Biology Practice Test 2

Biology Practice Test 2 is designed to help students strengthen their understanding of key biological concepts, theories, and processes for competitive entry tests like MDCAT, NUMS, AKU, UET, ECAT, NTS, as well as FSC Board Exams. This test covers topics from molecular biology, cell division, human physiology, plant physiology, and more, helping students improve accuracy and retention.

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1 / 100

Category: Biology Ch 7 Class 11

Trypanosoma belongs to class:

NTS 2011
Biology
Kingdom Protista
Elimination Tool:

A) Sarcodina

B) Flagellata

C) Ciliata

D) Suctoria

2 / 100

Category: Biology

Phenylketonuria is

NUMS Mock 2
Biology
Chromosomes and DNA

A) Sex linked dominant trait

B) Sex linked recessive trait

C) Autosomal dominant trait

D) Autosomal recessive trait

3 / 100

Category: Biology Ch 4 Class 12

A major constituent of contraceptive pills is:

NUMS 2016
Biology
Reproduction
Elimination Tool:

A) Estrogen

B) Progesterone

C) Prolactin

D) Testosterone

4 / 100

Category: Biology Ch 6 Class 12

In semi-conservative replication

. Sequence of original duplex is conserved after one round of replication

Gererate DNA copies of entirely new molecules

Parental DNA become completely dispersed

Each strand of daughter molecules will be a mixture of old and new

5 / 100

Category: Biology Ch 8 Class 12

Erythroblastosis foetalis occurs when:

NTS 2011
Biology
Variation and Genetics
Elimination Tool:

D) Both mother and baby are Rh-positive

A) Mother is Rh-positive and baby is Rh-negative

B) Mother is Rh-negative and the baby is Rh-positive

C) Both mother and baby are Rh-negative

D) Both mother and baby are Rh-positive

6 / 100

Category: Biology Ch 3 Class 11

Which statement is incorrect about Lock and Key Model?

Specific enzyme can transform only a specific substrate

Active site of an enzyme is a non flexible structure.

Active site does not change before during or even after the reaction.

It explains the mechanism of every chemical reaction.

7 / 100

Category: Biology Ch 10 Class 12

The total aggregate of genes in a population at any one time is called population’s

Genome

Genomic library

Genetic group

Gene pool

8 / 100

Category: Biology Ch 2 Class 11

The number of calories required to raise the temperature of 1g of water from 15 to 16?C is called?

Specific Heat of Vaporization

Specific Heat capacity

Caloric Heat

Both A and C

9 / 100

Category: Biology Ch 14 Class 11

Fibrinogen is necessary for:

NUMS 2014
Biology
Transport
Elimination Tool:

A) Metabolism

B) Respiration

C) Reproduction

D) Clotting

10 / 100

Category: Biology Ch 7 Class 11

Which of the protozoa has a striking resemblance to collar cells in sponges?

Zooflagellates

Choanflagellates

Trypanosomoa

Trichonymphas

11 / 100

Category: Biology Ch 9 Class 12

It is a method for rapid production of a very large number of copies of a particular fragment of DNA:

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) Gel electrophoresis

B) Polymerase chain reaction

C) DNA extraction

D) Recombination

12 / 100

Category: Biology Ch 12 Class 11

Parasites capable of living independently of its host at times is called as _______ parasite.

Obligate

Strict

Facultative

Endoparasite

13 / 100

Category: Biology Ch 12 Class 11

_____ is activated to ______ by enterokinase / enteropeptidase enzyme secreted the lining of duodenum:

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Pepsinogen, pepsin

B) Trypsinogen, trypsin

C) Pepsinogen, trypsin

D) Chymotrypsinogen, chymotrypsin

14 / 100

Category: Biology Ch 4 Class 12

During birth, central nervous system of infants can be damaged by

PMC Sample 3
Biology
Reproduction
Elimination Tool:

