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 4 Class 11

Strengthening material of prokaryotic cell wall is

Cellulose

Chitin

Inorganic salts silica waxes and ligin

Peptidoglycan or Murein.

2 / 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

3 / 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

4 / 100

Category: Biology

They serve as a scaffold for formation of higher order chromatin structure:

NUMS Mock 2
Biology
Cell Structure and Function

A) Nucleosome

B) Nucleus

C) Chromosomes

D) Histones

5 / 100

Category: Biology Ch 11 Class 11

Molecular formula of chlorophyll ‘a’ molecule is:

C55H72O5N4Mg

C55H70O6N4Mg

C50H72O6N4Mg

C55H70O5N4Mg

6 / 100

Category: Biology

As an excretory organ, liver:

NUMS Mock 3
Biology
Homeostasis

A) Detoxifies many chemical poisons

B) Produces ammonia for excretion by the kidneys

C) Produces urea and uric acids from the nitrogen of amino acids

D) All of the above

7 / 100

Category: Biology Ch 8 Class 12

Baldness is most frequent in

Men

Women

Children

Girls

8 / 100

Category: Biology

Q.51 The heavy and light chains of an antibody molecule is held together by:

A. H-bonds

B. Disulphide bridges

C. Ionic interactions

D. Hydrophobic interactions

9 / 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

10 / 100

Category: Biology

Q.60 The part of spinal cord where interneurons present is called:

A. White matter

B. Gray mater

C. lumbar enlargement

D. cervical enlargement

11 / 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

12 / 100

Category: Biology

Enzymes work by lowering the ______ of the reactions they catalyse:

NUMS Mock 4
Biology
Enzymes

A) Kinetic energy

B) Activation energy

C) Heat energy

D) Potential energy

13 / 100

Category: Biology Ch 3 Class 12

Which one of the following is a neurotransmitter?

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) Dopamine

B) Hydrochloric acid

C) Sodium ions

D) Calcium ions

14 / 100

Category: Biology Ch 12 Class 11

Digestion of which food components starts from the oral cavity?

NUMS 2020
Biology
Nutrition
Elimination Tool:

A) Proteins

B) Fats

D) Vitamins

C) Carbohydrates

15 / 100

Category: Biology Ch 9 Class 11

Gymnosperms are referred to as “naked seeded plants”, because

NUMS 2016
Biology
Kingdom Plantae
Elimination Tool:

A) They lack ovule

B) They lack ovaries

C) The embryo is unprotected

D) They have no seed coat

16 / 100

Category: Biology Ch 1 Class 12

An increrase in plant girth due to activity of _____ is called secondary growth.

Cork cambium

Pith

Vascular cambium

Both a and c

17 / 100

Category: Biology Ch 6 Class 11

Which of the following statement is incorrect regarding germ theory of diseases postulated by Robert Koch?

A specific organism can always be found in association with a given disease

The organism can be isolated and grown in pure culture in the laboratories

The pure culture cannot produce the disease when inoculated into susceptible animal however the causative organism isolated from pure culture can do so.

It is possible to recover the organism in pure culture from the experimentally infected animals.

18 / 100

Category: Biology

Q.33 The researcher notices that round seeds occur maturely in the environment.Based solely on this information, what can there searcher conclude about the round phenotype?

A. It is dominant

B. It is recessive

C. It is wild type

D. Both a and b

19 / 100

Category: Biology Ch 5 Class 11

Which of the following is the simplest form of pathogens causing diseases?

NTS 2018
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Viruses

B) Prions

C) Fungus

D) Amoeba

20 / 100

Category: Biology Ch 5 Class 11

The viruses are:

NTS 2011
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Cellular

B) Prokaryotes

C) Non-cellular

D) Eukaryotes

21 / 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

22 / 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

23 / 100

Category: Biology Ch 9 Class 11

What is the strengthening material of the prokaryotic cell wall?

PMC Practice 7
Biology
Kingdom Plantae
Elimination Tool:

A) Cellulose

B) Chitin

C) Silica waxes and lignin

D) Peptidoglycan or murein

24 / 100

Category: Biology Ch 5 Class 12

The disease that arises due to increasing age is:

NTS 2018
Biology
Growth and Development
Elimination Tool:

A) Alzheimer's

B) Hepatitis C

C) Cholera

D) Malaria

25 / 100

Category: Biology Ch 10 Class 11

Archaeopteryx is a transitional stage between the members of which one of the following pairs?

NTS 2013
Biology
Kingdom Animalia
Elimination Tool:

A) Amphibian … bird

B) Fish … amphibian

C) Reptile … mammal

D) Reptile … bird

26 / 100

Category: Biology Ch 10 Class 12

The wings of birds and the forelegs of a horse are _____ structures.

