Biology Practice Test 2

Biology Practice Test 2 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 molecular biology, cell division, human physiology, plant physiology, and more, helping students improve accuracy and retention.

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1 / 100

Category: Biology Ch 13 Class 12

Driving force for all the cycles in ecosystem is

Water

Soil

Sun

Air

2 / 100

Category: Biology

Q.56 During cyclic photophosphorylation, electrons are diverted back to:

A. Plastoquinone

B. Cytochrome complex

C. Plastocyanin

D. Ferredoxin

3 / 100

Category: Biology Ch 1 Class 12

Secondary cell wall of sclerenchyma cells is impregnated with

Cellulose

Peptidoglycan and murein.

Lignin

Pectin

4 / 100

Category: Biology Ch 6 Class 11

The size of Spirochete is

0.1 -600 um

100-200 nm

500 um

0.75-1.25 um

5 / 100

Category: Biology Ch 11 Class 11

Quantitative study of energy relationships in biological systems obeys.

Bioenergetics

Laws of thermodynamics

Laws of thermo chemistry

Laws of chemical energeti

6 / 100

Category: Biology

Q.64 According to the induced fit model. What happens when an enzyme-substrate omplex is formed?

A. The contact between the substrate and the enzyme causes a change in the shape of the active site

B. The shape of the substrate and the shape of the active site are complementary to each other.

C. The substrate fits into active site and forms bonds with the amino acids at the active site.

D. All of the above.

7 / 100

Category: Biology Ch 10 Class 11

All the animals of the grade radiata are

Diploblastic

Triploblastic

Both

Unicellular

8 / 100

Category: Biology

Q.59 Which of the following is not an evidence for evolution?

A. Fossil record

B. Common ancestor organisms

C. Vestigial structures

D. none of these

9 / 100

Category: Biology Ch 4 Class 12

Luteinizing hormone, which is produced by the pituitary gland, promotes ovulation and stimulate the ovaries to produce:

NUMS 2019 Cancelled
Biology
Reproduction
Elimination Tool:

A) Estrogen

B) Estrogen and progesterone

C) Progesterone

D) Oxytocin

10 / 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

11 / 100

Category: Biology

Q.13 Without enzymes, the biological reaction would proceed at:

A. Same speed

B. Constant speed

C. Very slow speed

D. Variable speed

12 / 100

Category: Biology Ch 6 Class 11

If lipopolysaccharides did not appear in the wall of bacteria on staining then it will be known as ________.

UHS 2018
Biology
Kingdom Prokaryote
Elimination Tool:

A) Gram negative

B) Gram positive

C) Capsule

D) Both Gram positive & negative

13 / 100

Category: Biology Ch 9 Class 12

The Plasmid pBR322 has antibiotic resistance genes for:

UHS 2019
Biology
Biotechnology
Elimination Tool:

A) Streptomycin

B) Ampicillin and Tetracycline

C) Tetracycline and mxycycline

D) Ampicillin

14 / 100

Category: Biology Ch 7 Class 12

Gametes are produced by:

PMC 2021 Tested
Biology
Cell Cycle
Elimination Tool:

A) Meiosis

B) Mitosis

C) None of these

D) Fission

15 / 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

16 / 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

17 / 100

Category: Biology Ch 13 Class 11

Oxygen contents per liter of air is

10 ml

100 ml

200 ml

100ml

18 / 100

Category: Biology

Q.8 Which of the following structure provides greater pathogenicity to the bacteria?

A. slime

B. cell wall

C. cell membrane

D. capsule

19 / 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

20 / 100

Category: Biology Ch 6 Class 12

The sequence of nucleotides that determines the amino acid sequence of a protein is

Chromosome

DNA

RNA

Gene

21 / 100

Category: Biology

Q.8 How many carbon atoms contribute to form glucopyranose?

22 / 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

23 / 100

Category: Biology Ch 6 Class 11

Which of the following is TRUE about the structure of a typical bacterium?

PMC 2020
Biology
Kingdom Prokaryote
Elimination Tool:

A) It has cell wall

B) It has cytoplasm

C) It has genetic material

D) All of the above

24 / 100

Category: Biology Ch 2 Class 12

Which of the following statement is incorrect about Molluscans?

They are surrounded by single or double pieces of hard skeleton.

Their shell grows as the animal grows.