A) syphilis

B) genital herpes

C) gonorrhoa

D) HPV

15 / 100

Category: Biology Ch 2 Class 12

Pivot joint exists between

NUMS 2014
Biology
Support and Movement
Elimination Tool:

A) Tibia and fibula

C) Humerus and scapula

B) Humerus and ulna

D) Ulna and radius

16 / 100

Category: Biology Ch 2 Class 12

Number of bones in the skull:

NUMS 2016
Biology
Support and Movement
Elimination Tool:

A) 22

B) 26

C) 24

D) 28

17 / 100

Category: Biology Ch 8 Class 11

The most common example of members of the kingdom fungi is/are:

NUMS 2019 Reconduct
Biology
Kingdom Fungi
Elimination Tool:

A) Star fish

B) Mushrooms

C) Algae

D) Human

18 / 100

Category: Biology Ch 5 Class 12

Typical symptoms like enlarged breasts and small testis in male are attributed to:

UHS 2015
Biology
Growth and Development
Elimination Tool:

A) Down’s Syndrome

B) Turner’s Syndrome

C) Klinefelter’s Syndrome

D) Phenylketonuria

19 / 100

Category: Biology

Q.34 What molecule would you not expect to find in a refrovirus

A. Adenine

B. Thymine

C. Uracil

D Guanine

20 / 100

Category: Biology Ch 9 Class 12

Which of the following is not necessary for PCR to occur?

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) dATP

B) Primers

C) DNA fragments

D) Ribonucleotides

21 / 100

Category: Biology Ch 13 Class 12

Hot substance is escaped from inside the earth in the form of

Volcanoes

Hot springs

Geysers

All of these

22 / 100

Category: Biology

Q.18 Which of these is not a reflex action?

A, Secretion of sweat

B. salivation

C. Flexion due to needle prick

D. blinking of eyes due to strong light

23 / 100

Category: Biology Ch 6 Class 11

The size of Spirochete is

0.1 -600 um

100-200 nm

500 um

0.75-1.25 um

24 / 100

Category: Biology Ch 3 Class 12

Which of the following is not secreted by thyroid gland?

NTS 2015 SMBBMC
Biology
Coordination and Control
Elimination Tool:

A) Thyroxin

B) Triiodothyronine

C) Calcitonin

D) Glucagon

25 / 100

Category: Biology Ch 6 Class 12

The length of okazaki fragments in eukayotes is

150–250 nucleotides long

200-300 nucleotides

1000-2000 nucleotde

100-200 nucleotides

26 / 100

Category: Biology Ch 6 Class 11

Select a method which causes the oxidation of chemical constituent of a bacterial cell:

PMC 2020
Biology
Kingdom Prokaryote
Elimination Tool:

A) Steam

B) Dry heat

C) Filtration

D) Radiation

27 / 100

Category: Biology Ch 2 Class 12

Epinasty is controlled by

Gibberellins

Abscisins

Auxins

Cytokinins

28 / 100

Category: Biology Ch 14 Class 11

The only vein in the human body carrying oxygenated blood is:

NUMS 2020
Biology
Transport
Elimination Tool:

A) Femoral

B) Pulmonary

C) Renal

D) Iliac

29 / 100

Category: Biology

Q.10 Which of the following bond is more resistant to temperature when protein gets denatured?

Peptide Bond

B. Disulphide bond

Ionic Interactions

D. Hydrophobic interactions

30 / 100

Category: Biology Ch 13 Class 11

Vocal cords are stretched across

Larynx

Pharynx

Golttis

None of these

31 / 100

Category: Biology Ch 13 Class 11

Nicotine in tobacco:

NUMS 2014
Biology
Gaseous Exchange
Elimination Tool:

A) Decreases the heart rate

B) Decreases the blood pressure

C) Block the transport or oxygen

D) Paralyzes cells

32 / 100

Category: Biology Ch 4 Class 12

All of the following are sexually transmitted diseases except:

NTS 2011
Biology
Reproduction
Elimination Tool:

