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 7 Class 11

It is the smallest eukaryote:

NUMS 2017
Biology
Kingdom Protista
Elimination Tool:

A) Virus

B) Bacteria

C) Plasmodium

D) Sponge

2 / 100

Category: Biology Ch 13 Class 12

Driving force for all the cycles in ecosystem is

Water

Soil

Sun

Air

3 / 100

Category: Biology Ch 13 Class 12

In nitrogen fixation, nitrogen is converted to:

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Nitrate ions and ammonia

B) Atomic nitrogen

C) Urea

D) All of these

4 / 100

Category: Biology

The number and sequence of amino acids along a polypeptide chain is called _______ structure of a protein.

NUMS Mock 2
Biology
Biological Molecules

A) Quaternary

B) Tertiary

C) Primary

D) Secondary

5 / 100

Category: Biology Ch 9 Class 12

Choose the term from the following which is NOT a part of gene therapy?

NTS 2019
Biology
Biotechnology
Elimination Tool:

A) Bone marrow transplant

B) Retrovirus

C) DNA Fingerprinting

D) Somatic cells

6 / 100

Category: Biology

Q.11 Which of the following statement regarding lecithin is correct?

A. Contain only one fatty acid

B. Choline attached with phosphatidic acid at carbon 3

C. Phosphate group is positively charged

D. Have five carbon glycerol molecules

7 / 100

Category: Biology

Icosahedral viruses have how many faces?

NUMS Mock 4
Biology
Variety of Life

A) 20

B) 30

C) 10

D) 40

8 / 100

Category: Biology Ch 4 Class 11

Which of the following is NOT the function of cell membranes?

NTS 2018
Biology
Cell Structure and Function
Elimination Tool:

A) Protection of cytoplasm

B) Regulating the passage of different molecules

C) Protein synthesis

D) Cellular communication

9 / 100

Category: Biology Ch 2 Class 11

A complex substance which on hydrolysis yields polyhydroxy aldehyde or ketone subunits is called:

Lipid

Carbohydrate

Protein

Carotein

10 / 100

Category: Biology Ch 14 Class 11

The only vein in human carrying oxygenated blood is:

PMC 2020
Biology
Transport
Elimination Tool:

A) Femoral

B) Pulmonary

C) Real

D) Iliac

11 / 100

Category: Biology

The gene which controls the ABO group has how many alleles in an individual?

NUMS Mock 3
Biology
Variation and Genetics

A) 1.

B) 2.

C) 3.

D) 4.

12 / 100

Category: Biology Ch 2 Class 12

When a physician elicits the knee-jerk reflex by tapping deep tendons in the knee, the normal response is for the lower leg to swing forward. When this happens:

NTS 2013
Biology
Support and Movement
Elimination Tool:

A) Muscles in the front of the thigh are contracting and muscles in the back of the thigh are relaxing

B) Muscles in the front of the lower leg are contracting and muscles in the back of the lower leg are relaxing

C) Muscles in the back of the thigh are contracting and muscles in the front of the thigh are relaxing

D) Muscles in the back of the lower leg are contracting and muscles in the front of the lower leg are relaxing

13 / 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

14 / 100

Category: Biology Ch 3 Class 12

The autonomic nervous system controls all of the following activities except:

NTS 2014
Biology
Coordination and Control
Elimination Tool:

A) Digestion of food

B) Heart beat

C) Contraction of pupil of eye

D) Thought

15 / 100

Category: Biology Ch 6 Class 11

Coccobacillus has a shape similar to

Diplobacillus

Sarcina

Egg

None of these

16 / 100

Category: Biology

Q.2 Competitive inhibition can be overcome by using

A. Low concentration of substrate

B. High concentration of inhibitor

C. Moderate concentration of inhibitor

D. High concentration of substrate

17 / 100

Category: Biology Ch 12 Class 11

Strong chlorosis is due to the deficiency of _____ in plants.

Magnesium

Nitrogen

Potassium

Phosphorus

18 / 100

Category: Biology Ch 8 Class 12

How many genes control Rh blood group system?

