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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Biology Practice Test 4

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1 / 100

Category: Biology Ch 5 Class 12

Higher plants grow through

Growing points

Whole plant body is capable of growing

Only roots grow

None of these

2 / 100

Category: Biology Ch 5 Class 11

HIV is also known as:

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

A) AIDS

B) HAV

D) HBV

C) HTLV

3 / 100

Category: Biology Ch 8 Class 12

A continuously varying trait is encoded by alleles of two or more different genes located at different loci, all influencing the same trait in an additive way is known as ________.

NUMS 2019 Cancelled
Biology
Variation and Genetics
Elimination Tool:

A) Poly traits

B) Polygenes

C) Multiple alleles

D) Different gene

4 / 100

Category: Biology Ch 8 Class 11

Foliose lichen are

Stem like

Branching

Leaf like

Crust like

5 / 100

Category: Biology Ch 9 Class 12

During gel electrophoresis, the gel used is:

NUMS 2020
Biology
Biotechnology
Elimination Tool:

A) Agar gel

B) Agarose gel

C) Dextran

D) Toluene gel

6 / 100

Category: Biology Ch 3 Class 11

Inhibitors which block the enzyme by forming weak bond are called

Competitive inhibitors.

Non-competitive inhibitors

Irreversible inhibitors.

Both a and b

7 / 100

Category: Biology

The excretion of hypertonic urine in humans is associated best with the:

NUMS Mock 1
Biology
Homeostasis

A) Glomerular capsule

B) Proximal convoluted tubule

C) Loop of Henle

D) Distal convoluted tubule

8 / 100

Category: Biology Ch 7 Class 11

Of the following which one has glassy shells?

Radiolarians

Forams

Both of these

None of these

9 / 100

Category: Biology Ch 3 Class 11

Which step causes activation of catalytic site of an enzyme?

Change in pH of the surroundings.

Formation of Enzyme Susstrate complex.

Change in the charge of the active site.

Change in temperature

10 / 100

Category: Biology

How many fatty acid molecules are normally present in a fat or oil molecule?

NUMS Mock 4
Biology
Biological Molecules

A) 1

B) 2

C) 3

D) 4

11 / 100

Category: Biology Ch 4 Class 11

Which type of movement through the cell membrane is not an energy-consuming process?

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Endocytosis

B) Exocytosis

C) Active transport

D) Osmosis

12 / 100

Category: Biology

In semi-conservative replication, which of the following is true regarding the separation of two strands?

NUMS Mock 2
Biology
Chromosomes and DNA

A) Primary structure is conserved, and secondary structure is disturbed

B) Secondary structure is conserved, and the primary structure is disrupted

C) both the primary and secondary structures are conserved

D) Both the primary and secondary structures are disrupted

13 / 100

Category: Biology

Q.54 First cardiac sound is associated with:

A. Closure of tricuspid and bicuspid valves

B. Closure of semilunar valves

C. Opening of tricuspid valves

D. Opening of semilunar valves

14 / 100

Category: Biology Ch 4 Class 11

_______ organelles are involved in the synthesis of the plant cell wall.

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Endoplasmic reticulum

B) Golgi complex

C) Lysosomes

D) Peroxisomes

15 / 100

Category: Biology Ch 11 Class 11

Glucose → 2 pyruvic acid + 2H2O

2ADP + 2Pi → 2 ATP

2NAD + 4H → 2NADH + 2H+

These three reactions collectively constitute ______.

NTS 2012
Biology
Bioenergetics
Elimination Tool:

A) Kreb’s cycle

B) Calvin’s cycle

C) Electron Transport Chain

E) Glycolysis

16 / 100

Category: Biology Ch 11 Class 11

Stroma of chloroplast carries the fixation of:

NUMS 2014
Biology
Bioenergetics
Elimination Tool:

A) Nitrogen

B) Oxygen

C) Carbon monoxide

D) Carbon dioxide

17 / 100

Category: Biology Ch 9 Class 12

The process of determining the locus for particular biological traits includes?

PMC Practice 2
Biology
Biotechnology
Elimination Tool:

A) Replication

B) Recombination

C) Gene mapping

D) None of these options is correct

18 / 100

Category: Biology Ch 13 Class 11

Four plants are present in different environmental conditions. Plant A is present in a warm climate with continuous rainfall, plant B is present in a cool forest, plant C is present in a warm climate with little breeze, while plant D is present in a warm climate with high wind speed. Which one of the above plants will have the highest rate of transpiration?