NUMS 2016
Biology
Evolution
Elimination Tool:

A) Analogous

B) Homologous

C) Vestigial

D) Evolutionary convergent

27 / 100

Category: Biology Ch 12 Class 11

Deficiency of K+ causes:

Stunted growth & strong chlorosis

No electron transport chains

Premature death of leaves.

Stunted growth of roots.

28 / 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

29 / 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

30 / 100

Category: Biology Ch 10 Class 11

Which one of the following animals possesses an open circulatory system:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Amoeba

B) Earthworm

C) Grasshopper

D) Man

31 / 100

Category: Biology Ch 5 Class 12

The most abundant organic molecule on the planet earth is:

NUMS 2016
Biology
Growth and Development
Elimination Tool:

A) Starch

B) Glycogen

C) Glucose

D) Cellulose

32 / 100

Category: Biology Ch 2 Class 11

The disease caused by nutritional deficiency is:

NTS 2018
Biology
Biological Molecules
Elimination Tool:

A) Hepatitis

B) Cholera

C) Malaria

D) Beriberi

33 / 100

Category: Biology Ch 10 Class 11

The fate of each blastomere is foretold. The cleavage will be as

Spiral and indeterminate

Radial and indeterminate

Spiral and determinate

34 / 100

Category: Biology

Most enzymes have an optimum temperature of around:

NUMS Mock 4
Biology
Enzymes

A) 30 C

B) 40 C

C) 50 C

D) 20 C

35 / 100

Category: Biology Ch 3 Class 12

Which of the following is used in brewing industry to promote malting:

Gibberellins

Cytokinins

Auxins

Abscisic Acid

36 / 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

37 / 100

Category: Biology Ch 10 Class 12

Most fossils are found in the

Metamorphic rocks

Soil

Sedimentary rocks

Volcanic mountains

38 / 100

Category: Biology Ch 9 Class 12

The DNA that has been altered and which now contains length of nucleotides from two different organisms is called a:

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) Plasmid

B) Combined DNA

C) Vector

D) Recombinant DNA

39 / 100

Category: Biology Ch 3 Class 12

The nerve center for sight is located in the

NUMS 2014
Biology
Coordination and Control
Elimination Tool:

A) Thalamus

B) Myopic

C) Both a and b

D) None of these

40 / 100

Category: Biology Ch 11 Class 11

1 NADH in respiratory chain produces:

NUMS 2015
Biology
Bioenergetics
Elimination Tool:

A) 1 ATP

B) 2 ATP

C) 3 ATP

D) 4 ATP

41 / 100

Category: Biology

The scientific name of thorn Apple is?

NUMS Mock 2
Biology
Kingdom Plantae

A) Sycopodium phlogmaria

B) Anthocoros fusiform

C) Ginkgo biloba

D) Datura alba

42 / 100

Category: Biology Ch 12 Class 11

Useful bacteria at the large intestine of humans produce:

NUMS 2015
Biology
Nutrition
Elimination Tool:

A) Vitamin K

B) Vitamin E

C) Vitamin D

D) Vitamin C

43 / 100

Category: Biology Ch 1 Class 12

In a hot summer after noon, if your body’s Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of

Positive feed back

Negative feed back

. Feed back

Osmoregulation

44 / 100

Category: Biology

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

A. NADH

B. Cytochrome a3

C. Water

D. Oxygen

45 / 100

Category: Biology Ch 6 Class 11

Who coined the term Animalcules for microorganisms like Bacteria and protozoa?

Robert Koch

Louis Pasteur

Alexander Fleming

Leeuwenhoek

46 / 100

Category: Biology Ch 6 Class 11

The presence of peptidoglycan in gram-positive bacteria is:

PMC Practice 3
Biology
Kingdom Prokaryote
Elimination Tool:

A) 40% of dry weight

B) 50% of dry weight

D) 80% of dry weight

C) 10% of dry weight

47 / 100

Category: Biology Ch 11 Class 11

Exposure to ______ light is effective in photosynthesis as it enables guard cells to take up K+ and open the stomata.

NUMS 2015
Biology
Bioenergetics
Elimination Tool:

A) Red

B) Blue

C) Green

D) Orange

48 / 100

Category: Biology Ch 5 Class 11

Mark the one Kingdom having the most conspicuous living organisms?

NTS 2018
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Monera

B) Protista

C) Animalia

D) Plantae

49 / 100

Category: Biology

Q.10 Mating between relatives is called which of the following?

