
Statement 2: Eucalyptus and Casuarina are the widely used tree species for making paper pulp.

(a)

Statement 1 is correct and Statement 2 is also correct

(b)

Statement 1 is correct and Statement 2 is incorrect

(c)

Statement 1 is incorrect and Statement 2 is correct

(d)

Both the Statements are incorrect

29.

Measuring Biochemical Oxygen Demand (BOD) is a method used for

(a)

Estimating the amount of organic matter in sewage water.

(b)

Working out the efficiency of oil driven automobile engines.

(c)

Measuring, the activity of Saccharomyces cerevisiae in producing curd on a commercial scales

(d)

Working out the efficiency of RBCs about their capacity to carry oxygen

30.

Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein

(a)

Binds with epithelial cells of midgut of the insect pest ultimately killing it.

(b)

Is coded by several genes including the gene cry.

(c)

Is activated by acid pH of the foregut of the insect pest.

(d)

Does not kill the carrier bacterium which is itself resistant to this toxin.

31.

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

32.

The Okazaki fragments in DNA chain growth

(a)

Result in transcription

(b)

Polymerises in the 3' to 5' direction and forms replication fork

(c)

Prove semi-conservative nature of DNA replication

(d)

Polymerises in the 5' to 3' direction and explain 3'to 5' DNA replication

33.

A normal-visioned man whose father was blind marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chances that this child would be colour blind?

(a)

100%

(b)

(c)

25%

(d)

50%

34.

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

(a)

ovary

(b)

placenta

(c)

fallopian tube

(d)

pituitary

35.

"Nothing lives forever, but life continues". What does it mean?

(a)

Older dies but new ones are produced by reproduction

(b)

Nothing can produce without death

(c)

Death has nothing to do with the continuation of life

(d)

Parthenogenesis is must for sexual reproduction

36.

Apple maggot flies are example of ___________

(a)

Hybrid breakdown

(b)

Physiological isolation

(c)

Allopatric speciation

(d)

Species Extinction

37.

According to big bang theory, the primitive earth had all the following Except:

(a)

Ammonia

(b)

Methane

(c)

Oxygen

(d)

Hydrogen and water vapour

38.

The tolerable level of sound is _____________

(a)

140 db

(b)

120 db

(c)

100 db

(d)

2220 db

39.

IUD's increase _____ of the sperm within the uterus.

(a)

Endocytosis

(b)

Pinocytosis

(c)

Phagocytosis

(d)

Exocytosis

40.

_________________ era is called age of mammals

(a)

Precambrian

(b)

Permian

(c)

Cenozoic

(d)

Paleozoic

41.

The grizzled squirrel and lion tailed Macaque are endemic to _____________

(a)

Semi-Arid zone

(b)

Indian Desert

(c)

Western Ghats

(d)

Eastern Ghats

42.

This is not Major task of RCH.

(a)

Vaccinating the mother and child for infectious diseases

(b)

Introducing six education in Schools

(c)

Educating couples about the available with control

(d)

Creating awareness about care for pregnant Women

43.

The family planning programme was initiated by India in _____

(a)

1953

(b)

1972

(c)

1963

(d)

1951

44.

The first bio herbicide was got from_______

(a)

Trichoderma

(b)

Phytophthora species

(c)

Bacillus

(d)

Aspergillus

45.

Van't Hoffs rule describes the impact of ____________ on the environment.

(a)

Light

(b)

Temperature

(c)

Water

(d)

Soil

46.

Most of the adult stem cells are______and can act as a repair system of the body

(a)

Totipotent

(b)

Multipotent

(c)

Oligopotent

(d)

Pluvipotent

47.

Choose the option not applicable to ELISA

(a)

It is a bio chemical produce to detect antigens in a sample

(b)

The intensity of colour obtained in the test is proportional to amount of antigen.

(c)

It can detect DNA

(d)

ELISA is a test for detecting human chorionic gonadotropin hormone

48.