One

Two

Three

Four

19 / 100

Category: Biology Ch 5 Class 12

Growth process is

Irreversible

Reversible

Sometimes reversible sometimes irreversible

Temporary

20 / 100

Category: Biology Ch 3 Class 11

The type of energy, reduced by the enzymes, for biological reactions to occur is called the:

UHS 2019
Biology
Enzymes
Elimination Tool:

A) Light Energy

B) Heat energy

C) Active energy

D) Activation energy

21 / 100

Category: Biology Ch 7 Class 11

The feeding stage of slime mold is a

UHS 2010
Biology
Kingdom Protista
Elimination Tool:

A) Gastrozoid

B) Sporozoite

C) Plasmodium

D) Merozote

22 / 100

Category: Biology

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

A. 1918

B. 1917

C. 1920

D. 1990

23 / 100

Category: Biology Ch 12 Class 11

Milk drinking babies have an additional enzyme called:

NUMS 2016
Biology
Nutrition
Elimination Tool:

A) Rennin

B) Amylase

C) Lipase

D) None of these options are correct

24 / 100

Category: Biology Ch 3 Class 11

Which of the following statements is incorrect?

PMC Sample 1
Biology
Enzymes
Elimination Tool:

A) The competitive inhibitor affects the rate of breakdown of the enzyme-substrate complex.

B) The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate.

C) A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor complex.

D) In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

25 / 100

Category: Biology

Q.46 Which part of the brain connects the cerebrum with the spinal cord?

A. Forebrain

B. Cerebrum

C. Cerebellum

D. Brainstem

26 / 100

Category: Biology

Q.61 Herbivores always occupy :

A. T1

B. T3

C. T2

D. T4

27 / 100

Category: Biology Ch 1 Class 12

Thick, waxy & leathery cuticle around leaves is present in

Hydrophytes

Mesophytes

Xerophytes

Halophytes

28 / 100

Category: Biology Ch 6 Class 12

Within the chromosomes, each chromatid contains ______ DNA molecule:

NUMS 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) One

B) Two

C) Three

D) Half

29 / 100

Category: Biology Ch 7 Class 11

Kingdom protista includes ______ phyla

30 / 100

Category: Biology

Q.16 Retroviruses have a special enzyme ‘reverse transcriptase’ which can convert ____________into ___________.

A. DNA to DNA

B. RNA to DNA

C. DNA to RNA

D. RNA to RNA

31 / 100

Category: Biology

Q.55 The type of bronchitis that causes no permanent damage to the lungs and lasts for two weeks is known as

A. Acute bronchitis

B. Chronic bronchitis

C. Coastal bronchitis

D. Intercostal bronchitis

32 / 100

Category: Biology Ch 5 Class 12

Which of the following is not related to apoptosis?

NUMS 2015
Biology
Growth and Development
Elimination Tool:

A) Loss of tail of developing humans embryos

B) Loss of tissues between developing digits

C) Controlling the number of neurons

D) None of the given options

33 / 100

Category: Biology Ch 3 Class 11

Which of the following statements about enzymes is false?

PMC Sample 1
Biology
Enzymes
Elimination Tool:

A) The Keq of a reaction remains unchanged in the presence of an enzyme

B) Enzymes speed up the rate of reaction in DNA synthesis

C) Harsh, acidic conditions can completely denature an enzyme

D) An enzyme is completely converted to product during metabolism

34 / 100

Category: Biology Ch 10 Class 12

Which factor decides what type of variation should be flourished and passed on to the next generations?

NTS 2019
Biology
Evolution
Elimination Tool:

A) Species

B) Population

C) Survival

D) Environment

35 / 100

Category: Biology Ch 14 Class 11

Anti-bodies are produced by:

NUMS 2014
Biology
Transport
Elimination Tool:

A) Red blood cells

B) Platelets

C) B-lymphocytes

D) Hormones

36 / 100

Category: Biology

Q.6 The uterus of the female reproductive system opens into the?

A. placenta

B. birth canal

C. cervix

D. all of these

37 / 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

38 / 100

Category: Biology

Red-green color-blindness is an X-linked recessive disorder. Jacob’s paternal grandfather and father are both color-blind, but his mother has two normal alleles. What is the probability that Jacob is red-green color-blind?