A) Syphilis

B) Gonorrhea

C) Alzheimer's Disease

D) Genital Herpes

33 / 100

Category: Biology Ch 6 Class 11

Genetic recombination in bacteria can occur through:

NUMS 2015
Biology
Kingdom Prokaryote
Elimination Tool:

A) Conjugation

B) Transformation

C) Transduction

D) All of the above

34 / 100

Category: Biology Ch 13 Class 11

The structural and functional unit of the lungs is:

PMC Practice 2
Biology
Gaseous Exchange
Elimination Tool:

A) Alveoli

B) Trachea

C) Bronchiole

D) Bronchus

35 / 100

Category: Biology Ch 13 Class 12

In nitrogen fixation, nitrogen is converted to:

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Nitrate ions and ammonia

B) Atomic nitrogen

C) Urea

D) All of these

36 / 100

Category: Biology

In cross-section each Centriole consist of nine (each in triplets) of:

NUMS Mock 2
Biology
Cell Structure and Function

A) Microfilaments

B) Microvilli

C) Microtubules

D) Intermediate filaments

37 / 100

Category: Biology Ch 8 Class 12

How many genes control Rh blood group system?

One

Two

Three

Four

38 / 100

Category: Biology Ch 10 Class 12

Which one is NOT a continuous trait?

NUMS 2019 Reconduct
Biology
Evolution
Elimination Tool:

A) Human height

B) Tongue rolling

C) Wheat grain color

D) Human skin color

39 / 100

Category: Biology Ch 5 Class 12

Secondary growth is actually

Extension of plant body

Increase in thickness

Production of leaves and flowers

None of these A

40 / 100

Category: Biology Ch 11 Class 11

Many substances which are urgently required by the cell while cell absorbs them against the concentration gradient by utilizing energy in the form of:

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) ATP

B) Heat

C) GTP

D) Light

41 / 100

Category: Biology Ch 7 Class 11

Sleeping sickness in humans is caused by:

UHS 2013
Biology
Kingdom Protista
Elimination Tool:

A) Trypanosoma

B) Plasmodium

C) Anopheles

D) Andes

42 / 100

Category: Biology Ch 2 Class 11

Ptyalin can convert starch into:

NUMS 2015
Biology
Biological Molecules
Elimination Tool:

A) Monosaccharide form

B) Oligosaccharide form

C) Polysaccharide form

D) All given options

43 / 100

Category: Biology Ch 6 Class 12

A fern has _____ pairs of chromosomes.

NTS 2012
Biology
Chromosomes and DNA
Elimination Tool:

A) 23

B) 40

C) 500

D) 13

44 / 100

Category: Biology Ch 12 Class 11

The structure which prevents the entry of food particles into the respiratory passage is:

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Hard palate

B) Epiglottis

C) Soft palate

D) Larynx

45 / 100

Category: Biology Ch 6 Class 11

E. coli and example of entrobacteriace is important for causing diarrheal diseases its size is:

0.1-600 um

100-200 nm

1.1-1.5 um (width) 2.0-6.0 um (length)

0.75-1.25 um

46 / 100

Category: Biology Ch 10 Class 12

Which factor decides what type of variation should be flourished and passed on to the next generations?

NTS 2019
Biology
Evolution
Elimination Tool:

A) Species

B) Population

C) Survival

D) Environment

47 / 100

Category: Biology

Q.26 The function/s of HCl during digestion is/are:

A. Adjust the pH

B. Softens the food

C. Activate pepsinogen to pepsin

D. All A, B, C

48 / 100

Category: Biology Ch 2 Class 12

Which of the following plays the major role in providing support to young herbaceous parts of the plant:

Living cells of epidermis with higher turgor pressure.

Living cells of cortex and pith with higher turgor pressure.

Collenchyma cells

All of these

49 / 100

Category: Biology Ch 3 Class 11

The effect of competitive inhibitor on enzyme activity is such that it affects which of the following?