The ______ glands occur posterior to the vagina.

(a)

Skene's glands

(b)

Cowper's gland

(c)

prostate gland

(d)

Bartholin's glands

49.

Expulsion of baby from the mother's womb is called _____

(a)

implementation

(b)

parturition

(c)

insemination

(d)

gestation

50.

The ______ glands in human female are homologous to the bulbouretural glands.

(a)

Bartholin's glands

(b)

Skene's glands

(c)

mammary glands

(d)

Cowper's gland

51.

For the following diseases, respiratory system is the site of infection, except_____

(a)

Dengue fever

(b)

Chicken pox

(c)

Common cold

(d)

Measles

52.

Vector control research Centre is located in__________

(a)

Chennai

(b)

Delhi

(c)

Puducherry

(d)

Hyderabad

53.

The experiment conducted by Griffith was based on_________.

(a)

Transduction

(b)

Replication

(c)

Transformation

(d)

Conjucation

54.

In honey bees, the unfertilized egg produces

(a)

Queen bee

(b)

Worker bee

(c)

Drones

(d)

Worker bee and male honey bee

55.

Regeneration is not seen in ______

(a)

Starfish

(b)

Lizard

(c)

Hydra

(d)

Sea Anemone

56.

The ZW - ZZ type of sex determination is seen ________.

(a)

Butterflies

(b)

Drosophila

(c)

Gypsy moth

(d)

Human being

57.

The first disease for which vaccine was prepared is _______

(a)

Polio

(b)

Chicken pox

(c)

Cholera

(d)

Small pox

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Multiple Choice Question

57 x 1 = 57

(b)
0.42

(a)
Biological Oxidation Demand

(a)
Neomycin

(a)
Statement 1 is correct, statement 2 in incorrect

(a)
Antibody Mediated Immunity was elicited by T cells.

10.

(a)
A is wrong, R is right.

11.

(d)
Diaphragm covers the cervix there by preventing sperm entry

12.

(a)
A is correct R but is incorrect

13.

14.

15.

16.

(b)
R explains A.

17.

(d)
Helobial endosperm

18.

(b)
Running water ecosystem

19.

(a)
Pond ecosystem

20.

(b)
latitude, altitude, direction of mountain and aptitude

21.

(b)
Dedifferentiation

22.

(b)
Polyethylene glycol

23.

24.

(b)
Intervarietal hybridization

25.

(a)
June 17^th

26.

(b)
32

27.

28.

(a)
Statement 1 is correct and Statement 2 is also correct

29.

(a)
Estimating the amount of organic matter in sewage water.

30.

(a)
Binds with epithelial cells of midgut of the insect pest ultimately killing it.

31.

(b)
Methane, hydrogen sulphide and CO₂

32.

(a)
Result in transcription

33.

(b)
0%

34.

(b)
placenta

35.

(a)
Older dies but new ones are produced by reproduction

36.

37.

38.

(b)
120 db

39.

40.

41.

42.

(a)
Vaccinating the mother and child for infectious diseases

43.

(d)
1951

44.

(b)
Phytophthora species

45.

(b)
Temperature

46.

(b)
Multipotent

47.

48.

(d)
Bartholin's glands

49.

(b)
parturition

50.

(a)
Bartholin's glands

51.

(a)
Dengue fever

52.

53.

54.

55.

(d)
Sea Anemone

56.

57.

(d)
Small pox

12th Standard Biology English Medium Important 1 Mark Creative Questions (New Syllabus) 2020

QB365 Student Learing Managemnet System

Std: 12th Standard - Biology

chapter: - Model Question paper

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

NEW MCQ Practice Test - Tamilnadu Stateboard Class 12

Biology Tamilnadu Stateboard Class 12 MCQ Practice Test

Tamilnadu Stateboard Class 12 MCQ Practice Test

12th Standard Study Materials