UHS 2019
Biology
Gaseous Exchange
Elimination Tool:

A) Plant B

B) Plant D

C) Plant A

D) Plant C

19 / 100

Category: Biology Ch 3 Class 12

On land, frogs are:

NUMS 2014
Biology
Coordination and Control
Elimination Tool:

A) Hypermetric

B) Cerebral cortex

C) Normal sighted

D) None of these

20 / 100

Category: Biology Ch 13 Class 11

The glycolate produced diffuses into the membrane bounded organelles called

Glyoxisomes

Peroxisomes

Lysosomes

Mitochondria

21 / 100

Category: Biology Ch 1 Class 12

In humans, the temperature regulation control center is located in:

PMC 2020
Biology
Homeostasis
Elimination Tool:

A) Kidneys

B) Brain

C) Lungs

D) Liver

22 / 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

23 / 100

Category: Biology Ch 9 Class 12

Transgenic organisms:

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) Have a foreign gene inserted into them

B) Have an important role in the large scale production of medicinal products

C) Are considered beneficial to humans

D) All of the above

24 / 100

Category: Biology Ch 13 Class 11

Oxygen is transported by combining with ……….. in Hb.

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) Nitrogen

B) Iron

D) Hydrogen

C) Carbon

25 / 100

Category: Biology Ch 12 Class 11

Autotrophic organisms can exist in an exclusively ______ environment.

Organic

Inorganic

Wet

Terrestrial

26 / 100

Category: Biology Ch 12 Class 11

Scurvy is caused by deficiency of vitamin ______.

NTS 2016 DUHS & JSMU
Biology
Nutrition
Elimination Tool:

A) A

B) B

C) C

D) D

27 / 100

Category: Biology Ch 3 Class 12

The phytohormones controlling the plant movements are?

NTS 2015 SMBBMC
Biology
Coordination and Control
Elimination Tool:

A) Auxins

B) Gibberellins

C) Abscisic acid

D) Cytokinins

E) All of the above

28 / 100

Category: Biology Ch 7 Class 11

The nucleoid is found only in certain species of:

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) Gram positive bacteria

B) Both gram positive and gram negative bacteria

C) Gram negative bacteria

D) All bacteria

29 / 100

Category: Biology Ch 9 Class 12

Bacterial cells take up recombinant plasmids when they are treated with:

UHS 2015
Biology
Biotechnology
Elimination Tool:

A) CaCl2

B) NaCl

C) KCl

D) NaOH

30 / 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.

31 / 100

Category: Biology Ch 13 Class 11

During inspiration, the diaphragm:

PMC Practice 3
Biology
Gaseous Exchange
Elimination Tool:

A) Contracts

B) Relaxes

C) Contracts and relaxes

D) None of these options is correct

32 / 100

Category: Biology Ch 6 Class 11

The word Archaeobacteria (a division of bacteria) derived from Greek means

True bacteria

False bacteria

Recent bacteria

Ancient bacteria

33 / 100

Category: Biology Ch 10 Class 11

The mammals termed as the connecting link between reptilians and mammals are:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Marsupials

B) Eutherians

C) Monotremes

D) Metatherians

34 / 100

Category: Biology

On receiving the news of the sudden demise of a close friend; which is the most probable hormone that is secreted at that time?

NUMS Mock 1
Biology
Coordination and Control

A) Prostaglandin

B) Growth inhibitors

C) Estrogen

D) Adrenaline

35 / 100

Category: Biology Ch 11 Class 11

At which times there is no net gaseous exchange between leaves and the atmosphere.

Day time.

Night time

Dawn & Dusk

Mid night

36 / 100

Category: Biology Ch 8 Class 11

The Kingdom of recyclers is known as kingdom

Algae

Bacteria

Fungi

Embryophata

37 / 100

Category: Biology Ch 6 Class 11

Which of the following bacteria do not have flagella commonly?

Cocci

Bacilli

Streptobacilli

Vibrio

38 / 100

Category: Biology Ch 13 Class 11

The oxygen-binding protein present in skeletal muscles is:

NUMS 2017
Biology
Gaseous Exchange
Elimination Tool:

A) Globin

B) Glycogen

C) Myo Glycogen

D) Myoglobin

39 / 100

Category: Biology Ch 12 Class 11

Of the following, which one is missing in herbivores?

