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 11 Class 11

In the Krebs cycle, substrate-level phosphorylation accompanies the formation of:

NTS 2013
Biology
Bioenergetics
Elimination Tool:

A) Citrate

B) Alpha-ketoglutarate

C) Succinate

D) Fumarate

2 / 100

Category: Biology

Which of the following compounds possesses a single covalent bond between carbon and hydrogen?

NUMS Mock 4
Chemistry
Hydrocarbons

A) CH4

B) C2H2

C) C2H4

D) All of the above

3 / 100

Category: Biology Ch 10 Class 11

The simplest form in Kingdom Animalia belongs to:

NUMS 2018
Biology
Kingdom Animalia
Elimination Tool:

A) Eumetazoa

B) Bilateria

C) Protozoa

D) Parazoa

4 / 100

Category: Biology Ch 8 Class 11

Unicellular fungi which is non-hyphal is

Mushroom

Yeast

Penicillium

Mold

5 / 100

Category: Biology Ch 7 Class 12

Which of the following statements concerning nucleolus is correct?

NTS 2014
Biology
Cell Cycle
Elimination Tool:

A) It disappears at the time of cell division

B) There is only one nucleolus in every cell

C) It plays important role in the synthesis of ribonucleic acid and ribosomes in prokaryotic cells

D) It helps in destroying worn-out organelles

6 / 100

Category: Biology

Q.20 Cytochromes are electron transport intermediates containing?

A. myoglobin

B. heam

C. globulin

D. fibrin

7 / 100

Category: Biology Ch 2 Class 11

Carbon atom is

Monovalent

Divalent

Trivalent

8 / 100

Category: Biology Ch 5 Class 11

Kingdom Protoctista includes:

Prokaryotic organisms

Unicellular organisms

Fungi

Eu-cariotiquic organisms

9 / 100

Category: Biology Ch 8 Class 11

Root like structure in saprotrophic fungi are called

Rhizodis

Haustoria

Hyphae

Constricting rings

10 / 100

Category: Biology Ch 7 Class 12

Meiosis occurs at the time of

Gamete formation in animals

Spore formattion in plants

Growth in animals

Both a and b

11 / 100

Category: Biology Ch 6 Class 12

Genetic information in the DNA is encoded as:

NTS 2018
Biology
Chromosomes and DNA
Elimination Tool:

A) Deoxyribose sugar

B) Ribose sugar

C) Phosphate group

D) Sequence of nitrogenous bases

12 / 100

Category: Biology

Q.58 The enzymes required for the breakdown of glucose into pyruvate is present in:

A. Cytosol

B. Plastids

C. Mitochondria

D. Lumen of ER

13 / 100

Category: Biology Ch 5 Class 12

Human embryo remains enclosed in:

PMC Practice 1
Biology
Growth and Development
Elimination Tool:

A) Amniotic sac

B) Placenta

C) Chorion

D) Allantois

14 / 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

15 / 100

Category: Biology Ch 1 Class 12

Among the followings which is the most longest supportive cell?

Tracheids

Sclereids

Trachea

Collenchyma cells

16 / 100

Category: Biology Ch 7 Class 12

Crossing over is an exchange of genes between _______ resulting in a mixture of parental characteristics in offspring.

NTS 2019
Biology
Cell Cycle
Elimination Tool:

A) Sister Chromatids

B) Non-homologous Chromosomes

C) Sex chromosomes

D) Homologous chromosomes

17 / 100

Category: Biology Ch 4 Class 12

Amniocentesis is performed between the:

NTS 2011
Biology
Reproduction
Elimination Tool:

A) 16th and 18th week of gestation

B) 1st and 2nd week of gestation

C) 30th and 32nd week of gestation

D) 37th and 38th week of gestation

18 / 100

Category: Biology

Q.34 If the non-protien part is loosely attached to the protein part in the enzyme, it is known as

A. coenzyme

B. prosthetic group

C. cofactor

D. apoenzyme

19 / 100

Category: Biology

Q.28 The vocal cords are stretched across:

A. Larynx

B. Glottis

C. Pharynx

D. Trachea

20 / 100

Category: Biology Ch 10 Class 12

The actual remains or traces of organisms that lived in ancident geological times

Vestigial remains

Fossils

Fuel

None of these

21 / 100

Category: Biology

The region of the chromosome or, more specifically, the length of the DNA molecule, which has a particular function is called _______.

