Biology is the natural science that involves the study of life and living organisms, including their physical structure, chemical composition, function, development and evolution.Biology recognizes the cell as the basic unit of life, genes as the basic unit of heredity, and evolution as the engine that propels the creation of new species. Living organisms are open systems that survive by transforming energy and decreasing their local entropy to maintain a stable and vital condition defined as homeostasis. Biology divided into many specialized fields that cover their morphology, physiology, anatomy, behaviour, origin, and distribution.Just follow the Mcqs online quiz being dispatched over here with respect to your preparation for entry admission test NTS PPSC OTS PTS and missllenous job exams simultaneously.
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Biology Mcqs Online with Answers for NTS PPSC Entry Test Classes
Biology
Biology Mcqs with Answers Solved.
Which of the following is biotic component of ecosystem?
A. Gravity
B. Topography
C. Decomposers
D. Soil energy
Right Answer: C. Decomposers
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Green plants converts what?
A. Light energy into chemical energy
B. Chemical energy into light energy
C. Chemical energy into ATP
D. ATP energy into machenical energy
Right Answer: A. Light energy into chemical energy
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A substance that inhibit blood clotting is?
A. Histamin
B. Heparin
C. Interferon
D. All of these
Right Answer: B. Heparin
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Nervous system design is highly co – related with animals?
A. Life history
B. Life style
C. Evolution
D. Size and shape
Right Answer: B. Life style
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Imbibition can increase the volume dry seed upto?
A. 100 times
B. 200 times
C. 300 times
D. 400 times
Right Answer: B. 200 times
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How many number of muscles in human body
A. 650
B. 650 pairs
C. 550
D. 550 pairs
Right Answer: A. 650
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Amount of CO2 in 100 ml of venous blood is?
A. 50 ml
B. 54 ml
C. 4 ml
D. None of these
Right Answer: B. 54 ml
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The scientist provided the data about the ratios of different bases present in DNA molecules in
A. Erwin chargaff
B. William Watson
C. Mauric Wikins
D. Rosalind Franklin
Right Answer: A. Erwin chargaff
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True statement about lung cancer is?
A. 75% caused by smoking
B. 85% caused by smoking
C. 80% caused by smoking
D. 90% caused by smoking
Right Answer: D. 90% caused by smoking
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Book lungs are observed in which class?
A. Crustacae
B. Insecta
C. Arachnida
D. Myriapoda
Right Answer: C. Arachnida
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About 60% of the total volume of the leaf is?
A. Air spaces
B. Compact leaf materials
C. Mesophyl cells
D. Both a and c
Right Answer: B. Compact leaf materials
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The utilization of the products of digestion for production of energy or synthesis of cellular material is termed as?
A. Absorption
B. Assimilation
C. Digestion
D. Egestion
Right Answer: B. Assimilation
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Lungs are spongy because of the presence of millions of?
A. Capillaries
B. Bronchioles
C. Aveoli
D. all of these
Right Answer: C. Aveoli
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Armadillos are the armored mammals that live only in the?
- Africa
- Australia
- Europe
- America
Right Answer: America
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What is the correct route of urine from kidneys to out of body?
A. Pelvis → Urinary bladder → urethra
B. Pelvis → Urinary bladder → urethra → through penis in males
C. Pelvis → ureter → urethra → through vagina in females
D. Pelvis → ureter → urinary bladder → urethra
Right Answer: C. Pelvis → ureter → urethra → through vagina in females
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Receptor site for HIV is?
A. cd 1
B. cd 2
C. cd 3
D. None of these
Right Answer: D. None of these
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In placental mammals embryo is attached to its mother special organ placenta developed from the?
A. Uterus
B. Wall of uterus
C. Vagina
D. Ovary
Right Answer: B. Wall of uterus
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Destruction of all life forms is achieved through?
A. Sterilization
B. Antiseptics
C. Disinfectants
D. Antibiotics
Right Answer: A. Sterilization
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Amount of water in cytoplasm is?
A. 60%
B. 70%
C. 80%
D. 90%
Right Answer: D. 90%
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Which of the following is related to fresh water habitate?
A. Drink large amount of water
B. Preference of salt containing food
C. Multilayered dead keratinized skin cells
D. Both a and c
Right Answer: B. Preference of salt containing food
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Recombinant DNA is also called?
A. Completement DNA
B. Complex DNA
C. Complacent DNA
D. Chimaeric DNA
Right Answer: D. Chimaeric DNA
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The distance between adjacent base pairs of DNA double helix is?
