Biology Practice Test 4

Biology Practice Test 4 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 human anatomy, physiology, microbiology, and ecology, helping students improve accuracy and retention.

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1 / 100

Category: Biology Ch 9 Class 12

Chimaeric DNA is also known as

Recombinant DNA

Complementary DNA

Vector

Plasmid

2 / 100

Category: Biology Ch 14 Class 11

The causes of Cyanosis include:

NTS 2010
Biology
Transport
Elimination Tool:

A) Deficiency of vitamin C

B) Varicella-zoster virus

C) Degeneration of the cartilage of joints

D) Ventricular septum defect

3 / 100

Category: Biology Ch 8 Class 12

Which of the following does not belong to the same linkage group?

NUMS 2015
Biology
Variation and Genetics
Elimination Tool:

A) Sickle cell anemia

B) Albinism

C) Leukemia

D) Gout

4 / 100

Category: Biology Ch 4 Class 11

A group of cells performing same function are known as:

NUMS 2016
Biology
Cell Structure and Function
Elimination Tool:

A) Organelles

B) Tissues

C) A system

D) Both A and B

5 / 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

6 / 100

Category: Biology Ch 6 Class 11

Who discovered the bacteria causing tuberculosis and also developed various techniques of media preparation and maintenance of pure culture?

Robert Koch

Louis Pasteur

Alexander Fleming

Leeuwenhoek

7 / 100

Category: Biology

An enzyme that helps in the conversion of RNA to DNA is called:

NUMS Mock 3
Biology
Chromosomes and DNA

A) Transcriptase

B) Polymerase

C) Reverse transcriptase

D) Synthetase

8 / 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

9 / 100

Category: Biology Ch 11 Class 11

FADH2 is produced during which step of Krebs cycle?

NUMS 2015
Biology
Bioenergetics
Elimination Tool:

A) When Isocitrate is converted into alpha – ketoglutarate

B) When alpha – Ketogluterate is converted into Succinate

C) When Succinate is converted into Fumarate

D) When Fumarate is converted into Maltose

10 / 100

Category: Biology

Q.35 Ribose is a monosaccharide constituent of man

A. Enzymes

B. Coenzymes

C. Vitamin

D. Antibiotics

11 / 100

Category: Biology Ch 13 Class 11

Which of the following is the respiratory surface in human beings?

PMC Practice 3
Biology
Gaseous Exchange
Elimination Tool:

A) Lungs

B) Alveoli

D) Alveolar duct

C) Windpipe

12 / 100

Category: Biology

Q.36 The ETC in plants consists of an electron carrier called?

A. Pq

B. Pc

C. Pt

D.Po

13 / 100

Category: Biology Ch 10 Class 11

Which one of the following does not have intermediate host?

NUMS 2016
Biology
Kingdom Animalia
Elimination Tool:

A) Tapeworm

C) Liver fluke

B) Ascaris

D) Plasmodium

14 / 100

Category: Biology

Q.57 Electron transport chain pumps protons across the membrane from __________ to ____________.

A. Thylakoid space, stroma

B. Inter-membrane space, stroma

C. Stroma, inter-membrane space

D. Stroma, thylakoid space

15 / 100

Category: Biology Ch 9 Class 12

A single gene can be amplified by using:

NUMS 2019 Reconduct
Biology
Biotechnology
Elimination Tool:

A) DNA fingerprinting

B) Polymerase Chain Reaction

C) Gel Electrophoresis

D) Recombinant DNA technology

16 / 100

Category: Biology Ch 6 Class 11

The process of recombination in prokaryotes takes place in which of the following ways?

PMC Sample 2
Biology
Kingdom Prokaryote
Elimination Tool:

A) transformation

B) conjugation

C) transduction

D) all of these

17 / 100

Category: Biology Ch 9 Class 11

Antherozoids the male gamete in bryophytes are attracted towards Archegonium i.e. female sex organ by

Phototactic phenomenon

Chemotactic phenomenon

. Geotropic phenomenon

Chemotropic movement

18 / 100

Category: Biology

Q.36 Parkinson’s disease is caused by cell death, which produces ____________.