Premolars

Canines

Incisors

Molars

40 / 100

Category: Biology Ch 10 Class 11

The radial symmetry is found in the animals of

Protozoa

Porifera

Cnidaria

All of these

41 / 100

Category: Biology Ch 7 Class 12

Crossing over occur between ____________ of homologous chromosomes:

PMC Sample 1
Biology
Cell Cycle
Elimination Tool:

A) Sister pair of chromatid

B) Sister chromatids of homologous

C) Non-sister chromatin

D) All of them

42 / 100

Category: Biology

While working in a laboratory, before studying a sample under the microscope, it was immersed in a dye solution to obtain ______.

NUMS Mock 1
Biology
Biology and its Major Fields of Specialization

A) Magnification

B) Image

C) Match

D) Contrast

43 / 100

Category: Biology Ch 13 Class 12

Overgrazing results in:

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Totally barren lands

B) Good pastured lands

C) Salinity

D) Rocky areas

44 / 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

45 / 100

Category: Biology

Phenylmethyl ketone can be converted into ethyl benzene in one step by using:

NUMS Mock 4
Chemistry
Aldehydes and Ketones

A) LiAlH4

B) Zn(Hg)-HCl

C) NaBH4

D) CH3Mgl

46 / 100

Category: Biology

Q.19 Darwins theory mainly focuses o

A. Origin of life

B. How Orgais extinct

C. How new Species arise

D How organism form

47 / 100

Category: Biology Ch 7 Class 12

During interphase of the cell cycle, which of the following stage is for duplication of DNA:

NUMS 2019 Reconduct
Biology
Cell Cycle
Elimination Tool:

A) G0 phase

B) G1 phase

D) S phase

C) G2phase

48 / 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

49 / 100

Category: Biology Ch 5 Class 11

The size of poxvirus is:

20 nm

200 nm

250 nm

300 nm

50 / 100

Category: Biology

Q.1 In all plants the major sites of photosynthesis are?

A. Leaf

B.Stems

C. Roots

D. Branches

51 / 100

Category: Biology

During cell division, the spindle fibres get attached to condensing chromosome at a highly differentiated region. This region is called as:

NUMS Mock 1
Biology
Cell Cycle

A) Chromosome

B) Chromocentre

C) Centriole

D) Kinetochore

52 / 100

Category: Biology Ch 2 Class 12

Which vertebrae together are called pelvic vertebrae?

NUMS 2020
Biology
Support and Movement
Elimination Tool:

A) Coccygeal and lumbar

B) Sacral and lumbar

C) Sacral and coccygeal

D) Sacral and thoracic

53 / 100

Category: Biology Ch 6 Class 12

In Maxam – Gilbert method, DNA threads are:

NUMS 2015
Biology
Chromosomes and DNA
Elimination Tool:

A) Chemically synthesized

B) Synthesized from mRNA

C) Synthesized by using terminating nucleotides

D) Chemically cut into pieces

54 / 100

Category: Biology

Q.65 Which of the following statements about the systemic affect of bacterial cells are true?

A. Gram-negative bacteria are more likely to cause systemic effects because their lack of an outer membrane means they can more quickly infect host cells.

B. Gram-negative bacteria are more likely to cause Systemic effects because the outer membrane protects them from antibiotics

C. Both A and B

D. None of these

55 / 100

Category: Biology Ch 13 Class 12

Process that supplies food to living things through decaying and decomposition is called

. Food cycle

Nutrient cycle

Dead-live cycle

None of these

56 / 100

Category: Biology Ch 3 Class 12

In plants, ______ hormone promotes closing of stomata in drought conditions.

NUMS 2019 Reconduct
Biology
Coordination and Control
Elimination Tool:

A) Ethene

B) Gibberellins

C) Cytokinins

D) Abscisic acid

57 / 100

Category: Biology Ch 7 Class 12

Most critical phase of mitosis is

Prophase

Anaphase

Metaphase

Telophase

58 / 100

Category: Biology Ch 5 Class 12

The cells in our body are all genetically identical, apart from the:

PMC 2020
Biology
Growth and Development
Elimination Tool:

A) Somatic cells

B) Reproductive cells

D) White blood cells

C) Muscle fibers

59 / 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

60 / 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

61 / 100

Category: Biology

Q.26 Two pea plants are crossed. One plant is homozygous dominant for purple flowers, and the other is homozygous recessive for white lowers. What fraction of the F2 population will have white lowers?