NUMS Mock 2
Biology
Chromosomes and DNA

A) Kinetochore

B) Locus

C) Allele

D) Gene

22 / 100

Category: Biology Ch 9 Class 11

The first cell of the sporophyte generation is

Oospore

Spore mother cel

Spore

Gamete

23 / 100

Category: Biology Ch 8 Class 11

Fungi can tolerate pH from

3?7

2?6

2?9

. 3?6

24 / 100

Category: Biology Ch 1 Class 12

In plants which of the following is a waste product produced both during photosynthesis and respiration

CO2

H2O

Both A and B

25 / 100

Category: Biology Ch 6 Class 12

Central dogma is

Transfer of information from DNA to mRNA

Basic mechanism of reading and expressing genes

Transfer of information from RNA to proteins

Synthesis of all three types of RNA

26 / 100

Category: Biology

Q44 Study of fossils is called

A. Mammalogy

B. Paleontology

C. Herpetology

D. Ornithology

27 / 100

Category: Biology

Q.32 In the ascent of sap, water moves up in:

A. Xylem

B. Cambium

C. Phloem

D. Endodermis

28 / 100

Category: Biology Ch 5 Class 11

Five steps of the lytic cycle of a T4 stage are given below:

The T4 phage uses its tails to stick to specific receptor
The cell’s metabolic machinery, directed by phage DNA, produces phage proteins and nucleotides from the cells degraded DNA are used to make copies of the phage genome.
The phage then directs production of an enzyme that digests the cell.
The empty capsid of the phage is left as a ghost outside the cell
The sheath of the tail contracts, thrusting a hollow core through the wall and membrane of the cell.
Which of the following is the correct sequence of the cycle?

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

A) 3-5-4-2-1

B) 2-4-5-1-3

C) 5-1-4-2-3

D) 1-5-4-2-3

29 / 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

30 / 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

31 / 100

Category: Biology

What part of the brain integrates sensory information such as pain and temperature?

NUMS Mock 2
Biology
Coordination and Control

A) Forebrain

B) Midbrain

C) Hindbrain

D) Spinal cord

32 / 100

Category: Biology Ch 9 Class 11

Which of the following is included in Bryophytes?

NTS 2011
Biology
Kingdom Plantae
Elimination Tool:

A) Mosses

B) Club mosses

C) Ferns

D) Seed plants

33 / 100

Category: Biology Ch 10 Class 12

______ occurs because natural selection gives some alleles a better chance of survival than others:

PMC 2020
Biology
Evolution
Elimination Tool:

A) Fitness

B) Evolution

C) Crossing over

D) Artificial Selection

34 / 100

Category: Biology Ch 13 Class 11

The maximum amount of oxygen which normal human blood absorbs and carries at sea level is how many ml per 100 ml of blood?

PMC Sample 2
Biology
Gaseous Exchange
Elimination Tool:

A) 10

B) 20

C) 30

D) 40

35 / 100

Category: Biology Ch 3 Class 12

Hepatic and Pancreatic secretions are also stimulated by a hormone called:

NUMS 2016
Biology
Coordination and Control
Elimination Tool:

A) Gastrin

B) Secretin

C) Insulin

D) Glucagon

36 / 100

Category: Biology Ch 5 Class 12

Function of intercalary meristems is

. Increase in length

Increase in diameter

Production of leaves and flowers

None of these

37 / 100

Category: Biology

Q.48 Which of the following is incorrectly matched?

A. Glucagon- Beta cells

B. Corpus luteum- Progesterone

C. Insulin- Diabetes mellitus

D. Thyroid gland- Grave’s disease

38 / 100

Category: Biology Ch 8 Class 12

A pea plant has purple colored flowers (dominant trait). To check the genotype, which of the following cross is performed

NUMS 2018
Biology
Variation and Genetics
Elimination Tool:

A) Test cross with homozygous white flowered plant

B) Test cross with homozygous purple flowered plant

C) Test cross with heterozygous purple flowered plant

D) Hybird cross

39 / 100

Category: Biology

What are the functions of the inter, motor and sensory neurons in a reflex response?

