Biology Practice Test 3

Biology Practice Test 3 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 genetics, evolution, ecology, biotechnology, and more, helping students improve accuracy and retention.

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1 / 100

Category: Biology

Q.61 Which of the following is a compensation point?

B. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants

C. Rate of photosynthesis increases, so do the O2 production, with a net release oxygen coupled with the uptake of CO2

D. Rate of respiration becomes more than rate of photosynthesis. 16 Net yield of H-O in Photosynthesis is

2 / 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

3 / 100

Category: Biology Ch 2 Class 11

Each β – chain of hemoglobin molecules contains ____ amino acids.

NUMS 2019 Reconduct
Biology
Biological Molecules
Elimination Tool:

A) 136

B) 146

D) 288

C) 235

4 / 100

Category: Biology Ch 9 Class 12

Commonly used restriction enzyme is

pSC 101

pBR 322

EcoRI

All of these

5 / 100

Category: Biology Ch 7 Class 11

Which of the following bacteria are able to release oxygen into the environment?

NTS 2018
Biology
Kingdom Protista
Elimination Tool:

A) Saprotrophic bacteria

B) Parasitic bacteria

C) Cyanobacteria

D) Pathogenic bacteria

6 / 100

Category: Biology

Nitrogen-fixing bacteria in root nodules fix nitrogen in soil air into:

NUMS Mock 1
Biology
Nutrition

A) Ammonia

B) Nitrite

C) Nitrate

D) Amino acid

7 / 100

Category: Biology

An Rh negative woman is married to an Rh positive man whose father was also Rh negative. What are the chances that their child will be affected?

NUMS Mock 4
Biology
Variation and Genetics

A) 25%

B) 50%

C) 75%

D) 100%

8 / 100

Category: Biology Ch 7 Class 12

Smooth endoplasmic reticulum is responsible for the metabolism of:

UHS 2019
Biology
Cell Cycle
Elimination Tool:

A) Nucleic acids

B) Proteins

C) Carbohydrates

D) Lipids

9 / 100

Category: Biology Ch 2 Class 11

% of water in brain cells is

20%

80%

85%

90%

10 / 100

Category: Biology Ch 1 Class 12

The place of attachment of leaf with the shoot is called:

Pith

Pit

Pulvinus

Ecdysone

11 / 100

Category: Biology Ch 2 Class 12

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

NTS 2010
Biology
Support and Movement
Elimination Tool:

A) Carpals

B) Metacarpals

C) Phalanges

D) Tarsal

12 / 100

Category: Biology Ch 10 Class 12

Natural selection can amplify or diminish variations that are?

PMC Sample 2
Biology
Evolution
Elimination Tool:

A) Heritable

B) non heritable

C) both a and b

D) acquired

13 / 100

Category: Biology Ch 4 Class 12

The human cells affected in HIV are which of the following?

PMC Sample 1
Biology
Reproduction
Elimination Tool:

A) RBCs

B) WBCs

C) Platelets

D) stem cells

14 / 100

Category: Biology Ch 13 Class 11

Chest cavity is bounded by ribs and muscles on the sides, while the floor of chest cavity is called:

NUMS 2019 Reconduct
Biology
Gaseous Exchange
Elimination Tool:

A) Pleura

B) Alveoli

C) Chest cage

D) Diaphragm

15 / 100

Category: Biology Ch 7 Class 11

Kingdom protista includes ______ phyla

16 / 100

Category: Biology Ch 3 Class 12

The sense organs of taste in tongue are known as:

NUMS 2014
Biology
Coordination and Control
Elimination Tool:

A) Olfactory receptors

B) Gustatory receptors

C) Cutaneous receptors

D) All of these

17 / 100

Category: Biology

Q.14 Protein coat of a virus enclosing nucleic acid is called?

A. Vector

B. Capsid

C. Plasmid

D. Genome

18 / 100

Category: Biology Ch 13 Class 12

Study of human population and things that affect them is

Ecology

Demography

Demology

Environment

19 / 100

Category: Biology

Q45 Which was the first virus to be successfully crystalized?

A. TMV

B. Smallpox

C. Poliovirus

D. Adenovirus

20 / 100

Category: Biology Ch 7 Class 11

These protists are mostly unicellular (a few are colonial) organisms with spherical or elongated bodies with a single central nucleus. They possess from one to many long, whip-like flagella that enable them to move. Flagellates move rapidly, pulling themselves forward by lashing flexible flagella that are usually located at the anterior end. Examples include trypanosome, euglena, etc.