NUMS Mock 2
Biology
Variation and Genetics

A) 0%

B) 25%

C) 50%

D) 75%

39 / 100

Category: Biology

Male and female sea urchins release their sperm and eggs into the water where fertilization takes place. How can their reproduction be described?

NUMS Mock 3
Biology
Reproduction

A) Asexual reproduction which results in genetically dissimilar offsprings

B) Asexual reproduction which results in genetically identical offsprings

C) Sexual reproduction which results in genetically dissimilar offsprings

D) Sexual reproduction which results in genetically identical offsprings

40 / 100

Category: Biology Ch 5 Class 11

The size of smallest virus is:

10 nm

20 nm

30 nm

40 nm

41 / 100

Category: Biology Ch 5 Class 11

Which of the following are composed of proteins only which contain the information that codes for their own replication?

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

A) Virus

B) Virion

C) Prions

D) Capsule

42 / 100

Category: Biology Ch 2 Class 11

Lipids store double the amount of energy as compared to carbohydrates because of:

PMC 2020
Biology
Biological Molecules
Elimination Tool:

A) High proportion of oxygen

B) High C-O ratio

C) Low proportion of Carbon

D) High proportion of C-H

43 / 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

44 / 100

Category: Biology Ch 6 Class 12

“Law of independent assortment” states:

PMC 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) That each pair of alleles assort independently of other pairs of alleles during gamete formation

B) That alleles of each pair of contrasting trait have unequal probability to assort with the alleles of other pair

C) That the two coexisting alleles for each trait segregate (separate) from each other at meiosis so that each gamete receives only one of the two alleles

D) That pertain to inheritance of single trait (monohybrid cross)

45 / 100

Category: Biology Ch 4 Class 11

Which of the following offers an active barrier between the cell content and their environment by allowing only selective substances to pass through it?

NUMS 2019 Reconduct
Biology
Cell Structure and Function
Elimination Tool:

A) Cell wall

B) Plasma membrane

C) Nuclear membrane

D) Vacuole

46 / 100

Category: Biology Ch 2 Class 11

Which of the following has the ability to develop ester linkage with the OH group of Pentose sugar?

NUMS 2015
Biology
Biological Molecules
Elimination Tool:

A) Purine

B) Pyrimidine

C) H3PO4

D) HNO3

47 / 100

Category: Biology Ch 2 Class 11

Ribosomes are composed of almost an equal amount of:

NUMS 2018
Biology
Biological Molecules
Elimination Tool:

A) Protein & Lipid

B) Protein & RNA

C) RNA & Lipid

D) RNA & Carbohydrates

48 / 100

Category: Biology Ch 4 Class 11

Which one of the following combinations is NOT the part of an animal cell?

NUMS 2019 Reconduct
Biology
Cell Structure and Function
Elimination Tool:

A) Central vacuole, Cell Membrane, Ribosomes

B) Chloroplast, Ribosome , Mitochondrion

C) Cell wall, Chloroplast, Central vacuole

D) Ribosome, Mitochondrion, Cell wall

49 / 100

Category: Biology Ch 9 Class 11

Which of the following is not a parasitic fungus of plants?

NUMS 2015
Biology
Kingdom Plantae
Elimination Tool:

A) Rust

B) Mildews

C) Armillaria

D) None of the given options

50 / 100

Category: Biology Ch 12 Class 11

Percentage of magnesium by mass in a human being is:

NUMS 2015
Biology
Nutrition
Elimination Tool:

A) 0.005%

B) 0.25%

C) 0.15%

D) 0.35%

51 / 100

Category: Biology Ch 8 Class 12

In birds the male is the homogametic sex. A male bird showing the recessive trait was mated with a female showing the dominant trait of a characteristic governed by a pair of alleles which are sex-linked. What is the probability that the male offspring will show the dominant trait?