A. 1/4

B. 1/2

C. 1/8

D. 1/16

62 / 100

Category: Biology Ch 8 Class 12

______ are more common in human males than females.

NUMS 2016
Biology
Variation and Genetics
Elimination Tool:

A) X-linked dominant traits

B) X-linked recessive traits

C) Y-linked dominant traits

D) Autosomal linked recessive traits

63 / 100

Category: Biology

As pH of blood decreases, H+ ions increases, which combine the proteins part of hemoglobin, to decrease its ability to bind with:

NUMS Mock 2
Biology
Gaseous Exchange

A) O2

B) CO2

C) CO

D) H2

64 / 100

Category: Biology

Q.20 Cytochromes are electron transport intermediates containing?

A. myoglobin

B. heam

C. globulin

D. fibrin

65 / 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

66 / 100

Category: Biology Ch 13 Class 11

During breathing air from Pharynx enters to:

UHS 2018
Biology
Gaseous Exchange
Elimination Tool:

A) Trachea

B) Bronchioles

C) Alveoli

D) Bronchi

67 / 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

68 / 100

Category: Biology Ch 10 Class 11

In some cases the blastomere can produce complete embryo the cleavage will be

Spiral and determinate

Radial and indeterminate

Spiral and indeterminate

Radial and determinate

69 / 100

Category: Biology Ch 8 Class 11

Root like structure in saprotrophic fungi are called

Rhizodis

Haustoria

Hyphae

Constricting rings

70 / 100

Category: Biology Ch 10 Class 12

Important point/s of Lamarck’s theory

Use and disuse of organs

Inheritance of acquired characters

Natural selection

Both a and b

71 / 100

Category: Biology Ch 11 Class 12

The actual location or place where an organism lives is

Environment

Biosphere

Biomass

Habitat

72 / 100

Category: Biology Ch 8 Class 11

Fungi store surplus food in the form of

UHS 2010
Biology
Kingdom Fungi
Elimination Tool:

A) Cellulose

B) Glycogen

C) Starch

D) Both B and C

73 / 100

Category: Biology

Q.27 The stimulus for the production of more gastrin hormone from the gastric endocrine lining is:

A. Protein content of the food

B. Carbohydrate content of the food

C. Lipid content of the food

D. Partially digested food nutrients

74 / 100

Category: Biology Ch 10 Class 12

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

Hardy-Weinberg

Alfred Wallace

Malthus

Lyell

75 / 100

Category: Biology Ch 9 Class 11

The botanical name of Imli is:

NTS 2012
Biology
Kingdom Plantae
Elimination Tool:

A) Cassia fistula

B) Mimosa pudica

C) Tamarindus indica

D) Datura alba

76 / 100

Category: Biology Ch 5 Class 11

Virus is a _____ entity among living and non-living.

PMC Sample 2
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Balanced

B) Transitional

C) Threshold

D) None of these options is correct

77 / 100

Category: Biology Ch 4 Class 12

Pituitary gland releases ______ hormone and _______ hormone while ovaries produce _______ and progesterone.

NTS 2019
Biology
Reproduction
Elimination Tool:

A) Follicle-stimulating and luteinizing, estrogen

B) Estrogen and follicle-stimulating, luteinizing

C) Luteinizing arid estrogen, follicle-stimulating

D) Follicle-stimulating and estrogen, luteinizing

78 / 100

Category: Biology Ch 6 Class 11

Which of the following is true of both bacterial conjugation and meiosis?

PMC Practice 3
Biology
Kingdom Prokaryote
Elimination Tool:

A) Both processes produce four haploid cells

B) Both processes are a form of asexual reproduction

C) Both processes involve genetic recombination

D) None of these options is correct

79 / 100

Category: Biology Ch 1 Class 11

A series of hypothesis supported by the results of many tests is called

Scientific law

Theory

Deduction

80 / 100

Category: Biology Ch 4 Class 12

Only one ovary is functional at a time in:

NUMS 2015
Biology
Reproduction
Elimination Tool:

A) Human

B) Eagle

C) Chicken

D) Pigeon and human

81 / 100

Category: Biology Ch 7 Class 12

In which stage of meiotic division centromere divides?