The above give lines indicate which of the following group of protozoa:

NUMS 2017
Biology
Kingdom Protista
Elimination Tool:

A) Amoeba

B) Arthropods

C) Foraminifera

D) Zooflagellates

21 / 100

Category: Biology Ch 5 Class 11

First infectious disease against which effective method of prevention developed was a _______:

NUMS 2020
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Bacterial disease

B) Viral disease

C) Protozoan disease

D) Viroid disease

22 / 100

Category: Biology Ch 2 Class 11

The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called:

Chemistry

Biochemistry

Molocular biology

Both a and b

23 / 100

Category: Biology Ch 7 Class 12

_______ is the stage of mitosis characterized by the physical separation of ________ chromatids.

NTS 2019
Biology
Cell Cycle
Elimination Tool:

A) Interphase. Offspring

B) Telophase, F1 chromatids

C) Metaphase, Homologous

D) Anaphase. Sister

24 / 100

Category: Biology Ch 13 Class 11

Thick, waxy & leathery cuticle around leaves is present in which of the following?

PMC Sample 2
Biology
Gaseous Exchange
Elimination Tool:

A) Hydrophytes

C) Halophytes

B) Mesophytes

D) Xerophytes

25 / 100

Category: Biology Ch 11 Class 11

Which of the following statement about the head of a chlorophyll molecule is incorrect:

It is a porphyrin ring or tetrapyrrole ring structure

It is flat, square and light absorbing

Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen.

It is hydrophobic

26 / 100

Category: Biology Ch 6 Class 11

Which one of the following sets includes the bacterial diseases?

NUMS 2014
Biology
Kingdom Prokaryote
Elimination Tool:

A) Cholera, typhoid, mumps

B) Tetanus, tuberculosis, measles

C) Malaria, mumps, poliomyelitis

D) Diphtheria, leprosy, plague

27 / 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

28 / 100

Category: Biology Ch 9 Class 12

In prokaryotes only one type of RNA polymerase is present, while ______ types of RNA polymerase are present in eukaryotes.

NUMS 2019 Reconduct
Biology
Biotechnology
Elimination Tool:

A) Two

B) Three

C) Four

D) Five

29 / 100

Category: Biology Ch 3 Class 12

Which of the following is not the function of the cerebrum?

NUMS 2016
Biology
Coordination and Control
Elimination Tool:

A) Voluntary digestion

B) Thinking

C) Intelligence

D) Skeletal muscles

30 / 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

31 / 100

Category: Biology Ch 5 Class 12

The process of aging:

NUMS 2015
Biology
Growth and Development
Elimination Tool:

A) Can be slowed down by adequate sleep

B) Can be slowed down by regular meals

C) Cannot be slowed down in any way

D) can be slowed by adequate sleep and regular meal

32 / 100

Category: Biology Ch 3 Class 12

Which of the following statement about neuron is incorrect?

They not only conduct impulses but also generate them.

They are not the only cellular component of nervous system.

They may show limited regenerative capabilities.

Like all the living cell, when they mature and divide to form similar cells.

33 / 100

Category: Biology

Q.50 The cluster of pouches opened from alveolar ducts is known as

A. Bronchi

B. Bronchioles

C. Pharynx duct

D. Alveoli

34 / 100

Category: Biology Ch 6 Class 11

A bacterium with tuft of flagella at both poles is called

Lophotrichus

Monotrichous

Peritrichous

Amphitrichous

35 / 100

Category: Biology Ch 5 Class 12

Wood is not formed in:

NUMS 2015
Biology
Growth and Development
Elimination Tool:

A) Monocots

B) Dicots

C) Gymnosperms

D) All of given

36 / 100

Category: Biology Ch 11 Class 11

Three word equations are shown:

P. Carbon dioxide + water gives glucose + oxygen

Q. Glucose + oxygen gives carbon dioxide + water

R. Glucose gives alcohol + carbon dioxide

What is / are the equations for anaerobic respiration in yeast?