NTS 2014
Biology
Variation and Genetics
Elimination Tool:

A) 0

B) 0.25

C) 0.50

E) 1.00

52 / 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

53 / 100

Category: Biology Ch 5 Class 11

These viruses usually occur in two structural forms:

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

A) HIV

B) HCV

C) Bacteriophage

D) COVID-19

54 / 100

Category: Biology Ch 3 Class 11

Most enzymes have an optimum temperature of around:

PMC 2020
Biology
Enzymes
Elimination Tool:

A) 30 C

B) 40 C

C) 50 C

D) 20 C

55 / 100

Category: Biology Ch 13 Class 11

Oxygen contents per liter of air is

10 ml

100 ml

200 ml

100ml

56 / 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

57 / 100

Category: Biology Ch 14 Class 11

In the human body, blood circulating from the gut to the heart passes through the:

NTS 2013
Biology
Transport
Elimination Tool:

A) aorta

B) kidneys

D) lungs

C) llver

58 / 100

Category: Biology Ch 4 Class 11

Tissue is a

PMC 2020
Biology
Cell Structure and Function
Elimination Tool:

A) group of cells

B) group of organs

C) group of tissues

D) group of organisms

59 / 100

Category: Biology

Q.20 Cytochromes are electron transport intermediates containing?

A. myoglobin

B. heam

C. globulin

D. fibrin

60 / 100

Category: Biology Ch 5 Class 12

he only promoter of Leaf’s senescence in the following plant hormones is:

PMC Practice 9
Biology
Coordination and Control
Growth and Development
Elimination Tool:

A) Gibberellins

B) Cytokinins

C) Auxins

D) Abscisic acid

61 / 100

Category: Biology

Q.53____________________are among smallest known virus

A. Picornavirus

B. Parvoviruses

C. Herpes virus

D. Rotavirus

62 / 100

Category: Biology

Q.28 The enzyme which plays important role in HIV pathogenesis

A. RNA polymerase I

B. DNA polymerase II

C. Reverse Transcriptase I

D. Reverse Transcriptase

63 / 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

64 / 100

Category: Biology Ch 7 Class 11

Lime stone deposits are formed from

Zooflagellates

Foraminferans

Aetinopods

Apicomplexans

65 / 100

Category: Biology Ch 7 Class 12

A special area of centromere with specific base arrangement and specific proteins where spindle fibers are attached is called

Chromatin

Aster

Kinetochore

Primary constriction

66 / 100

Category: Biology Ch 2 Class 11

Which one is an organic compound?

CO2

Water

Lipids

HCI

67 / 100

Category: Biology Ch 12 Class 11

In fatty liver the fat contents are:

NUMS 2014
Biology
Nutrition
Elimination Tool:

A) 1 to 2%

B) 4 to 5 %

C) 30 to 40%

D) 10 to 15%

68 / 100

Category: Biology Ch 8 Class 11

According to two kingdom classification fungi were placed in kingdom

Plantae

Animalia

Protista

Fungi

69 / 100

Category: Biology Ch 8 Class 11

Which one of the following is different from all the rest regarding the number of cells inits body?

Rusts

Mushrooms

Molds

Yeasts

70 / 100

Category: Biology Ch 5 Class 11

The name Bacteriophage was coined by:

Charles Chamberland

Ivanowski

Twort

D Herelle

71 / 100

Category: Biology Ch 2 Class 11

Cn(H2O)n. is a general formula of :

Monosaccharides

Oligosaccharides

Ploysacharides

72 / 100

Category: Biology Ch 5 Class 12

The fate of each blastomere is foretold. What will that cleavage be?

PMC Practice 9
Biology
Growth and Development
Elimination Tool:

A) Spiral and indeterminate

B) Radial and indeterminate

C) Radial and determinate

D) Spiral and determinate

73 / 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

74 / 100

Category: Biology Ch 3 Class 11

If we add more substrate to an already occurring enzymatic reaction and it has no affect on the rate of reaction, the process is called?