A. Acetylcholine

B. Serotonin

C. Dopamine

D. Adrenaline

19 / 100

Category: Biology

Q.30 This group of animals has three bones in the ear.

A. Reptiles

B. Mammals

C. Both reptiles and mammals

D. Birds and mammals

20 / 100

Category: Biology Ch 10 Class 12

The following observations refer to evolution:

I. Inherited variations which are ‘favoured’ in particular environments are passed on.

II. There is a struggle for existence.

III. In time, ‘favoured’ inherited variations may accumulate causing gradual changes in the organism.

IV. Although populations tend to overproduce, they remain more or less constant in numbers from generation to generation.

In what sequence should the statements be placed to support Darwin’s theory of evolution?

NTS 2014
Biology
Evolution
Elimination Tool:

A) I, II, III, IV

B) II, I, III, IV

C) III, I, IV, II

E) IV, II, I, III

21 / 100

Category: Biology Ch 6 Class 12

In a typical nucleotide, the nitrogenous base is attached to _______ carbon of pentose sugar.

NTS 2010
Biology
Chromosomes and DNA
Elimination Tool:

B) 5th

C) 4th

D) 3rd

E) 1st

22 / 100

Category: Biology

Q.12 In enzymatic mechanism, the substrate bind to enzyme active site to produce?

A. Reactants

B. Enzyme

C. Products

D. all of these

23 / 100

Category: Biology Ch 8 Class 11

Which of the following component is found in the cell wall of fungi?

UHS 2012
Biology
Kingdom Fungi
Elimination Tool:

A) Cellulose

B) Chitin

C) Proteins

D) Glycerol

24 / 100

Category: Biology Ch 3 Class 11

The enzyme in breast milk that causes the coagulation of milk or forms precipitates of milk is:

NUMS 2016
Biology
Enzymes
Elimination Tool:

A) Renin

B) Trypsin

C) Amylase

D) Lipase

25 / 100

Category: Biology Ch 6 Class 12

Which of the following enzymes is used to join DNA fragments?

NTS 2016 DUHS & JSMU
Biology
Chromosomes and DNA
Elimination Tool:

A) DNA polymerase

B) Ligase

C) Primase

D) Endonuclease

26 / 100

Category: Biology

_________ is the exact position of a gene on the chromosome.

NUMS Mock 3
Biology
Chromosomes and DNA

A) Trait

B) Centromere

C) Genotype

D) Locus

27 / 100

Category: Biology Ch 13 Class 11

Oxygen contents per liter of air is

10 ml

100 ml

200 ml

100ml

28 / 100

Category: Biology

Q.59 NADH produced during glycolysis and Krebs cycle will oxidized by:

A. Coenzyme ‘Q’

B. Cytochrome ‘c’

C. Cytochrome ‘b’

D. Cytochrome ‘a’

29 / 100

Category: Biology Ch 12 Class 12

End of earth’ is related to

Tropical rain forest

Temperate deciduous forest

Savanna

Tundra

30 / 100

Category: Biology Ch 2 Class 11

The helical structure of a protein is kept by the formation of hydrogen bond between amino acid molecules which are:

NUMS 2015
Biology
Biological Molecules
Elimination Tool:

A) Adjacent to each other

B) In successive spiral turns

C) Between two different polypeptide chains

D) None of the given options

31 / 100

Category: Biology Ch 12 Class 11

A hormone called _______ controls the secretion of gastric juice.

NUMS 2018
Biology
Nutrition
Elimination Tool:

A) Gastrin

B) Secretin

C) Thyroxine

D) Iodothyronine

32 / 100

Category: Biology

Among the following, which cellular organelle contains circular DNA, similar to those found in bacteria?