NUMS Mock 4
Biology
Coordination and Control

A) Option A

B) Option B

C) Option C

D) Option D

40 / 100

Category: Biology Ch 2 Class 11

he molecule used by most of the animals for long-term energy storage is:

NUMS 2016
Biology
Biological Molecules
Elimination Tool:

A) Glycogen

B) Starch

C) Fat

D) Cholesterol

41 / 100

Category: Biology Ch 11 Class 11

The inner membrane of mitochondrion has many infoldings into the inner chamber, these folding are called as:

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) Cristae

B) Cisternae

C) Matrix

D) F1 particles

42 / 100

Category: Biology Ch 7 Class 12

In plants mitotic apparatus consists of

Centriole

Centriole and asters

Centrioles, asters and spindles

Spindles only

43 / 100

Category: Biology

Which type of protein structure contains the three dimensional structure?

NUMS Mock 3
Biology
Biological Molecules

A) Primary

B) Secondary

C) Tertiary

D) Quaternary

44 / 100

Category: Biology Ch 3 Class 11

If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of

Enzymes get denatured at higher substrate conc.

Rate of reaction is indirectly proportional to substrate concentration at this point.

All the active sites on enzyme molecule are occupied.

None of these.

45 / 100

Category: Biology Ch 10 Class 12

During aristotle time, it was thought that

PMC Sample 3
Biology
Evolution
Elimination Tool:

A) oranisms ranged from simple to complex

B) one type of organisim give rise to another type of organism

D) all living things specially created by nature

C) both a & b

46 / 100

Category: Biology

Q47 The T-lymphocytes and B-lymphocytes are the major cells of the:

A. Thymus

B. Lymph nodes

C. Adrenal glands

D. Lymphatic vessels

47 / 100

Category: Biology Ch 2 Class 12

In presence of muscle contraction, ______ is brought closer, _____ shortens and ______ disappears.

NUMS 2019 Reconduct
Biology
Support and Movement
Elimination Tool:

A) Z – line, H – zone, I – band

B) I – band, Z – line, H – zone

C) Z – line, I – band, H – zone

D) H – zone, I – band, Z – line

48 / 100

Category: Biology Ch 10 Class 12

Most of the fossils are found in which of the following?

PMC Sample 1
Biology
Evolution
Elimination Tool:

A) Metamorphic rocks

B) soil

C) Volcanic mountains

D) Sedimentary rocks

49 / 100

Category: Biology Ch 3 Class 12

Thyroid gland requires high amount of:

NUMS 2016
Biology
Coordination and Control
Elimination Tool:

A) Phosphate

B) Calcium

C) Iodine

D) Sodium

50 / 100

Category: Biology Ch 7 Class 12

Which is a feature of malignant tumor?

Localized

Little deleterious effect

Few mitosis

Metastasize

51 / 100

Category: Biology Ch 2 Class 12

Poliomyelitis normally affects the:

NUMS 2014
Biology
Support and Movement
Elimination Tool:

A) Legs

B) Brain

C) Spinal cord

D) Both B and C

52 / 100

Category: Biology Ch 4 Class 11

Factory of ribosomal systhesis is

Cytoplasm

Nucleus

Nucleolus

Endoplasmic reticulum

53 / 100

Category: Biology Ch 4 Class 11

Which of the following cells does not have nucleus?

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Muscle cell

B) Nerve cell

C) White Blood cell

D) Red Blood cell

54 / 100

Category: Biology Ch 5 Class 12

The individual with harelip shows which of the following conditions?

NUMS 2014
Biology
Growth and Development
Elimination Tool:

A) Hard palate

B) Polydactyl

D) Microcephale

C) Cleft Palate

55 / 100

Category: Biology Ch 9 Class 12

Lambda phage is

Virus

Bacterium

Plasmid

Host cell

56 / 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

57 / 100

Category: Biology Ch 2 Class 12

Which of the following statement about an arthropod exoskeleton is incorrect?

It permits gaseous exchange.

It contains joints, for the same purpose as present in human skeletal system.

It provides muscle attachment.

Like all the other types of exoskeleton, they lack sensation.