A. 0.34A0
B. 3.4A0
C. 34A0
D. None
Right Answer: A. 0.34A0
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If tuft to flagella is present only at one pole of bacteria then these are?
A. Amphitrichous
B. Peritrichous
C. Lophotrichous
D. Mono trichous
Right Answer: C. Lophotrichous
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First complete seeds appeared approximately 365 million years ago during late?
A. Cambrian time
B. Ordovician time
C. Silurian time
D. Devonian time
Right Answer: D. Devonian time
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Hoofed grazing animals, such as horses, cattle and sheep are called?
A. Ungulates
B. Rodents
C. Digitigrades
D. None of these
Right Answer: A. Ungulates
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Which of the following have sheet like body?
A. Spirogyra
B. Volvox
C. Chlamydomonas
D. Ulva
Right Answer: D. Ulva
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In seeds rich in lipids such as castor bean and Soya beans glyoxysomes are sites for break down of fatty acids into?
A. Fumarate
B. Malonate
C. Oxalate
D. Succinate
Right Answer: D. Succinate
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Tentative explanation of observation is known as?
A. Hypothesis
B. Theory
C. Deduction
D. Law
Right Answer: A. Hypothesis
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Who introduced binomial nomenclature for naming species?
A. Linnaeus
B. Lamarck
C. Malthus
D. Cuvier
Right Answer: A. Linnaeus
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Brain is not protect by?
A. Carnium
B. Neural arches
C. CSF
D. Meninges
Right Answer: B. Neural arches
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The cells that cling to an egg after ovulation are known as?
A. Callus cells
B. Cumulus cells
C. Parenchyma cells
D. Sertoli cells
Right Answer: B. Cumulus cells
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Roots hair are extensions of?
A. Epidermis
B. Cortex
C. Both a and b
D. None of these
Right Answer: A .Epidermis
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If the liver as well as both kidneys are removed from an experimental animal?
A. Blood urea level falls rapidly
B. Blood urea level rises rapidly
C. Blood urea level remain constant
D. None of these
Right Answer: C. Blood urea level remain constant
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17.6% of total species is?
A. Insects
B. Animals other than insets
C. Fungi, Algae, Protozoa etc
D. Vascular Plants
Right Answer: D. Vascular Plants
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Number of nucleotides in the DNA of a typical human chromosome is about?
A. 100M
B. 120M
C. 140M
D. 160M
Right Answer: C. 140M
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Which of the following is incorrect about “Ethene”?
A. Breaks dormancy of buds
B. Promotes fruit ripening
C. May induced parthenocarpy
D. Promotes flowering in pineapple
Right Answer: C. May induced parthenocarpy
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The most common rust fungi is?
A. Puccinia
B. Ustilago
C. Both a and b
D. None of these
Right Answer: A. Puccinia
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A sequence of change in the community structure of an ecosystem over a period of time is called?
A. Transformation
B. Succession
C. Grazing
D. Forestation
Right Answer: B. Succession
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The stomach is situated below the diaphragm on the?
A. Left side of abdominal cavity
B. Right side of abdominal cavity
C. Middle of abdominal cavity
D. None of these
Right Answer: A. Left side of abdominal cavity
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Reasoning moves from general to specific is?
A. Deductive
B. Predicting
C. Inductive
D. Both a and b
Right Answer: A. Deductive
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Lamarck published his theory of evolution in?
- 1822
- 1812
- 1817
- 1809
Right Answer: 1809
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Which is present in both prokaryotic and Eukaryotic cells?
A. Nucleus
B. Mitochondria
C. Golgi apparatus
D. Ribosomes
Right Answer: D. Ribosomes
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Glyceraldeyde is a?
A. Triose
B. Tetrose
C. Pantose
D. Hexose
Right Answer: A. Triose
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Which of the following is incorrect about “ERYTHROCYTES”?
A. Once mature do not divide
B. Biconvex and have elastic plasma membrane
C. Formed in red bond marrow
D. All of these
Right Answer: B. Biconvex and have elastic plasma membrane
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Which is correct food chain?
A. Grass → Shrew → Mole → Owl
B. Owls → Shrew → Insect → Grass
C. Grass → Grazing insect → Shrews → Owls
D. Grass → Insect → Shrews → Owl
Right Answer: C. Grass → Grazing insect → Shrews → Owls
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Number of chloroplates present in the leaf surface is about?
A. 0.5 M / mm2
B. 1 M / mm2
C. 1.5 M / mm2
D. 2 M / mm2
Right Answer: A. 0.5 M / mm2
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Seal / fish food relationship is?