PMC Sample 2
Biology
Enzymes
Elimination Tool:

A) Increases enzyme activity

B) Doesn't change enzyme activity

C) Decreases enzyme activity

D) None of these options is correct

50 / 100

Category: Biology Ch 4 Class 12

Menstruation, the shedding of the lining of the uterus (endometrium), is accompanied by:

NUMS 2019 Cancelled
Biology
Reproduction
Elimination Tool:

A) Shivering

B) Fever

C) Bleeding

D) Vomiting

51 / 100

Category: Biology Ch 7 Class 11

Which of the following is used as a biological weapon?

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) Radiation

B) All of these

C) Chemicals

D) Virus

52 / 100

Category: Biology Ch 10 Class 12

A group of populations that have the potential to interbreed in nature is

Genus

Family

Species

Community

53 / 100

Category: Biology Ch 5 Class 12

Intercalary meristems are of

Permanent nature

Temporary nature

Some are permanent some temporary

None of these

54 / 100

Category: Biology Ch 2 Class 11

Which of the following are instant sources of energy in living organisms, like glucose? Their general formula is:

NUMS 2019 Cancelled
Biology
Biological Molecules
Elimination Tool:

A) Cx(H2O)y

B) C6H12O6

C) Cx(H2O)x

D) Cx(HO)y

55 / 100

Category: Biology

Q.28 The enzyme which plays important role in HIV pathogenesis

A. RNA polymerase I

B. DNA polymerase II

C. Reverse Transcriptase I

D. Reverse Transcriptase

56 / 100

Category: Biology Ch 6 Class 11

Some bacteria ranging occasionally a size of 500 ?m in length are

Escherichia coli

Spirochetes

Mycoplasma

Epulopiscuim

57 / 100

Category: Biology Ch 7 Class 11

Photosynthesis is absent in which of the following:

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) Bacteria

B) None of these

C) Seaweeds

D) Mushrooms

58 / 100

Category: Biology Ch 7 Class 11

Trypanosoma is a human parasite causing

UHS 2010
Biology
Kingdom Protista
Elimination Tool:

A) African sleeping sickness

B) European sleeping sickness

C) Indonesian sleeping sickness

D) American sleeping sickness

59 / 100

Category: Biology Ch 6 Class 12

In DNA A.

A forms two bonds with T

G forms three bonds with C

A forms three bonds with T

Both a and b

60 / 100

Category: Biology Ch 11 Class 11

Light reaction takes place on/in

Thylakoid

Storma

Chloroplast

Grana

61 / 100

Category: Biology Ch 9 Class 12

In the commercial manufacture of insulin, a human gene is inserted into which one of the following?

NTS 2013
Biology
Biotechnology
Elimination Tool:

A) A chromosome of a human cell

B) A protein molecule in a yeast cell

C) The DNA of a bacterium

D) The nucleic acid in a virus

62 / 100

Category: Biology

Q.53____________________are among smallest known virus

A. Picornavirus

B. Parvoviruses

C. Herpes virus

D. Rotavirus

63 / 100

Category: Biology Ch 10 Class 12

Archaebacteria can survive at

150?C

300?C

120?C

200?C

64 / 100

Category: Biology Ch 3 Class 11

Some enzymes require the presence of a non protein molecule to behave catalytically. An enzyme devoid of this molecule is called a(n):

NTS 2013
Biology
Enzymes
Elimination Tool:

A) Holoenzyme

B) Apoenzyme

C) Coenzyme

D) Zymoenzyme

65 / 100

Category: Biology

Q.16 Retroviruses have a special enzyme ‘reverse transcriptase’ which can convert ____________into ___________.

A. DNA to DNA

B. RNA to DNA

C. DNA to RNA

D. RNA to RNA

66 / 100

Category: Biology Ch 8 Class 11

Fungi can tolerate pH from

3?7

2?6

2?9

. 3?6

67 / 100

Category: Biology Ch 11 Class 12

Lichen and algae form

Climax community

Pioneers community

Initiator community

Seral community

68 / 100

Category: Biology Ch 4 Class 11

A group of ribosomes attached to mRNA is known as

Polymer

Polypeptide

Polysomes

Monomer

69 / 100

Category: Biology Ch 6 Class 11

Which of the following structure primarily helps in attachment of bacteria on various surfaces?