NUMS 2017
Biology
Cell Cycle
Elimination Tool:

A) Anaphase I

B) Anaphase II

C) Metaphase II

D) Both A and B

82 / 100

Category: Biology Ch 14 Class 11

75% osmotic pressure of blood is maintained by:

NUMS 2015
Biology
Transport
Elimination Tool:

A) Globulin

C) Fibrinogen

B) Prothrombin

D) Albumin

83 / 100

Category: Biology

NAD is an example of:

NUMS Mock 1
Biology
Biological Molecules

A) Mononucleotide

B) Dinucleotide

C) Trinucleotide

D) Tetranucleotide

84 / 100

Category: Biology

Q.66 Which one of the following is a non-protein group covalently bonded to a few respiratory enzymes among others?

A. Nicotine adenine dinucleotide

B. Flavin adenine dinucleotide

C. Nicotinamide adenine dinucleotide phosphate

D. All of the above

85 / 100

Category: Biology Ch 9 Class 11

The first cell of the sporophyte generation is

Oospore

Spore mother cel

Spore

Gamete

86 / 100

Category: Biology Ch 6 Class 12

DNA contains

Purines (A and G) pyrimidines (U and (c)

Purines (T and (c) pyrimidines (A and G)

Purines (A and (c) pyrimidines (U and G)

Purines (A and G) pyrimidines (T and (c)

87 / 100

Category: Biology Ch 6 Class 11

Which of the following structures provides greater pathogenicity to the bacteria?

PMC Practice 3
Biology
Kingdom Prokaryote
Elimination Tool:

A) Slime

B) Cell wall

C) Cell membrane

D) Capsule

88 / 100

Category: Biology Ch 2 Class 12

Pectoral fins are enlarged in:

NUMS 2015
Biology
Support and Movement
Elimination Tool:

A) Whales

B) Sharks

C) Skates

D) Plaice

89 / 100

Category: Biology Ch 1 Class 12

The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called

Homeostasis

Hemostasis

Osmoregualtion

Thermoregulation

90 / 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

91 / 100

Category: Biology Ch 9 Class 11

Which of the following statement about alternation of generation in bryophytes is incorrect?

It involves alternation of morphologically different generations

Their gametophyte is independent while sporophyte depends upon gametophyte for nutrition.

Both the gametophyte and sporophytes are haploid generations thus can produce haploids gametes to continue the diploid number on fertilization

pore formation occurs through meiosis

92 / 100

Category: Biology Ch 2 Class 12

The radius and ulna join at the wrist with the _____ small carpal bones.

NTS 2016 SMBBMC
Biology
Support and Movement
Elimination Tool:

A) 4

B) 6

C) 7

D) 8

93 / 100

Category: Biology Ch 7 Class 12

Exchange of segments between homologous chromosomes is called:

UHS 2012
Biology
Cell Cycle
Elimination Tool:

A) Segregation

B) Independent assortment

C) Crossing over

D) Mutation

94 / 100

Category: Biology Ch 7 Class 11

Plasmodium belongs to

Ciliates

Apicomplexans

Actinopods

Foraminferans

95 / 100

Category: Biology

When the concentration of the external medium is equal to the concentration of the internal medium of a cell, the situation is called:

NUMS Mock 1
Biology
Biological Molecules

A) Hypertonic

B) Hypotonic

C) Isotonic

D) Heterotonic

96 / 100

Category: Biology Ch 9 Class 12

Chemical nature of primers used in the PCR process is _______.

UHS 2018
Biology
Biotechnology
Elimination Tool:

A) RNA

B) Protein

C) Carbohydrate

D) DNA

97 / 100

Category: Biology Ch 1 Class 12

Rapid movement of leaves of mimosa on touching is an example of :

Turgor movement

Nastic movement

Tropic movements.

Growth movement

98 / 100

Category: Biology Ch 1 Class 12

Secondary cell wall of sclerenchyma cells is impregnated with

Cellulose

Peptidoglycan and murein.

Lignin

Pectin

99 / 100

Category: Biology Ch 9 Class 12

Transgenic plants are produced when foreign genes are introduced into

Mature plant embryo

Immature plant embryo

Roots

Leaves

100 / 100

Category: Biology

Q.6 Outbreeding increases which of the following?

A. Homozygosity

B. Heterozygosity

C. Gene linkage

D Gene pool

Your score is

The average score is 61%

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