A. Ex breeding

B. Breeding

C. Inbreeding

D. Outbreeding

50 / 100

Category: Biology Ch 14 Class 11

The valve between right atrium and right ventricle is called:

NUMS 2014
Biology
Transport
Elimination Tool:

A) Bicuspid valve

B) Tricuspid valve

C) Pulmonary valve

D) Semi lunar valve

51 / 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

52 / 100

Category: Biology Ch 4 Class 11

Which of the following are related to the synthesis of excretory protein by the cell?

NUMS 2019 Cancelled
Biology
Cell Structure and Function
Elimination Tool:

A) Cell membranes

B) Rough Endoplasmic Reticulum

C) Smooth Endoplasmic Reticulum

D) Centrioles

53 / 100

Category: Biology

Which of the following animals can survive without drinking water?

NUMS Mock 4
Biology
Nutrition

A) Kangaroo rat

B) Pig

C) Kangaroo

D) Camel

54 / 100

Category: Biology Ch 7 Class 11

Cyanobacteria resemble photosynthetic eukaryotes because they have:

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) PS-I

B) None of these

C) PS-I and PS-II both

D) PS-II

55 / 100

Category: Biology

Cardiac output is increased by all of the following EXCEPT:

NUMS Mock 2
Biology
Transport

A) Hypoxia

B) Exercise

C) Sleep

D) Pregnancy

56 / 100

Category: Biology Ch 10 Class 12

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

Genus

Family

Species

Community

57 / 100

Category: Biology Ch 10 Class 12

Analogous organs show

Convergent evolution

Divergent evolution

Straight evolution

Zig-zag evolution

58 / 100

Category: Biology

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?

NUMS Mock 2
Biology
Gaseous Exchange

A) Plant B

B) Plant D

C) Plant A

D) Plant C

59 / 100

Category: Biology Ch 11 Class 11

The process by which one molecule of Glucose splits up into molecules of Pyruvate is called:

NTS 2018
Biology
Bioenergetics
Elimination Tool:

A) Glycolysis

B) Oxidative Phospholyration

C) Electron Transport Chain

D) Kreb's Cycle

60 / 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

61 / 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

62 / 100

Category: Biology Ch 13 Class 12

In air % of oxygen and carbon dioxide is

Oxygen 20%, CO2 0.03%

Oxygen 50%, CO2 50%

Oxygen 30%, CO2 0.05%

Oxygen 25%, CO2 0.02%

63 / 100

Category: Biology

Q.2 Prokaryotic and eukaryotic cells generally have which of the following features in common?

A. Cell wall made of cellulose

B. Presence of linear chromosome

C. Presence of ribosomes

D. Presence of nucleus

64 / 100

Category: Biology Ch 6 Class 11

Under the microscope, the bacteria appear a bluish-purple color. Which class of bacteria are on the slide?

PMC Practice 5
Biology
Kingdom Prokaryote
Elimination Tool:

A) Helix

B) Around

C) Rod

D) Rigid helix

65 / 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

66 / 100

Category: Biology

Nitrogen-cycle is facilitated by ______.

NUMS Mock 3
Biology
Ecosystem

A) Algae

B) Fungi

C) Bacteria

D) Virus

67 / 100

Category: Biology Ch 10 Class 11

Leptocardii is a group of:

NUMS 2015
Biology
Kingdom Animalia
Elimination Tool:

A) Urochordata

B) Cephalochordata

C) Vertebrata

D) Mollusca

68 / 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

69 / 100

Category: Biology Ch 8 Class 12

Which statement about dominant and recessive alleles is not correct?

NTS 2016 SMBBMC
Biology
Variation and Genetics
Elimination Tool:

A) A dominant characteristic is seen in the phenotype of a heterozygote.

B) A homozygous genotype may be either dominant or recessive.

C) Recessive phenotypes always have two recessive alleles.

D) The phenotype of a homozygote is always dominant.

70 / 100

Category: Biology Ch 7 Class 12

How does the second meiotic division differ from mitosis? In the second meiotic division:

NTS 2015 SMBBMC
Biology
Cell Cycle
Elimination Tool:

A) Chiasmata Formed between the chromatids of a bivalent

B) Each chromosome replicates to form two chromatids during metaphase

C) The separating chromatids of a pair differ genetically

D) None of the above

71 / 100

Category: Biology Ch 13 Class 11

Number of spiracles present in the thorax of cockroach is

72 / 100

Category: Biology

Consider the following statements about biological communities.

I. Their members share a common gene pool

II. The community remains stable even though some physical aspect of the environment may undergo a change

III. It consists of all the populations living in a particular area.

IV. A community interacts with a non-living environment and both function together to form an ecosystem

Which two of the above statements are true?