58 / 100

Category: Biology Ch 3 Class 11

If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction.

increase in concentration of enzyme

increase in concentration of substrate

increase in pH

increase in temperature

59 / 100

Category: Biology Ch 10 Class 12

The ultimate source of all changes is:

NUMS 2015
Biology
Evolution
Elimination Tool:

A) Mutation

B) Migration

C) Genetic drift

D) Change in allele frequency

60 / 100

Category: Biology

Q.21 All of the following are true for platyhelminthes except:

A. Flatworms

B. Triploblastic

C. Coelomates

D. Bilateral symmetry

61 / 100

Category: Biology

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

NUMS Mock 4
Biology
Evolution

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

62 / 100

Category: Biology Ch 9 Class 11

The space between the overtopped dichotomous branches was occupied by a sheet of which cells during evolution of megaphylls?

PMC Sample 2
Biology
Kingdom Plantae
Elimination Tool:

A) Sclerenchyma

B) Parenchyma

C) Collenchyma

D) Chlorenchyma

63 / 100

Category: Biology

Q.37 Which of the following neuron has a single long dendron?

A. Sensory neurons

B. Motor neurons

C. Inter neurons

D. Efferent neurons

64 / 100

Category: Biology Ch 10 Class 12

Natural selection can amplify or diminish variations that are

Non heritable

Heritable

Both heritable and non heritable

Acquired

65 / 100

Category: Biology Ch 10 Class 12

Inheritance of acquired characteristics is based on:

NTS 2016 DUHS & JSMU
Biology
Evolution
Elimination Tool:

A) Genetic role in reproduction

B) Use and disuse of organ

C) Survival of the fittest

D) Mutations

66 / 100

Category: Biology

The movement of plants in response to touch stimulus is called:

NUMS Mock 4
Biology
Support and Movement

A) Hydrotropism

B) Chemotropism

C) Geotropism

D) Thigmotropism

67 / 100

Category: Biology Ch 3 Class 11

If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because:

There is probably more substrate present than there is enzyme.

There is probably more enzayme available than there is substrate.

There is probably more product present than there is either substrate or enzyme.

The enzyme substrate complex is probably failing to form during the reaction.

68 / 100

Category: Biology Ch 9 Class 12

By PCR we mean:

UHS 2018
Biology
Biotechnology
Elimination Tool:

A) Polymerase chronic reaction

B) Polymerase chain reaction

C) Polymerase copy reaction

D) Polymerase cross reaction

69 / 100

Category: Biology Ch 9 Class 11

Mosses are included in sub-division

Anthoceropsida

Hepaticopsida

Bryopsida

Lycopsida

70 / 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

71 / 100

Category: Biology

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

NUMS Mock 2
Biology
Kingdom Prokaryote

A) Steam

B) Dry heat

C) Filtration

D) Radiation

72 / 100

Category: Biology Ch 10 Class 11

Which one of following is a true fish?

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Cuttle fish

B) Silver fish

C) Jelly fish

D) Sea fish

73 / 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

74 / 100

Category: Biology Ch 9 Class 11

The botanical name of gum tree ls:

NTS 2013
Biology
Kingdom Plantae
Elimination Tool:

A) Acacia nilotica

B) Mimosa pudlca

C) Acacla catechu

D) Prosopls glandulose

75 / 100

Category: Biology Ch 10 Class 11

Coelom that develops from the archenteron as outpouching is

Pseudocoelom

Enterocoelom

Schizocoelom

None of these

76 / 100

Category: Biology Ch 12 Class 11

Optimum pH for action of pepsin and salivary amylase is

NTS 2016 DUHS & JSMU
Biology
Nutrition
Elimination Tool:

A) 3.5 and 7.7 respectively

B) 1.8 and 6.8 respectively

C) 6.8 and 7.4 respectively

D) 1.8 and 7.4 respectively

77 / 100

Category: Biology

Q.9 A surfactant is essential for:

A. Efficient gas exchange

B. Maintaining structural integrity of alveoli

C. Both A and B

D. None of these

78 / 100

Category: Biology Ch 8 Class 12

Ahmed’s blood CANNOT clot properly; he was diagnosed with hemophilia A. He passed this trait to his grandson through his:

NUMS 2019 Reconduct
Biology
Variation and Genetics
Elimination Tool:

A) Wife

B) Son

C) Daughter

D) Brother

79 / 100

Category: Biology

Q.38 The cell organelles involved, in some cases, with extra-cellular digestion

A. Golgi complex

B. Lysosomes

C. Peroxisomes

D. Glyoxysomes

80 / 100

Category: Biology Ch 8 Class 12

Genotype of blood group ‘AB’ in human is ______.