They have hydrostatic skeleton

They move by tube feet

25 / 100

Category: Biology

The animals that feed on organic debris from decomposing plants and animals are called:

NUMS Mock 1
Biology
Man and His Environment

A) Herbivores

B) Carnivores

C) Omnivores

D) Detritivores

26 / 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

27 / 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

28 / 100

Category: Biology Ch 12 Class 11

All of the insectivorous plants are true

Heterotrophs

Autotrophes

Carnivores

Saprotrophs

29 / 100

Category: Biology Ch 5 Class 12

Microcephaly, the small sized skull is due to:

NUMS 2016
Biology
Growth and Development
Elimination Tool:

A) Nutritional causes

B) Skeleton causes

C) Hormonal causes

D) Genetic defects

30 / 100

Category: Biology Ch 6 Class 11

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

Capsule

Slime

Cell Wall

Cell membrane

31 / 100

Category: Biology Ch 6 Class 11

Which of the following has a chain arrangement?

Streptobacillus

Streptococci

Staphylococci

Both A and B

32 / 100

Category: Biology Ch 10 Class 11

Of the following which one is not the characteristic of Kingdom Animalia.

All animals are ingestive heterotrophs

All animals are eukaryotes

All animals develop from the dissimilar gametes i.e. large sperm and small egg.

It is largest kingdom

33 / 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

34 / 100

Category: Biology Ch 6 Class 11

Which of the following bacteria do not have flagella commonly?

Cocci

Bacilli

Streptobacilli

Vibrio

35 / 100

Category: Biology

The cells which play a very important role in developing immunity are:

NUMS Mock 4
Biology
Transport

A) Monocytes

B) Neutrophils

C) Lymphocytes

D) Thrombocytes

36 / 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

37 / 100

Category: Biology Ch 9 Class 12

Recombinant DNA contains DNA from

2 different sources

3 different sources

2 same sources

3 same sources

38 / 100

Category: Biology Ch 2 Class 11

The specific heat capacity of water is the number of calories required to raise the temperature of water from _____ ˚C is 1.0.

NUMS 2019 Reconduct
Biology
Biological Molecules
Elimination Tool:

A) 15 to 16

B) 16 to 18

C) 15 to 20

D) 25 to 29

39 / 100

Category: Biology Ch 3 Class 12

Which of the following neurotransmitters function, both as neurotransmitter and hormones, decreasing our perception of pain?

PMC 2020
Biology
Coordination and Control
Elimination Tool:

A) Epinephrine

B) Serotonin

C) Dopamine

D) Endorphins

40 / 100

Category: Biology Ch 5 Class 11

DNA or RNA of viruses is enclosed in ______ coat:

Protein

Carbohydrate

Lipid

DNA

41 / 100

Category: Biology Ch 13 Class 11

The passageways of the respiratory system mucous secreting cells called:

NTS 2019
Biology
Gaseous Exchange
Elimination Tool:

A) Tracheal cells

B) Goblet cells

C) Surfactant cells

D) Pleural cells

42 / 100

Category: Biology

What type of virus is the smallpox virus?

NUMS Mock 1
Biology
Bio-diversity | Variety of Life

A) DNA enveloped virus

B) RNA enveloped virus

C) DNA virus

D) RNA naked virus

43 / 100

Category: Biology Ch 2 Class 11

Haemoglobin exhibits a:

NUMS 2016
Biology
Biological Molecules
Elimination Tool:

A) Secondary structure

B) Primary structure

C) Quaternary structure

D) Tertiary structure

44 / 100

Category: Biology Ch 3 Class 11

Which type of bonds are never formed when a substrate fits into the active site of an enzyme?

PMC Practice 1
Biology
Enzymes
Elimination Tool:

A) Hydrogen bonds

B) Ionic interactions

C) Hydrophobic interactions

D) Covalent linkages

45 / 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

46 / 100

Category: Biology Ch 2 Class 12

Pseudopodia are:

NTS 2016 DUHS & JSMU
Biology
Support and Movement
Elimination Tool:

A) False feet developed in some unicellular organisms

B) Small hairlike structures present on the unicellular organisms

C) Long, like structures coming out of the mouth

D) Suckers which are attached to the walls of intestines

47 / 100

Category: Biology

Q.15 The inhibitory effect of which inhibitor can be more dangerous in Krebs cycle?

A. Irreversible inhibitors

B. Competitive inhibitor

C. Reversible inhibitors

D. Non-competitive inhibitor

48 / 100

Category: Biology

Which of the following, which is the incorrectly paired one?

NUMS Mock 2
Biology
Biology and its Major Fields of Specialization

B) Schlelden and schwann … cell theory

C) Robert Brown… nucleus

D) Watson and Crick … DNA model

E) Virchow… mosaic model of plasma membrane

49 / 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

50 / 100

Category: Biology

The term “Loss of appetite” refers to disease:

NUMS Mock 3
Biology
Nutrition

A) Botulism

B) Anorexia nervosa

C) Obesity

D) Bulemia nervosa

51 / 100

Category: Biology

The position of an organism in a food chain of an ecosystem called:

NUMS Mock 2
Biology
Man and His Environment

A) Level of ecosystem

B) Food chain

C) Food web

D) Trophic level

52 / 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

53 / 100

Category: Biology Ch 4 Class 11

Who opposed the idea the cell is an empty space bounded by thick wall?