NUMS Mock 1
Biology
Cell Structure and Function

A) Lysosome

B) Nucleus

C) Nucleosome

D) Mitochondria

33 / 100

Category: Biology

Q.47 Which of the following are believed to have common origin with annelids?

A. Nematodes

B. Arthropods

C. Molluses

D. None of these

34 / 100

Category: Biology Ch 1 Class 12

Humans are:

NUMS 2016
Biology
Homeostasis
Elimination Tool:

A) Ammonotelic

B) Ureotelic

C) Uricotelic

D) None of these

35 / 100

Category: Biology Ch 4 Class 11

Lysosomes are also called:

NTS 2012
Biology
Cell Structure and Function
Elimination Tool:

A) Suicide Sacs

B) Chondriosome

C) Storage organelle

D) Dicytosome

36 / 100

Category: Biology Ch 13 Class 11

The blood enters the _____ side of heart

Posterior

Lateral

All possibl

37 / 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

38 / 100

Category: Biology

The RNA found in Ribosomes is:

NUMS Mock 1
Biology
Chromosomes and DNA

A) mRNA

B) rRNA

C) tRNA

D) Polysome

39 / 100

Category: Biology Ch 12 Class 12

In which zone plant community is most diverse

Limnetic zone

Littoral zon

Profundal zone

All of these

40 / 100

Category: Biology Ch 5 Class 11

Second major form of hepatitis is:

NUMS 2015
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Hepatitis A

B) Hepatitis B

C) Hepatitis C

D) Hepatitis D

41 / 100

Category: Biology Ch 6 Class 12

Mutations can occur in:

NUMS 2016
Biology
Chromosomes and DNA
Elimination Tool:

A) DNA

B) Protein

C) RNA

D) A and C

42 / 100

Category: Biology

The best function of coelom is described as ____.

NUMS Mock 1
Biology
Kingdom Animalia

A) To increase the size of the animals

B) To help in the functioning of reproductive system

C) To provide space for the development of organs and systems

D) All of these options are correct

43 / 100

Category: Biology

Q.17 Final acceptor of electrons in respiratory chain is?

A. NADH

B. Cytochrome a3

C. Water

D. Oxygen

44 / 100

Category: Biology Ch 5 Class 11

There are 3 stages of HIV infection, which sequence is correct

PMC Sample 1
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) AIDS, Chronic HIV, Acute HIV

B) Chronic HIV, AIDS, Acute HIV

C) Acute HIV, Chronic HIV, AIDS

D) all of them

45 / 100

Category: Biology Ch 2 Class 12

Roots of a plant show

Positive phototropism and negative geotropism.

Negative phototropism and positive geotropism.

Negative tactic movement and positive tropic movement.

Positive geotropism of stem and roots

46 / 100

Category: Biology Ch 6 Class 11

The DNA of the bacterium is present in a distinct region called:

NUMS 2017
Biology
Kingdom Prokaryote
Elimination Tool:

A) Nucleolus

B) Centrosome

C) Nucleoid

D) Nucleus

47 / 100

Category: Biology Ch 1 Class 12

Excretory system, consisting of protonephridia tubes, are present in phylum:

NUMS 2020
Biology
Homeostasis
Elimination Tool:

A) Porifera

B) Annelida

C) Platyhelminthes

D) Cnidaria

48 / 100

Category: Biology Ch 5 Class 12

Intercalary meristems are of

Permanent nature

Temporary nature

Some are permanent some temporary

None of these

49 / 100

Category: Biology Ch 13 Class 11

Water is _____ times viscous than air

1000

5000

8000

50 / 100

Category: Biology Ch 11 Class 11

C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents:

Photosynthesis

Aerobic respiration

Anaerobic respiration

Respiration

51 / 100

Category: Biology Ch 11 Class 12

Abiotic components include

Atmosphere

Hydrosphere

Lithosphere

All of these

52 / 100

Category: Biology Ch 8 Class 11

Fungi can tolerate pH from

3?7

2?6

2?9

. 3?6

53 / 100

Category: Biology Ch 12 Class 11

Which type of mucosa cells secrete pepsinogen?