NUMS Mock 4
Biology
Evolution

A) 1 and 2

B) 1 and 3

C) 2 and 4

D) 3 and 4

73 / 100

Category: Biology Ch 5 Class 11

Which of the Euglenas (a Protoctista) character resembles that of animals:

They can move

They lack cell wall

They do not have chlorophyll

Both a and b

74 / 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

75 / 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

76 / 100

Category: Biology Ch 10 Class 11

Amphibians live on:

NUMS 2016
Biology
Kingdom Animalia
Elimination Tool:

A) Water

B) Water and land

C) Land

D) Air

77 / 100

Category: Biology Ch 1 Class 12

The only possible treatment in end stage renal failure is:

NUMS 2018
Biology
Homeostasis
Elimination Tool:

A) Hemodialysis

B) Peritoneal dialysis

C) Lithotripsy

D) Kidney transplantation

78 / 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

79 / 100

Category: Biology Ch 4 Class 12

Which of these cycles operate in human females?

PMC Sample 2
Biology
Reproduction
Elimination Tool:

A) Oestrous cycle

B) Menstrual cycle

C) Both Options A and B are correct

D) None of these options is correct

80 / 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

81 / 100

Category: Biology Ch 7 Class 12

Feature of cancer cells in common?

High nucleus to cytoplasmic ratio

Prominent nucleoli

Many mitosis

All of these

82 / 100

Category: Biology Ch 1 Class 12

Which of the following substances helps to concentrate urine?

NUMS 2020
Biology
Homeostasis
Elimination Tool:

A) Aldosterone

B) ADH

C) Glucosterone

D) Thyroxin

83 / 100

Category: Biology Ch 6 Class 11

Flagella originate from

Cell membrane

Cell wall

Capsule

Basal body

84 / 100

Category: Biology Ch 13 Class 11

Carbon dioxide is carried in the blood, mainly as:

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) Sodium bicarbonate

B) Potassium bicarbonate

C) Carbamino-haemoglobin

D) Dissolved gas in plasma

85 / 100

Category: Biology Ch 7 Class 12

Which statement is not true about phragmoplast?

Formed from vesicle originating from Golgi apparatus

Present in plants only

Formed at the end of anaphase

Centre of dividing cell

86 / 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

87 / 100

Category: Biology Ch 5 Class 11

HIV is a:

NUMS 2018
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Virus

B) Prions

C) Viroid

D) Venom

88 / 100

Category: Biology Ch 1 Class 11

A large regional community primarily determined by climate is called :

Population

Community

Biome

Habitat

89 / 100

Category: Biology

Q.12 The least stable RNA present in the cell is:

tRNA

mRNA

rRNA

Micro RNA

90 / 100

Category: Biology Ch 2 Class 12

Muscle fiber has many _____ and in turns these have many ______.

NUMS 2019 Reconduct
Biology
Support and Movement
Elimination Tool:

A) Myofibrils; sarcomeres

B) Myofibrils; thin filaments

C) Myosin; thin filaments

D) Myosin; sarcomeres

91 / 100

Category: Biology Ch 7 Class 11

Bacteria that live in intestine and produce vitamin K belong to?

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) Vibrio

B) Cocci

C) Spirilla

D) Bacilli

92 / 100

Category: Biology Ch 4 Class 12

The sexually transmitted disease, that can affect both the male and the female genitals and may damage the eyes of babies born of infected mothers is:

PMC Sample 1
Biology
Reproduction
Elimination Tool:

A) AIDS

B) Hepatitis

C) Gonorrhoea

D) All of these

93 / 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

94 / 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

95 / 100

Category: Biology Ch 14 Class 11

Antibodies are actually:

NUMS 2016
Biology
Transport
Elimination Tool:

A) Globular proteins

B) Glycoproteins

C) Fibrous proteins

D) Glycolipids

96 / 100

Category: Biology Ch 13 Class 11

______ respiration is the process by which cell utilized oxygen and produces CO2

Cellular

Organismic

Both of these

None of these

97 / 100

Category: Biology Ch 2 Class 12

Which one of the following forms the blk of exoskeleton of an arthropod?

Epicuticle

Procuticle

Ectocuticle

None of these

98 / 100

Category: Biology Ch 13 Class 11

The air spaces may comprise upto ______ of total volume of leaf surface.

30%

20%

40%

50%

99 / 100

Category: Biology Ch 13 Class 12

Conversion of ammonium into nitrates is:

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Nitrification

B) Nitrogen Fixation

C) Ammonification

D) Denitrification

100 / 100

Category: Biology Ch 1 Class 12

The condition of a stable internal environment in an organism is:

NTS 2015 SMBBMC
Biology
Homeostasis
Elimination Tool:

A) Coordination

B) Organisation

C) Homeostasis

D) Integration

Your score is

The average score is 61%

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