NTS 2015 SMBBMC
Biology
Bioenergetics
Elimination Tool:

A) P only

B) Q only

C) R only

D) all of the above

37 / 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

38 / 100

Category: Biology Ch 3 Class 11

A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called

Co-enzyme

Blocker

Inhibitor

Cofactor

39 / 100

Category: Biology Ch 6 Class 11

Flagella originate from

Cell membrane

Cell wall

Capsule

Basal body

40 / 100

Category: Biology

The idea that opposed the idea of abiogenesis was proposed by?

NUMS Mock 4
Biology
Cell Structure and Function

A) Robert Hooke

B) Robert Brown

C) Rudolph Virchow

D) Lorenz Oken

41 / 100

Category: Biology Ch 13 Class 12

Greenhouse gases are those that:

NUMS 2015
Biology
Man and His Environment
Elimination Tool:

A) Prevent entry of ultraviolet rays

B) Prevent rainfall

C) Prevent heat to escape

D) All given options are correct

42 / 100

Category: Biology Ch 2 Class 11

Glucose and fructose join together through _____ to form sucrose.

NUMS 2019 Reconduct
Biology
Biological Molecules
Elimination Tool:

A) 1, 4 glycosidic linkage

B) 1, 6 glycosidic linkage

C) 1,2 glycosidic linkage

D) 1,3 glycosidic linkage

43 / 100

Category: Biology Ch 11 Class 11

The light dependent reaction of photosynthesis occurs in:

NTS 2011
Biology
Bioenergetics
Elimination Tool:

A) Stroma of chloroplast

B) Guard cells of stomata

C) Thylakoid membrane of chloroplast

D) Cytoplasm of leaf cell

44 / 100

Category: Biology

DNA fingerprinting is basically done for:

NUMS Mock 1
Biology
Biotechnology

A) DNA cloning

B) DNA analysis

C) DNA sequencing

D) DNA splicing

45 / 100

Category: Biology Ch 3 Class 11

The number of substrate molecules converted into the product by one molecule of enzyme active site per unit time is called?

PMC Practice 2
Biology
Enzymes
Elimination Tool:

A) Turnover number

B) Substrate number

C) Reaction number

D) None of these options is correct

46 / 100

Category: Biology

Q.20 Cytochromes are electron transport intermediates containing?

A. myoglobin

B. heam

C. globulin

D. fibrin

47 / 100

Category: Biology Ch 9 Class 11

Which of the following statement about plants is incorrect?

All are eukaryotes

They are multicellular.

Non-motile organisms

Are heterotrophes

48 / 100

Category: Biology

The thick filaments, in a myofibril of muscles, are made of ________.

NUMS Mock 3
Biology
Support and Movement

A) Myoglobin

B) Myosin

C) Actin

D) Haemoglobin

49 / 100

Category: Biology Ch 7 Class 12

Gametes in animals are produced by:

PMC 2021 Tested
Biology
Cell Cycle
Elimination Tool:

A) Meiosis

B) Fission

C) Mitosis

D) All three

50 / 100

Category: Biology Ch 5 Class 11

Amoeba belongs to which kingdom:

Prokaryotae

Plantae

Monera

Protista

51 / 100

Category: Biology

Q48 Which statement is incorrect about Lock and Key Model?

A. Specific enzyme can transform only a specific substrate

B. Active site of an enzyme is a non-flexible structure

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

D. It explains the mechanism of every chemical reaction

52 / 100

Category: Biology Ch 7 Class 11

Based on molecular data euglenoids are thought to be closely related to

Dinoflagellates

Zooflagellates

Protozoans

Algae

53 / 100

Category: Biology Ch 9 Class 11

It looks like a single flower but it is in fact an inflorescence called:

NUMS 2014
Biology
Kingdom Plantae
Elimination Tool:

A) Pencil

B) Typical receme

C) Compound umbel

D) Capitulum

54 / 100

Category: Biology

Q37 The muscle contraction depends on:

A. Nerve impulse

B. Energy

C. Calcium

D. All of these

55 / 100

Category: Biology Ch 8 Class 12

Haemophilia occurs because of:

PMC 2020
Biology
Variation and Genetics
Elimination Tool:

A) Mutation in an autosome

B) Mutation of Y-chromosome

C) Mutation of X-chromosome

D) Deficiency of iron

56 / 100

Category: Biology Ch 9 Class 11

The term which is not related to the process of evolution of leaf is:

NUMS 2020
Biology
Kingdom Plantae
Elimination Tool:

A) Overtopping

B) Planation

C) Heterospory

D) Fusion / webbing

57 / 100

Category: Biology Ch 9 Class 12

DNA analysis is done to

Diagnose viral infections

Identify criminals

Determine evolution

All of these

58 / 100

Category: Biology Ch 11 Class 11

NAD is an example of ______:

NUMS 2020
Biology
Bioenergetics
Elimination Tool:

A) Mononucleotide

B) Dinucleotide

C) Tri nucleotide

D) Tetra nucleotide

59 / 100

Category: Biology Ch 6 Class 11

Rod-shaped bacteria are known as _______

UHS 2018
Biology
Kingdom Prokaryote
Elimination Tool:

A) Spirilla

B) Bacilli

C) Spirochete

D) Cocci

60 / 100

Category: Biology Ch 8 Class 12

Linked genes with closer loci ______ Mendel’s law of independent assortment as they _____ assort independently.

NUMS 2019 Reconduct
Biology
Variation and Genetics
Elimination Tool:

A) Don’t obey: cannot

B) Don’t obey: can

C) obey : cannot

D) obey : can

61 / 100

Category: Biology

Q.7 The thalamus and the hypothalamus are located in which region of the brain?

A. brain stem

B. cerebrum

C. cerebellum

D. Diencephalon

62 / 100

Category: Biology Ch 10 Class 11

Opposable thumbs are characteristic features of

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Lagomorpha

B) Primates

C) Ederitate

D) None of these

63 / 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

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 Ch 9 Class 11

Thick, waxy & leathery cuticle around leaves is present in which of the following?

PMC Sample 3
Biology
Kingdom Plantae
Elimination Tool:

A) Hydrophytes

B) Mesophytes

D) Xerophytes

C) Halophytes

66 / 100

Category: Biology Ch 2 Class 11

According to the fluid mosaic model of cell membrane, which zone is embedded inside?

PMC 2020
Biology
Biological Molecules
Elimination Tool:

A) Hydrophobic

B) Hydrophilic

C) Globular

D) Filamentous

67 / 100

Category: Biology Ch 5 Class 12

Lateral meristems are present in

All plants

Gymnosperms and dicots

Monocots

In aquatic plants

68 / 100

Category: Biology

NAD is an example of:

NUMS Mock 1
Biology
Biological Molecules

A) Mononucleotide

B) Dinucleotide

C) Trinucleotide

D) Tetranucleotide

69 / 100

Category: Biology Ch 8 Class 12

A pure breeding tall plant was crossed to dwarf plant. What would be probability of “Tt” genotype in F2

0.25

0.5

0.75

70 / 100

Category: Biology Ch 9 Class 12

The genetically engineered vaccine is available for which of the following hepatitis virus?

PMC Practice 5
Biology
Biotechnology
Elimination Tool:

A) HBV

B) HAV

C) HCV

D) Options A and B are correct

71 / 100

Category: Biology Ch 5 Class 12

Fetus is human embryo from the beginning of which of the following?

PMC Sample 2
Biology
Growth and Development
Elimination Tool:

A) 2nd month

B) 3rd month

D) 5th month

C) 4th month

72 / 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

73 / 100

Category: Biology

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

A. Leaf

B.Stems

C. Roots

D. Branches

74 / 100

Category: Biology Ch 6 Class 12

Transcription is the process in which an RNA copy of the DNA sequence and coding the gene is produced with the help of an enzyme called:

PMC 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) DNA polymerase

B) RNA polymerase

C) DNA transcriptase

D) RNA transcriptase

75 / 100

Category: Biology

Q.5 Evaporation of water from aerial parts of plants is called:

A. ascent ofI Sap

B. deplasmolysis

C. deplasmolysis

D. none of these

76 / 100

Category: Biology Ch 4 Class 11

A group of ribosomes attached to mRNA is known as

Polymer

Polypeptide

Polysomes

Monomer

77 / 100

Category: Biology Ch 10 Class 12

Adaptation of traits to better fill a niche is known as which of the following?

PMC Sample 3
Biology
Evolution
Elimination Tool:

A) polymorphism

B) gene linkage

C) specialization

D) replication

78 / 100

Category: Biology Ch 3 Class 11

The optimum pH of catalase is:

NUMS 2018
Biology
Enzymes
Elimination Tool:

A) Slightly alkaline

B) Highly acidic

C) Highly alkaline

D) Slightly acidic

79 / 100

Category: Biology Ch 5 Class 12

Thymus is found in the human body in _____.