NUMS 2014
Biology
Nutrition
Elimination Tool:

A) Zymogen

B) Oxyntic

C) Mucous

D) Gastric

54 / 100

Category: Biology Ch 10 Class 12

At what point are two populations descending from the same ancestral stock considered separate species?

NTS 2014
Biology
Evolution
Elimination Tool:

A) When they can no longer produce viable, fertile offspring

B) When they look significantly different from each other

C) When they can interbreed successfully and produce offspring

D) When their habitats are separated by a significantly large distance so that they cannot meet

55 / 100

Category: Biology Ch 9 Class 12

Which one of the following is made up of radioactively labelled nucleotides?

UHS 2015
Biology
Biotechnology
Elimination Tool:

A) Phage DNA

B) Genomic Library

C) Recombinant DNA

D) Gene Probe

56 / 100

Category: Biology

The system responsible for fighting the pathogens is:

NUMS Mock 4
Biology
Transport

A) Muscular System

B) Endocrine System

C) Nervous System

D) Immune System

57 / 100

Category: Biology Ch 6 Class 11

Which of the following bacteria are without a cell wall?

NUMS 2016
Biology
Kingdom Prokaryote
Elimination Tool:

A) Mycoplasma

B) Gram positive bacteria

C) Gram negative bacteria

D) Archaeo bacteria

58 / 100

Category: Biology Ch 1 Class 12

Most of the marine invertebrates are

Osmoconformers

Osmoregulators

Both depend upon the concentration of sea water

None of these

59 / 100

Category: Biology

Which of the following bones are present in the palm of the hand:

NUMS Mock 3
Biology
Support and Movement

A) Carpals

B) Metacarpals

C) Phalanges

D) Tarsal

60 / 100

Category: Biology Ch 2 Class 12

Exoskeleton of a marine snail is composed of

CaPO4

CaCO3

CaSO4

SiO2

61 / 100

Category: Biology Ch 12 Class 12

Weather refers to

Short-term fluctuations in temperature, cloud cover, wind and precipitation

It prevails over periods of hrs or days

Overall patterns of weather that prevail from year to year

. Both a and b

62 / 100

Category: Biology

The table shows the characteristics of the blood in one blood vessel in the body.

Which blood vessel contains blood with these characteristics?

NUMS Mock 1
Biology
Transport

A) Aorta

B) Pulmonary artery

C) Pulmonary vein

D) Vena cava

63 / 100

Category: Biology Ch 2 Class 12

Hinge joint occurs in:

NTS 2015 SMBBMC
Biology
Support and Movement
Elimination Tool:

A) Elbow

B) Skull

C) Ankle

D) Backbone

64 / 100

Category: Biology Ch 7 Class 11

Most of the photosynthesis on earth is carried by

Kelps

Gymnosperms

Angiosperms

Algae

65 / 100

Category: Biology

Photosystems are located in _

A. Stroma

B. Chloroplast envelope

C. Thylakoid membranes

D. The intergrana

66 / 100

Category: Biology Ch 11 Class 12

Wood forests form the

Pioneers community

Climax community

Top community

Transient community

67 / 100

Category: Biology Ch 6 Class 12

Which is incorrect?

Chromosomes 1st observed by walther Fleming

Chromosomal theory of inheritance 1st formulated by Walter Sutton

1st evidence of hereditary nature of DNA provided by Friedrich Meischer

. Sex chromosomes discovered by Thomas Hunt Morgan

68 / 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

69 / 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

70 / 100

Category: Biology Ch 3 Class 12

A _____ is a junction between two neurons or between a motor neuron and a muscle cell:

PMC 2020
Biology
Coordination and Control
Elimination Tool:

A) Impulse

B) Synapse

C) Axon

D) Cleft

71 / 100

Category: Biology

Q.6 All of the following are the functions of endoplasmic reticulum except:

A. Nerve impulse conduction

B. Transport of material

C. Mechanical support

D. Synthesis of conjugated molecules

72 / 100

Category: Biology Ch 4 Class 11

A group of ribosomes attached to mRNA is known as

Polymer

Polypeptide

Polysomes

Monomer

73 / 100

Category: Biology Ch 9 Class 11

Which one of the following types of cell are found in secondary xylem of angiosperms?