A. parasitism
B. symbiosis
C. predation
D. mutualism
Right Answer: C. predation
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The electromagnetic ray used in sterilization process?
A. α – rays
B. β – rays
C. γ – rays
D. None of these
Right Answer: C. γ – rays
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At the point of junction of the three bones ilium, ischium, pubis a depression is known as?
A. Forrnen triosseum
B. Acetabulum
C. Coracoid
D. Acetabularia
Right Answer: B. Acetabulum
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The most abundant carbohydrate in nature is?
A. Glucose
B. Starch
C. Cellulose
D. Glycogen
Right Answer: C. Cellulose
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That association between organisms in which both partners get benefits each other is called?
A. Mutualism
B. Commesalism
C. Competition
D. Predation
Right Answer: A. Mutualism
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Major constituent of birth control pill is?
A. Progesterone
B. LH
C. FSH
D. ICSH
Right Answer: A. Progesterone
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What is the function of rectal gland?
A. Remove salt against Osmotic gradient
B. Actively remove water
C. Store urea
D. Thermoregulation
Right Answer: A. Remove salt against Osmotic gradient
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Temperate phage in bacteriophage life cycle act as?
A. Master
B. Slave
C. Host
D. Guest
Right Answer: D. Guest
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No. of Amino acids in each turn of α- helix?
A. 0.36
B. 3.6
C. 36
D. 10
Right Answer: B. 3.6
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Most ciliates are capable of sexual process called?
A. Regeneration
B. Conjugation
C. Binary fission
D. Parthenogenesis
Right Answer: B. Conjugation
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Which order of classifactory divisions is correct?
A. kingdom, class, genus, family
B. phylum, class, order, genus
C. Species, order, family, phylum
D. Class, kingdom, family, order
Right Answer: B. phylum, class, order, genus
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Hyponasty is due to?
A. Gibberellins
B. Auxins
C. Absicisins
D. None of theses
Right Answer: A. Gibberellins
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Which of the following directly develop from apical meristem?
A. Root premordia
B. Shoot permordia
C. Leaf permordia
D. Both b and c
Right Answer: D. Both b and c
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what are the coelenterates?
A. Parasites
B. Saprobes
C. Carnivorous
D. All of these
Right Answer: C. Carnivorous
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If the DNA in all of the cells of an adult human were lined up end to end, it would stretch nearly?
A. 60 times the distance from earth to Jupiter
B. 60 times the distance from earth to moon
C. 50 times the distance from earth to Jupiter
D. 50 times the distance from earth to moon
Right Answer: A. 60 times the distance from earth to Jupiter
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A full set of genes of an individual is known as?
A. Genomic library
B. Genome
C. Genotype
D. Karyotype
Right Answer: B. Genome
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The sequence of nucleotides that determines the amino acid sequence of a protein is called a?
A. Codon
B. Anticodon
C. Gene
D. All of these
Right Answer: C. Gene
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Saliva is collected in (cockroach) inside?
A. Salivary gland
B. Salivary receptacle
C. Both a and b
D. None of these
Right Answer: B. Salivary receptacle
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Cone cells have specific light absorbing proteins called?
A. Pepsin
B. Tubulin
C. Opsins
D. Myosin
Right Answer: C. Opsins
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Which of the following conditions is related to conduction of nerve impulse?
A. Na+ are more outside than inside cell
B. Sodium gates closed
C. Inside of the membrane is positive
D. Large number of negative inorganic ions inside the membrane
Right Answer: C. Inside of the membrane is positive
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Florigen hormone is produced in?
A. Ethylene
B. Methylene
C. Acetic acid
D. Amino acid
Right Answer: A. Ethylene
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Growth controlling factor at stem tip is?
A. Any hormone
B. Auxin
C. Apical bud
D. Light
Right Answer: B. Auxin
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Site for gaseous exchange in respiration system of man is?
A. Bronchioles
B. Bronchi
C. Alveoli
D. All of these
Right Answer: C. Alveoli
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Unit of biological inheritance is?
A. Nucteolide
B. Nucleoside
C. Polypeptide
D. Gene
Right Answer: D. Gene
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Lamarck was incharge of invertebrate collection at Natural History Museum in?
- Berlin
- Brun
- California
- Paris
Right Answer: Paris
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The two opposite and two parallel strands of DNA are held together by?
A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Ester linkage
Right Answer: C. Hydrogen bond
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The branch of biology which deals with the study of aging is called?
A. Gerotology
B. Demography
C. Teratology
D. All of these
Right Answer: A. Gerotology
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Flowering parts are considered to have evolved from?