Flagella

Pili

Both of these

None of these

70 / 100

Category: Biology Ch 7 Class 12

The term bivalent means:

NUMS 2014
Biology
Cell Cycle
Elimination Tool:

A) Two chromatids

B) Two chromosomes

C) Four chromatids

D) Four chromosomes

71 / 100

Category: Biology

Q3 Assymetrical body is a feature of phylum

A. Annelida

B. Arthropoda

C. Porifera

D. Cnidaria

72 / 100

Category: Biology Ch 6 Class 11

Which of the following organelles are present in all the bacteria?

NTS 2014
Biology
Kingdom Prokaryote
Elimination Tool:

A) Mesosome

B) Golgi bodies

C) Mitochondria

D) Chloroplast

73 / 100

Category: Biology

Hemoglobin carries more oxygen than plasma by:

NUMS Mock 1
Biology
Gaseous Exchange

A) 50 times

B) 20 times

C) 70 times

D) 100 times

74 / 100

Category: Biology

Which of the following, which is the incorrectly paired one?

NUMS Mock 2
Biology
Biology and its Major Fields of Specialization

B) Schlelden and schwann … cell theory

C) Robert Brown… nucleus

D) Watson and Crick … DNA model

E) Virchow… mosaic model of plasma membrane

75 / 100

Category: Biology Ch 9 Class 12

DNA made by joining pieces from two or more different sources:

UHS 2018
Biology
Biotechnology
Elimination Tool:

A) Probes

B) Restriction endonuclease

C) Mutated DNA

D) Recombinant DNA

76 / 100

Category: Biology Ch 10 Class 12

Most fossils are found in the

Metamorphic rocks

Soil

Sedimentary rocks

Volcanic mountains

77 / 100

Category: Biology Ch 13 Class 11

During inspiration, the space inside the chest cavity is increased due to:

UHS 2019
Biology
Gaseous Exchange
Elimination Tool:

A) The relaxation of the muscles of the diaphragm

B) Relaxation of the external intercostal muscles

D) The contraction of the muscles of the diaphragm

C) Increased pressure

78 / 100

Category: Biology

Lecithin is formed by combining phosphatidic acid with ______:

NUMS Mock 1
Biology
Biological Molecules

A) Serine

B) Choline

C) Inositol

D) Ethanolamine

79 / 100

Category: Biology Ch 8 Class 12

If we cross round yellow seeded plant with green wrinkled seeded plants, what will be phenotypic ratio at F2 generation?

NUMS 2019 Cancelled
Biology
Variation and Genetics
Elimination Tool:

A) 9:3:3:1

B) 9:4:3:2

C) 3:9:3:1

D) 8:3:3:2

80 / 100

Category: Biology Ch 11 Class 11

The oxidation of PGAL during glycolysis yields ____ molecules.

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) ATP

B) FAD

C) FADH

D) ADP

81 / 100

Category: Biology Ch 10 Class 11

The only aquatic arthropods:

PMC Sample 1
Biology
Kingdom Animalia
Elimination Tool:

A) Crustaceans

B) Arachnids

C) Myriapods

D) Gastopods

82 / 100

Category: Biology Ch 6 Class 11

A type of bacterial cell that is completely surrounded by flagella is called:

PMC Practice 5
Biology
Kingdom Prokaryote
Elimination Tool:

A) Diplococcus

B) Tetrad

C) Peritrichous

D) Munotrichous

83 / 100

Category: Biology Ch 5 Class 11

The virus can only survive and reproduce inside a:

NTS 2019
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Animal Cell

B) Bacterial cell

C) Living cell

D) Non-living cell

84 / 100

Category: Biology Ch 4 Class 12

Referring to sexual reproduction, humans are:

NTS 2018
Biology
Reproduction
Elimination Tool:

A) Hermaphrodites

B) Vivaparous

C) Oviparous

D) Self-fertilized

85 / 100

Category: Biology Ch 4 Class 11

Lysosomes function in:

NTS 2011
Biology
Cell Structure and Function
Elimination Tool:

A) Protein synthesis

B) Processing

C) Intracellular digestion

D) Lipid synthesis

86 / 100

Category: Biology Ch 4 Class 11

The second most abundant bio element in the human body is:

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Oxygen

B) Carbon

C) Hydrogen

D) Nitrogen

87 / 100

Category: Biology

The secondary and tertiary consumers are also known as:

NUMS Mock 1
Biology
Ecosystem

B) Herbivores

C) Abiotic factors

D) Decomposers

E) Carnivores

88 / 100

Category: Biology

Q.11 In cocci, three plane division result in formation of sarcine which is a

A. Cuba of 8 cocci

B. Square of 4 cocci

C. Irregular structure

D. Triangular 6 cocci

89 / 100

Category: Biology Ch 6 Class 12

Phenotype is:

PMC 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) The genetic component i.e. the genes in an individual for a particular trait

B) Partner of gene pair

C) The form of appearance of a trait

D) The position of a gene on the chromosome

90 / 100

Category: Biology

Choose the term from the following which is NOT a part of gene therapy?

NUMS Mock 2
Biology
Biotechnology

A) Bone marrow transplant

B) Retrovirus

C) DNA Fingerprinting

D) Somatic cells

91 / 100

Category: Biology

Q.46 Which part of the brain connects the cerebrum with the spinal cord?

A. Forebrain

B. Cerebrum

C. Cerebellum

D. Brainstem

92 / 100

Category: Biology Ch 5 Class 11

The social organization of howling monkeys was studied by:

NUMS 2014
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Allen

B) Thorpe

C) Schjeldeup ebbe

D) Carpenter

93 / 100

Category: Biology Ch 8 Class 12

The gene which controls ABO group has how many alleles in an individual

One

Two

Three

Four

94 / 100

Category: Biology Ch 6 Class 12

Which statement is correct?

Leading strand elongates away from the replication fork

Lagging strand elongates towards the replication fork

Lagging strand is constructed discontinuously.

Both a and b

95 / 100

Category: Biology Ch 6 Class 11

Germ theory of disease has ______ postulates

96 / 100

Category: Biology Ch 10 Class 12

Carolus Linnaeus was believer of which of the following?

PMC Sample 1
Biology
Evolution
Elimination Tool:

A) special creation

B) natural selection

C) catastrophism

D) Inheritance of acquired characters

97 / 100

Category: Biology Ch 3 Class 12

The estrogen hormone secretion during the oogenesis is stimulated by:

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) LH hormone

B) Inhibition hormone

C) FSH hormone

D) Testosterone hormone

98 / 100

Category: Biology Ch 7 Class 11

Plasmodium belongs to

Ciliates

Apicomplexans

Actinopods

Foraminferans

99 / 100

Category: Biology Ch 3 Class 11

An activated enzyme made of polypeptide chain and a cofactor is?

PMC Practice 2
Biology
Enzymes
Elimination Tool:

A) Substrate

B) Coenzyme

C) Apoenzyme

D) Holoenzyme

100 / 100

Category: Biology Ch 9 Class 12

A weed engineered to produce a biodegradable plastic in cell granules is

. Mouse-cat cress

Mouse weed

Mouse-eared cress

None of these

Your score is

The average score is 57%

Structured Practice for Best Entry Test Preparation

This topic-wise and chapter-wise practice test allows students to focus on individual biology concepts, including diagrams, processes, and conceptual questions. Regular practice enhances understanding, sharpens problem-solving skills, and builds confidence to tackle both board and competitive exam questions efficiently.

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