Lorenz Oken

Schwann

Robert Brown

Rudolph Virchow

54 / 100

Category: Biology

When a fetus is in the uterus, what carries oxygen away from the placenta?

NUMS Mock 1
Biology
Reproduction

A) The amniotic fluid

B) The amniotic sac

C) The lining of the uterus

D) The umbilical cord

55 / 100

Category: Biology Ch 9 Class 11

Antheridia and archegonia are born on _____ in bryophytes

Sporophyte

Gametophyte

Both of these

None of these

56 / 100

Category: Biology Ch 3 Class 11

The following statements are about enzymes:

1. They are globular proteins

2. They can be inhibited by competitive inhibitors

3. They are formed in the smooth endoplasmic reticulum

4. There are only found attached to Plasma membranes in the cell

Which statements are correct for all enzymes?

NTS 2015 DUHS and JSMU
Biology
Enzymes
Elimination Tool:

A) 1 and 4

B) 2 and 4

C) 1 and 2

D) 1,2,3 and 4

57 / 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

58 / 100

Category: Biology Ch 10 Class 12

Which of the following is not an evidence for evolution?

PMC Sample 3
Biology
Evolution
Elimination Tool:

A) Fossil record

B) Common ancestor organisms

C) Vestigial structures

D) none of these

59 / 100

Category: Biology Ch 5 Class 12

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

PMC Practice 1
Biology
Growth and Development
Elimination Tool:

A) Spiral and determinate

B) Spiral and indeterminate

C) Radial and determinate

D) Radial and indeterminate

60 / 100

Category: Biology

Carbon dioxide fixation can be enhanced by enhancing the efficiency of:

NUMS Mock 3
Biology
Bioenergetics

A) Auxins

B) Ribulose bisphosphate

C) Lactoferrin

D) Agrobacterium

61 / 100

Category: Biology Ch 11 Class 11

Chlorophyll molecule resemble the haem group of hemoglobin, the main difference between these two molecule is that chlorophyll has ____ ion.

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) Fe2+

B) Mg2+

C) Mn2+

D) Ca2+

62 / 100

Category: Biology

HIV is a:

NUMS Mock 3
Biology
Bio-diversity | Variety of Life

A) Virus

B) Prions

C) Viroid

D) Venom

63 / 100

Category: Biology Ch 12 Class 11

Carbohydrates, fats & proteins are essential for:

Metabolic processes of an organism

Providing energy

Formation of sturctures

All of these

64 / 100

Category: Biology

Q.67 What is the property of the part of a cell membrane which is in contact with external and internal environment?

A. hydrophobic

B. hydrophilic

C. neutral

D. Both A and B

65 / 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

66 / 100

Category: Biology Ch 4 Class 12

Egg-laying mammals are called:

NUMS 2016
Biology
Reproduction
Elimination Tool:

A) Prototheria

B) Protozoa

C) Chordata

D) Monotremes

E) Both A and D

67 / 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

68 / 100

Category: Biology Ch 8 Class 11

Mycorrhizae are found in about ______ vascular plants

90%

95%

98%

96%

69 / 100

Category: Biology Ch 10 Class 11

The maximum mammalian characters are present in ____

NUMS 2015
Biology
Kingdom Animalia
Elimination Tool:

A) Metatheria

B) Prototheria

D) None of the given options

C) Eutheria

70 / 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

71 / 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

72 / 100

Category: Biology Ch 9 Class 12

A weed engineered to produce a biodegradable plastic in cell granules is

. Mouse-cat cress

Mouse weed

Mouse-eared cress

None of these

73 / 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

74 / 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

75 / 100

Category: Biology Ch 9 Class 12

Cystic fibrosis patients lack a gene that codes for a transmembrane carrier of:

NTS 2017
Biology
Biotechnology
Elimination Tool:

A) Na+ ions

B) K+ ions

C) CI- ions

D) Ca2+ ions

76 / 100

Category: Biology Ch 3 Class 11

If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation:

Saturation

Denaturation

Composition

Inhibition

77 / 100

Category: Biology Ch 6 Class 11

A bacterial cell envelope of mollicutes does not include?

PMC Sample 1
Biology
Kingdom Prokaryote
Elimination Tool:

A) Slime

B) Capsule

C) Cell wall

D) Cell membrane

78 / 100

Category: Biology

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

NUMS Mock 4
Biology
Gaseous Exchange

A) Pleura

B) Alveoli

C) Chest cage

D) Diaphragm

79 / 100

Category: Biology Ch 4 Class 12

In which of the following options is mitotic division involved?