A. Shoots
B. Leaves
C. Seed
D. None of these
Right Answer: B. Leaves
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Serum hepatitis is cause by?
A. HAV
B. HBV
C. HCV
D. HDV
Right Answer: B. HBV
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Which of the following pair is mismatched?
A. Insecta: Three pairs of jointed legs
B. Myriapoda: Body is divide into large number of segments
C. Arachnida: Appendages called chelicerae
D. Crustacae: Mites and ticks
Right Answer: D. Crustacae: Mites and ticks
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Ability of terrestrial animals to tolerate dehydration is known?
A. Deamination
B. Anhydrobiosis
C. Odema
D. None of these
Right Answer: B. Anhydrobiosis
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What is our principle source of energy?
A. Nuclear energy
B. Geothermal energy
C. Solar energy
D. Tidal energy
Right Answer: C. Solar energy
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The most important group of proteins which are biological active?
A. Hormones
B. Antibodies
C. Enzymes
D. All of these
Right Answer: C. Enzymes
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Bacteria which obtained their food from dead organic matter are called?
A. Parasitic bacteria
B. Saporophytic bacteria
C. Heterotrophic bacteria
D. None of these
Right Answer: B. Saporophytic bacteria
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The contraction and relaxations movement in __________ expel the baby towards vagina called birth canal.
A. Uterine
B. Cervix
C. Ovary
D. Fallopain tube
Right Answer: A. Uterine
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In 1840.s, staple food of Irish people was?
A. Corn
B. Wheat
C. Rice
D. Potatoes
Right Answer: D. Potatoes
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The pores through which water enters into spongocoel are known as?
A. Ostia
B. Osculum
C. Both a and b
D. None of these
Right Answer: A. Ostia
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The science of studying the DNA sequences and properties of entire genome is called?
A. Genetics
B. Gene Pool
C. Genome
D. Genomics
Right Answer: D. Genomics
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All brown algae are multicellular and range from few centimeters to approximately?
A. 55 meters
B. 65 meters
C. 75 meters
D. 85 meters
Right Answer: C. 75 meters
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Some balance or ratio between growth inhibitors and growth stimulators is involved in?
A. Tropic movements
B. Tactic movements
C. Nastic movements
D. Tropic movements
Right Answer: C. Nastic movements
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Apart from urea, which of these does mammalian urine also contains?
A. Suerose
B. Water
C. Protein
D. Ammonium compound
Right Answer: B. Water
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In deoxyribose one oxygen is removed from Hydroxyl group at carbon no?
A. One
B. Two
C. Three
D. Four
Right Answer: B. Two
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Open growth is found in?
A. Plants
B. Evolved animals
C. Lower animals
D. All of these
Right Answer: A. Plants
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Weight of kidneys accounts for?
A. 1% of the total body weight
B. More than 1% of the total body weight
C. Less than 1% of the total body weight
D. None of these
Right Answer: C. Less than 1% of the total body weight
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The epithelial cells of villi are constantly shed into intestine. These cells are replaced by the new cells moving up due to rapid cell division in?
A. Oxyntic cell
B. Zymogen
C. Crypts
D. Polyps
Right Answer: C. Crypts
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Carlous Linnaeus took the scientific names from _______word.
A. Latin
B. Greek
C.French
D. English
Right Answer: A. Latin
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Sliding filament model was proposed in?
A. 1954
B. 1955
C. 1956
D. 1957
Right Answer: A. 1954
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Carlous Linnaeus was a?
A. Swedish botanist
B. Swedish zoologist
C. German botanist
D. German zoologist
Right Answer: A. Swedish botanist
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In blue green algae/ cyanobacteria photosynthetic pigments and electron transport chain component are located on?
A. Plasma membrane
B. Cytoplasm
C. Ribosome
D. Thylakoid membrane
Right Answer: D. Thylakoid membrane
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Which of the following is not a product of photosynthesis?
A. Glucose
B. Oxygen
C. Water
D. None of these
Right Answer: D. None of these
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Discoidal cleavage is observed in?
A. Rodents
B. Birds
C. Pices
D. None of these
Right Answer: B. Birds
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How much energy is transferred from one tropic level to the next in food chain?
A. 1%
B. 0.1%
C. 10%
D. 100%
Right Answer: C. 10%
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The I-bones have mid lines called?
A. K- lines
B. L- lines
C. M- lines
D. Z- lines
Right Answer: D. Z- lines
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The technique of recording the electrical activity of the heart is?
A. Electrocardiography
B. Electrocardiogram
C. Electrocardiograph
D. None of these
Right Answer: B. Electrocardiogram
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