PMC Practice 2
Biology
Enzymes
Elimination Tool:

A) Denaturation

B) Saturation

C) Composition

D) Inhibition

75 / 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

76 / 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

77 / 100

Category: Biology

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

A. Flatworms

B. Triploblastic

C. Coelomates

D. Bilateral symmetry

78 / 100

Category: Biology Ch 12 Class 11

Puccinia is a parasitic:

Plant

Fungus

Animal

Algae

79 / 100

Category: Biology Ch 5 Class 12

Meristems are group of cells that

Allow the surrounding region to divide

Provide nutrition

. Help in movement

Retain the potential to divide

80 / 100

Category: Biology Ch 5 Class 11

Other name for Kingdom monera is:

Protoctista

Prokaryotae

Archae

None of these

81 / 100

Category: Biology Ch 3 Class 11

Optimal temperature of enzymes present in human body is

27?C

37?C

47?C

30?C

82 / 100

Category: Biology Ch 9 Class 12

Which of the following is the manipulation of genetic material for practical purposes?

NTS 2018
Biology
Biotechnology
Elimination Tool:

A) Grafting

B) Tissue Culture

C) Genetic Engineering

D) Cell Culture

83 / 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

84 / 100

Category: Biology

In the commercial manufacture of insulin, a human gene is inserted into which one of the following?

NUMS Mock 1
Biology
Biotechnology

A) A chromosome of a human cell

B) A protein molecule in a yeast cell

C) The DNA of a bacterium

D) The nucleic acid in a virus

85 / 100

Category: Biology Ch 2 Class 11

The bond formed when two or more atoms complete their electron shells by sharing electrons is called:

Ionic bond

Hydrogen bond

Covalent bond

Electrovalent bond

86 / 100

Category: Biology Ch 4 Class 11

Percentage of proteins in cell membrane is

20-40%

40-50%

60-80%

80-100%

87 / 100

Category: Biology

Q.22 What are T Cells and their rolelin IHV infection?

A. A type lymphocytes

B. Present in blood and work as detence systein

C.They kill the ioreign invader

D. All of these

88 / 100

Category: Biology Ch 4 Class 11

What is the role of cholesterol in the cell membrane?

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) it functions in joining adjacent cells together.

B) It functions in recognizing foreign cells.

C) It increases the rate of transport of ions across the membrane.

D) It stabilizes the cell membrane.

89 / 100

Category: Biology

Q.18 The internal buds are known as which of the following?

A. Spicules

B. Choanocytes

C. Gemmules

D. Both A and B

90 / 100

Category: Biology Ch 1 Class 11

The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called :

Environmental biology

Human biology

Both b and c

91 / 100

Category: Biology Ch 5 Class 12

Determinate growth is

. Growing continuously

Fluctuating growth

Grow to certain size and then stop

Vegetative roots and shoots grow by

92 / 100

Category: Biology Ch 10 Class 12

Which of the following concepts is attributed to Lamarck?

NUMS 2014
Biology
Evolution
Elimination Tool:

A) Struggle for existence

B) Survival of the fittest

C) Inheritance of acquired characters

D) Cells come from pre-existing cells

93 / 100

Category: Biology Ch 7 Class 11

The disease caused by Protozoal infection is:

NTS 2018
Biology
Kingdom Protista
Elimination Tool:

A) Rickets

B) Goiter

C) Malaria

D) Beri-beri

94 / 100

Category: Biology Ch 3 Class 11

Reversible inhibitors form WEAK linkages with which of the following?

PMC Sample 3
Biology
Enzymes
Elimination Tool:

A) enzyme

B) reactant

C) product

D) substrate

95 / 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

96 / 100

Category: Biology Ch 6 Class 12

Who discovered DNA?

P.A.Levene

Frederick Griffith

Friedrich Miescher

Rosalind Franklin

97 / 100

Category: Biology Ch 7 Class 11

Golden algae are also known as

Chrysophyta

Phaeophyta

Pyrrophyta

Rhodophyta

98 / 100

Category: Biology

Which was the first virus to be successfully crystalized?

NUMS Mock 1
Biology
Bio-diversity | Variety of Life

A) TMV

B) Smallpox

C) Poliovirus

D) Adenovirus

99 / 100

Category: Biology

Two species can avoid competition and better use the environment’s resources by occupying different ____.

NUMS Mock 4
Biology
Evolution

A) Adaptations

B) Polymorphism

C) Niches

D) Specialization

100 / 100

Category: Biology Ch 11 Class 11

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

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) Red

B) Blue

C) Green

D) Orange

Your score is

The average score is 61%

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