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.
The process of shedding of exoskeleton is called?
A. Moulting
B. Decomposition
C. Pedipalps
D. Carapace
Right Answer: A. Moulting
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Which of the following hormone play important role in apical dominance except “AUXIN”?
A. Gibberellins
B. Cytokinins
C. Ethene
D. All of these
Right Answer: B. Cytokinins
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Today crop production is limited by effects of Salinization at about?
A. 30%
B. 40%
C. 50%
D. 60%
Right Answer: C. 50%
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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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Germ layers are formed during?
A. Cleavage
B. Gastrulation
C. Organogenesis
D. None of these
Right Answer: B. Gastrulation
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The most volume of chloroplast is covered by?
A. Envalope
B. Stroma
C. Thylakoid
D. None of these
Right Answer: B. Stroma
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Oldest known fossils are?
A. Eukaryotes
B. Prokaryotes
C. Cynobacteria
D. Both a and b
Right Answer: B. Prokaryotes
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Aphids suck the phloem juices out of the green stems by inserting their delicate?
A. Tubular mouth
B. Stylets
C. Tentacles
D. Mouth
Right Answer: B. Stylets
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In man malarial parasite plasmodium reproduces asexually by?
A. Binary fission
B. Multiple fission
C. Regeneration
D. Budding
Right Answer: B. Multiple fission
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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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During which stage of succession dermatocarpon and permellia develops?
A. Curstose lichen stage
B. Foliage lichen stage
C. Moss stage
D. Herbaceous stage
Right Answer: B. Foliage lichen stage
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In arthropods nitrogenous wastes are excreted in the form of?
A. Ammonia
B. Urea
C. Uric acid
D. All of these
Right Answer: C. Uric acid
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The edge of fern sporangium is divided?
A. Two parts
B. Three parts
C. Four parts
D. Five parts
Right Answer: A. Two parts
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Initially the classification was based on _________ of plants and animals.
A. Physiology
B. Morphology
C. Histology
D. None of these
Right Answer: B. Morphology
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Egg laying mammals are called?
A. Prototheria
B. Metatheria
C. Eutheria
D. None of these
Right Answer: A. Prototheria
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Total number of salivary glands in man is?
A. Three
B. Four
C. Five
D. Six
Right Answer: D. Six
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In human how many ova are usually discharged from the ovary at one time?
A. One
B. Two
C. Three
D. Four
Right Answer: A. One
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Plants bend towards light?
A. Because the roots send a message to the upper portion of the plants to do so
B. Because the secretion of growth promoting substance at the bend
C. Because the secretion of growth promoting substance at the top
D. As a result of food material trans located from leaves
Right Answer: B. Because the secretion of growth promoting substance at the bend
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Which one of the following is a kind of chemical link b/w catabolism and anabolism?
A. NAD
B. NADPH2
C. ATP
D. FAD
Right Answer: C. ATP
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Absorption of water and minerals takes place in?
A. Small intestine
B. Large intestine
C. Jejumum
D. Ileum
Right Answer: B. Large intestine
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RNA is synthesized by DNA in a process known as?
A. Translation
B. Transcription
C. Transformation
D. Transgenic organism
Right Answer: B. Transcription
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The place on the chromosomes where spindle fibers are attached during cell division is?
A. Centro mere
B. Chromatin
C. Kinetochore
D. Centrsome
Right Answer: A. Centro mere
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Movement of water and solutes is negligible along the?
A. Symplast pathway
B. Apoplast pathway
C. Vacular pathway
D. Both b a & c
Right Answer: C. Vacular pathway
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Outermost extra-embryonic membrane around foetus is?
A. Chorion
B. Amnion
C. Allantios
D. None of these
Right Answer: B. Amnion
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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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Energy currency of the cell is?
A. ATP
B. FAD
C. NAD
D. NADPH
Right Answer: A. ATP
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The second major producers of aquatic ecosystem is?
A. Green Algae
B. Dinoflagellates
C. Diatoms
D. Both b and c
Right Answer: B. Dinoflagellates
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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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In honeybees, union of sperm and egg result into the development of diploid except?
A. Drone bee
B. Queen bee
C. Worker bee
D. None of these
Right Answer: A. Drone bee
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Class of compound can store more amount of energy then other is?
A. Carbohydrates
B. Protein
C. Lipid
D. Nuclic acid
Right Answer: C. Lipid
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Which one reduces the reproductive capacities of microbial cells?