NUMS 2015
Biology
Variation and Genetics
Elimination Tool:

A) IA IB

B) IB Io

C) IA IA

D) IoIo

81 / 100

Category: Biology Ch 10 Class 12

Who developed a theory of natural selection essentially identical to Darwin’s?

PMC Sample 2
Biology
Evolution
Elimination Tool:

A) Hardy-Weinberg

B) Malthus

C) Lamark

D) Alfred Wallace

82 / 100

Category: Biology Ch 4 Class 11

_______ is involved in lipid synthesis/metabolism.

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Smooth endoplasmic reticulum

B) Rough endoplasmic reticulum

C) Mitochondria

D) Vacuoles

83 / 100

Category: Biology

Q.24 When was the bacteriopbage phenomena rediscovered by D’Herelle?

A. 1918

B. 1917

C. 1920

D. 1990

84 / 100

Category: Biology

The inhibitor which closely resembles the substrate in its molecular structure and inhibits the enzyme activity by binding to the active site of the enzyme is called:

NUMS Mock 4
Biology
Enzymes

A) Feedback inhibitor

B) Non-competitive inhibitor

C) Allosteric modulator

D) Competitive inhibitor

85 / 100

Category: Biology Ch 5 Class 11

Viruses are ______ smaller than bacteria

10 – 100 times

10 – 1000 times

1000 – 10000 times

86 / 100

Category: Biology Ch 12 Class 12

Ecosystem of Shogran is

Coniferous alpine

Boreal

temperate deciduous

Grassland

87 / 100

Category: Biology

Q.55 Immunogen is a foreign substance and stimulates the formation of:

A. Antitoxins

B. Antiserum

C. Antibodies

D. Lymph

88 / 100

Category: Biology Ch 8 Class 11

Which of the following fungi is utilized in the baking industry?

NTS 2011
Biology
Kingdom Fungi
Elimination Tool:

A) Mushrooms

B) Yeast

C) Bread mold

D) Penicillium

89 / 100

Category: Biology Ch 4 Class 12

In human females, oocytes are held in the second metaphase until ________.

NUMS 2019 Reconduct
Biology
Reproduction
Elimination Tool:

A) Death

B) Birth

C) Ovulation

D) Fertilization

90 / 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

91 / 100

Category: Biology Ch 11 Class 11

What is the function of Ribulose?

PMC 2020
Biology
Bioenergetics
Elimination Tool:

A) Intermediates in photosynthesis

B) Respiratory fuel

C) Intermediates in cellular respiration

D) Component of DNA and RNA

92 / 100

Category: Biology

Q.23 Reflex action is type of

A. Voluntary action

B. Involuntary action

C. Saltatory conduction

D. None of these

93 / 100

Category: Biology Ch 10 Class 11

Flame cells are commonly found in:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Platyhelminthes

B) Annelida

C) Coelenterate

D) All of above

94 / 100

Category: Biology Ch 2 Class 11

Reactions in which simple substances are combined to form complex substances are called:

Metabolic reactions

Catabolic reactions

Anabolic reactions

None of these

95 / 100

Category: Biology

Q.53____________________are among smallest known virus

A. Picornavirus

B. Parvoviruses

C. Herpes virus

D. Rotavirus

96 / 100

Category: Biology Ch 12 Class 11

Secretion of pancreatic juice is stimulated by:

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Secretin

B) Gastrin

C) Pepsinogen

D) Both secretin and gastrin

97 / 100

Category: Biology Ch 4 Class 12

Which of the following is an ovoviviparous animal?

PMC Sample 1
Biology
Reproduction
Elimination Tool:

A) basking shark

B) humans

C) blue shark

D) all of these

98 / 100

Category: Biology Ch 10 Class 12

If allele frequency for a dominant allele is 0.4. What will be the number of heterogeneous individuals if the population is of 100 individuals with diploid traits.

NUMS 2015
Biology
Evolution
Elimination Tool:

A) 36

B) 48

C) 52

D) 74

99 / 100

Category: Biology Ch 5 Class 12

Cells of fibers and tracheids elongate during

Phase of cell division

Phase of cell elongation

Phase of cell maturation

Phase of cell differentiation

100 / 100

Category: Biology Ch 10 Class 12

Adaptations that an organism acquires by its own actions are

Heritable

Not heritable

Can be made heritable through some modifications

Both heritable and not heritable

Your score is

The average score is 61%

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