NTS 2015 DUHS and JSMU
Biology
Kingdom Plantae
Elimination Tool:

A) Tracheids parenchyma fibres collenchyma but no vessels

B) Vessels tracheids parenchyma collenchyma but no fibres

C) Vessels tracheids fibres collenchyma but no parenchyma

D) Vessels tracheids fibres parenchyma but no collenchyma

74 / 100

Category: Biology Ch 9 Class 11

What is the name of the structure of the leaf that attaches the leaf to the stem?

PMC Sample 2
Biology
Kingdom Plantae
Elimination Tool:

A) Phloem

B) Mesophyll

C) Xylem

D) Petiole

75 / 100

Category: Biology Ch 9 Class 12

Human genome is ______ times larger than any other genome sequenced so far

76 / 100

Category: Biology Ch 2 Class 11

Which of the following basic structural level of proteins is indicated by an association of two alpha and two beta chains in the haemoglobin molecule?

NTS 2018
Biology
Biological Molecules
Elimination Tool:

A) Primary structure

C) Tertiary structure

B) Secondary structure

D) Quatenary Structure

77 / 100

Category: Biology Ch 13 Class 11

Which of the following correctly explains the structure of myoglobin:

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) 4 polypeptide chains + 4 heme portions

B) 4 polypeptide chains + 1 heme portions

C) 1 polypeptide chains + 4 heme portions

D) 1 polypeptide chains + 1 heme portions

78 / 100

Category: Biology Ch 4 Class 12

Luteinizing hormone, which is produced by the pituitary gland, promotes ovulation and stimulate the ovaries to produce:

NUMS 2019 Cancelled
Biology
Reproduction
Elimination Tool:

A) Estrogen

B) Estrogen and progesterone

C) Progesterone

D) Oxytocin

79 / 100

Category: Biology

Which of the following is correct in case of active membrane potential?

NUMS Mock 2
Biology

A) Extra cellular sodium is high

B) Extra cellular potassium is high

C) Intracellular sodium is high

D) Intracellular potassium is less

80 / 100

Category: Biology Ch 3 Class 12

Maintenance of normal resting potential via movement of K+ inside the cell and na+ out is a/an _______ process.

Active

Passive

Diffusional

None of these.

81 / 100

Category: Biology Ch 13 Class 12

Study of environmental relations is called:

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Physiology

B) Pulmonology

C) Morphology

D) Ecology

82 / 100

Category: Biology Ch 4 Class 11

Which of the following statement(s) is/are correct regarding a nucleus?

I.Stores wastes and other Substances

II.Contains genetic material

III.Helps in cellular transport system

IV.Control centre of the cell

NTS 2017
Biology
Cell Structure and Function
Elimination Tool:

A) I only

B) I&II

C) II & III

D) II & IV

83 / 100

Category: Biology Ch 10 Class 12

The process that has transformed life on earth from its earliest forms to vast diversity is

Mutation

Evolution

Migration

Genetic drift

84 / 100

Category: Biology Ch 4 Class 12

What is critical in photoperiodism?