NUMS 2015
Biology
Reproduction
Elimination Tool:

A) Oogonium to primary oocyte

B) Primary oocyte to secondary oocyte

C) Secondary oocyte to egg

D) None of the given options

80 / 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%

81 / 100

Category: Biology Ch 10 Class 11

Pseudocoelem develops from

Blastopore

Plastoquinone

Blastocoel

Splitting of mesoderm

82 / 100

Category: Biology

Bones of the skull are joined by:

NUMS Mock 2
Biology
Support and Movement

A) Fixed joints

B) Sliding joints

C) Pivot joints

D) Hinge joints

83 / 100

Category: Biology

Q.38 Which of the following best describes a coenzyme?

A. Covalently bonded non-protein part of an enzyme

B. Cofactor consists of metal ions

C. Loosely bonded non-protein part of an enzyme

D. Both A and B

84 / 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

85 / 100

Category: Biology Ch 1 Class 11

The concept that various organisms dominated this planet during various geological time period and thus placing organisms in a time squence came from the studies by

Environmental biologist

Paleontologist

Marine biologist

Social biologist

86 / 100

Category: Biology Ch 9 Class 11

Bryophtes are called amphiabians of plant world because

Bryophytes like amphibian ancestors are one of the most primitive organisms in this world.

Bryophytes like amphibian live in damp shady places and close to water body.

Amphibians have close relation with bryophytes in their habitat.

All of these

87 / 100

Category: Biology Ch 8 Class 11

Fungi which get their food directly from dead organic matter are called?

Parasitic fungi

Predators

Mutualists

Decomposers

88 / 100

Category: Biology Ch 13 Class 11

Most oxygen is transported in the blood:

NUMS 2018
Biology
Gaseous Exchange
Elimination Tool:

A) In the form of bicarbonate ions.

B) Bound to albumin compounds.

C) Dissolved in the plasma.

E) Bound to hemoglobin.

89 / 100

Category: Biology Ch 6 Class 12

Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called

Mutation

Transuction

Replication

Variation

90 / 100

Category: Biology Ch 1 Class 12

Reabsorption of calcium is triggered by:

NUMS 2019 Reconduct
Biology
Homeostasis
Elimination Tool:

A) Aldosterone

B) Parathormone

C) Antidiuretic

D) Vasopressin

91 / 100

Category: Biology Ch 8 Class 11

Drug obtained from fungus used for lowing blood cholesterol is

UHS 2010
Biology
Kingdom Fungi
Elimination Tool:

A) Lovastatin

B) Cyclosporin

C) Ergotin

D) Griseofulvin

92 / 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

93 / 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

94 / 100

Category: Biology

Transport of glucose across the cell membrane occurs by:

NUMS Mock 1
Biology
Cell Structure and Function

A) Simple diffusion

B) Facilitated diffusion

C) Osmosis

D) Primary active transport

95 / 100

Category: Biology Ch 11 Class 11

RuBP + O2 —Rubisco—> PGA + _______

NTS 2016 DUHS & JSMU
Biology
Bioenergetics
Elimination Tool:

A) Phosphoglycerate

B) Phosphoglycolate

C) Glycerate

D) Glycolate

96 / 100

Category: Biology Ch 10 Class 12

Most fossils are found in the

Metamorphic rocks

Soil

Sedimentary rocks

Volcanic mountains

97 / 100

Category: Biology Ch 2 Class 12

When the muscle is required to contract, calcium ion binds with ______ molecule and causes them to move slightly.

NUMS 2019 Cancelled
Biology
Support and Movement
Elimination Tool:

A) Actin

B) Myosin

C) Troponin

D) Tropomyosin

98 / 100

Category: Biology Ch 14 Class 11

What will happen, if there is an increase in plasma albumin?

NUMS 2014
Biology
Transport
Elimination Tool:

A) Increased blood pressure

B) Increased rate of heart

C) Greater accumulation of tissue fluid

D) Decreased filtration in glomerulus

99 / 100

Category: Biology Ch 13 Class 11

Gaseous exchange in plants takes place through the:

NUMS 2020
Biology
Gaseous Exchange
Elimination Tool:

A) Stomata

B) Mesophyll

C) Endoderm

D) Xylem

100 / 100

Category: Biology Ch 6 Class 12

Highly condensed portions of the chromatin are called:

NTS 2011
Biology
Chromosomes and DNA
Elimination Tool:

A) Euchromatin

B) Heterochromatin

C) Nucleosome

D) Super coils

Your score is

The average score is 57%

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