PMC Practice 2
Biology
Growth and Development
Elimination Tool:

A) The medulla oblongata

B) The mediastinum of the upper thorax

C) Both Options A and B are correct

D) None of these options is correct

80 / 100

Category: Biology

Q.2 The set of all genes in any population is termed as?

A. population pool

B. species pool

C. gene pool

D. all of these

81 / 100

Category: Biology Ch 9 Class 12

Liposomes have/are:

PMC 2021 Tested
Biology
Biotechnology
Elimination Tool:

A) Fluid in center

B) Lipid bilayer

C) All of these

D) Carrier for drugs

82 / 100

Category: Biology Ch 3 Class 12

At the induction of action potential opening of Na+ gate with influx of Na+ is a _________ processes:

Active transport

Passive transport.

Diffusion

none of these.

83 / 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

84 / 100

Category: Biology Ch 9 Class 12

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

85 / 100

Category: Biology Ch 3 Class 11

Which of the following factors affect enzyme activity?

NTS 2011
Biology
Enzymes
Elimination Tool:

A) Temperature

B) pH

C) Concentration of substrate

D) Radiation

E) All of these

86 / 100

Category: Biology Ch 7 Class 12

Which is a feature of malignant tumor?

Localized

Little deleterious effect

Few mitosis

Metastasize

87 / 100

Category: Biology Ch 11 Class 11

Which of the following light is least absorbed by the plants:

Orange

Red

Blue

Green

88 / 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

89 / 100

Category: Biology

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

A. NADH

B. Cytochrome a3

C. Water

D. Oxygen

90 / 100

Category: Biology

Q.53 In case of snake bite, the most appropriate strategy to provide immunity would be:

A. Actively induced immunity

B. Artificial passive immunity

C. Naturally induced immunity

D. Auto immunity

91 / 100

Category: Biology

Q.39 Which of the following genetic diseases is caused by mutations in a membrane protein?

A. Alzheimer's disease

B. Parkinson's disease

C. Anemia

D. Hemolytic anemia

92 / 100

Category: Biology Ch 7 Class 11

Which of the following results from conjugation in paramecium?

PMC Practice 3
Biology
Kingdom Protista
Elimination Tool:

A) Cell death

B) Cell division

C) Budding

D) Recombination

93 / 100

Category: Biology

Q.63 Which hormone is produced mainly by corpus luteum in she ovary following ovulation?

A. Progesterone

B. FSH

C.LH

D. Chorionic gonadotrophic hormone

94 / 100

Category: Biology Ch 6 Class 11

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

Capsule

Slime

Cell Wall

Cell membrane

95 / 100

Category: Biology Ch 9 Class 12

A technique in transgenic animals in which desired gene is inserted into the eggs of animal is called:

UHS 2015
Biology
Biotechnology
Elimination Tool:

A) Embryonic Stem Cell mediated Transfer

B) Microinjection

C) Retro-virus mediated gene Transfer

D) Virus vectors

96 / 100

Category: Biology Ch 6 Class 12

Which statement correctly describes the transcription of DNA?

PMC 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) It produces amino acids

B) It produces messenger RNA

C) It results in increased DNA synthesis

D) It is a semi conservative process

97 / 100

Category: Biology Ch 5 Class 11

Which one of the following is NOT a mode of transmission of AIDS?

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

A) Through unsterilized needles

B) Through contact with open wounds

D) Through holding hands

C) Through blood transfusion

98 / 100

Category: Biology Ch 13 Class 12

Total area of the world under cultivation is

11%

21%

31%

99 / 100

Category: Biology Ch 4 Class 12

Follicle – stimulating hormone, which is produced by the pituitary gland, stimulates the ovaries to produce:

NUMS 2019 Cancelled
Biology
Reproduction
Elimination Tool:

A) Estrogen

B) Estrogen and progesterone

C) Progesterone

D) Oxytocin

100 / 100

Category: Biology Ch 7 Class 11

Radiolarians belong to which of the following protozoal group?

Zooflagellates

Actinopods

Foraminifera

Apicomplexans

Your score is

The average score is 59%

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