Length of light period

Length of dark period

Both a and b

None of these

85 / 100

Category: Biology Ch 13 Class 12

The actual or preserved remains of the organisms that lived in the ancient past are called:

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Fossils

B) Impression

C) Ancient prints

D) Ancient cast

86 / 100

Category: Biology Ch 13 Class 12

The animals that feed on organic debris from decomposing plants and animals are called:

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Herbivores

B) Carnivores

C) Omnivores

D) Detritivores

87 / 100

Category: Biology Ch 6 Class 11

Germ theory was presented by:

NUMS 2016
Biology
Kingdom Prokaryote
Elimination Tool:

A) Robert Koch

B) Antonie van Leeuwenhoek

C) Robert Hooke

D) Robert Brown

88 / 100

Category: Biology Ch 1 Class 12

Which hormone prepares the body for situations of stress and emergency?

NUMS 2014
Biology
Homeostasis
Elimination Tool:

A) Adrenaline

B) Non adrenaline

C) Thyroxin

D) Insulin

89 / 100

Category: Biology Ch 9 Class 11

Antheridia and archegonia are _____ organs in bryophytes.

NTS 2015 DUHS and JSMU
Biology
Kingdom Plantae
Elimination Tool:

A) Reproductive

B) digestive

C) respiratory

D) none of the above

90 / 100

Category: Biology Ch 12 Class 12

Productivity of an ecosystem is indicated by

Number of plants in that ecosystem

The density of that ecosystem

Consumption of carbon dioxide and evolve of oxygen

Both a and b

91 / 100

Category: Biology Ch 6 Class 12

The combination of XXY (47) chromosomes results in:

NTS 2012
Biology
Chromosomes and DNA
Elimination Tool:

A) Down's Syndrome

B) Turner's Syndrome

C) Klinefelter's Syndrome

D) Sickle cell anemia

92 / 100

Category: Biology

Q31 What happens during muscle contraction to the length of each myosin and actin filament?

A. A band becomes short

B. I band elongates

C. There is no change in sarcomere

D. Z- lines get closer

93 / 100

Category: Biology Ch 2 Class 12

Dermal and denticle scales of fishes are called:

NUMS 2015
Biology
Support and Movement
Elimination Tool:

A) Placoid scales

B) Ganoid scales

C) Ctenoid scales

D) Cycloid scales

94 / 100

Category: Biology Ch 4 Class 12

Female rabbits are:

NUMS 2014
Biology
Reproduction
Elimination Tool:

A) induced ovulators

B) spontaneous ovulators

C) seasonal ovulators

D) indifferent ovulators

95 / 100

Category: Biology Ch 13 Class 11

The irritant substances of smoke cause smoker’s cough which weakened and bursts:

NUMS 2019 Reconduct
Biology
Gaseous Exchange
Elimination Tool:

A) Bronchi

B) Bronchiole

C) Alveoli

D) Trachea

96 / 100

Category: Biology Ch 13 Class 11

Xerophytes have small thick leaves to;

UHS 2019
Biology
Gaseous Exchange
Elimination Tool:

A) Help them float on water

B) Limit water loss, by increasing the surface area

C) Help them survive in salty environment

D) Limit water loss, by reducing the surface area

97 / 100

Category: Biology Ch 3 Class 11

The active site of an enzyme:

Never changes

Forms no chemical bond with substrate

Determined by structure and the specificity of the enzyme.

They are non specific in their action.

98 / 100

Category: Biology Ch 13 Class 11

The gas-exchange portion of the human respiratory system is the:

NTS 2016 SMBBMC
Biology
Gaseous Exchange
Elimination Tool:

A) Larynx

B) Trachea

C) Bronchi

D) Alveoli

99 / 100

Category: Biology

Which one of the following is most likely to occur in a boy during puberty?

NUMS Mock 4
Biology
Reproduction

A) He produces eggs

B) His shoulders broaden

C) The colour of his eyes change

D) None of these options is correct

100 / 100

Category: Biology Ch 10 Class 12

Which of the following scientists contributed a lot to “modern synthetic theory of organic evolution:

NUMS 2014
Biology
Evolution
Elimination Tool:

A) Theodosius Dobzhansky 1937

B) Fischer 1958

C) Wright 1968

D) All of above

Your score is

The average score is 61%

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