A. Microbicidal effect
B. Microbistatic effect
C. Both a and b
D. None of these
Right Answer: B. Microbistatic effect
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The oxygen evolved as by – product during photosynthesis is form?
A. Water absorbs by the roots
B. CO2 taken from atmosphere
C. Chlorophyll
D. The sacts absorbed as solution
Right Answer: A. Water absorbs by the roots
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Heat sensitive compounds like antibiotics, seras, hormones etc can be sterilized by?
A. Radiation filters
B. Membrane filters
C. Dry heat
D. Both a and b
Right Answer: B. Membrane filters
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Which type of wings are ideal for gliding into wind?
A. Short broad wings
B. Long broad wings
C. Short narrow wings
D. Long narrow wings
Right Answer: D. Long narrow wings
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Which one of the following disease tends to run in families?
A. Epilepsy
B. Parkinson’s disease
C. Alzheimer’s disease
D. All of these
Right Answer: C. Alzheimer’s disease
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Who said in 1902 that plant cells are totripotcnt?
A. G. Herberlandt
B. John C. Sanford
C. Sanger
D. Alferd Harry
Right Answer: A. G. Herberlandt
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No of Fatty Acids in Phosphatidic Acid is?
A. 1
B. 2
C. 3
D. 4
Right Answer: B. 2
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Light is insufficient to support photosynthesis in?
A. Littoral zone
B. Limnetic zone
C. Profundal zone
D. None of these
Right Answer: C. Profundal zone
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Which of the following characteristics of viruses is not like that of living things?
A. Crystal formation
B. Respiration
C. Growth
D. Reproduction
Right Answer: A. Crystal formation
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Photo system present in blue green algae is?
A. Photo system I
B. Photo system II
C. PS 680
D. Both b and c
Right Answer: B. Photo system II
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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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Kind of RNA present in least amount?
A. m – RNA
B. t – RNA
C. r – RNA
D. None of these
Right Answer: A. m – RNA
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Useful substances like algin, agar carrageenan and antiseptics are obtained from?
A. Marine Algae
B. Fresh Water Algae
C. Ponds Algae
D. All of these
Right Answer: A. Marine Algae
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In most animals the epithelium which separates air and blood is only?
A. One called thick
B. Two called thick
C. Three called thick
D. None of these
Right Answer: B. Two called thick
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Which of the following is non-mammalian character?
A. Only right aortic arch
B. Homeothermic
C. ViviparousNon-nucleated red blood cells
D.
Right Answer: A. Only right aortic arch
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What is Glycylalanin?
A. Dipeptide
B. Dinucleotide
C. Disaccharide
D. All
Right Answer: A. Dipeptide
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The approximate diameter of peroxisomes is?
A. 5μm
B. 0.5μm
C. 0.05μm
D. 0.005μm
Right Answer: B. 0.5μm
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Genetic drift occurs in a population that is?
A. Mobile
B. Isolated
C. Small in number
D. Have few gene mutations
Right Answer: C. Small in number
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In round worms nerve ring is present around?
A. Mouth
B. Alimentary canal
C. Pharynx
D. Gat
Right Answer: C. Pharynx
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The weight of blood in our body is about _________ of our body weight.
A. 1/10th
B. 1/11th
C. 1/12th
D. 1/13th
Right Answer: C. 1/12th
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The shape of the diaphragm is more dome like when its muscles are?
A. Relaxed
B. Contracted
C. Both a & b
D. None of these
Right Answer: A. Relaxed
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The company sequenced the entire genome is?
A. Craig
B. Venter
C. Celera
D. Chimaeric
Right Answer: C. Celera
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The areas of the lungs in which gas exchange does not takes place is called?
A. Dead space
B. Alveolar dead space
C. Dead air space
D. None of these
Right Answer: A. Dead space
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No of carbon atoms in glucopyranose ring?
A. 4
B. 5
C. 6
D. 7
Right Answer: B. 5
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An ecosystem without its abiotic factors is called?
A. Species
B. Population
C. Community
D. Niche
Right Answer: C. Community
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Plant cells that have had cell wall removed are called?
A. Proplasm
B. Protoplast
C. Totipotent
D. Fragile cell
Right Answer: B. Protoplast
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Biological name of sundew is?
A. Drosera intermedia
B. Sarracenia pupurea
C. Dionaea muscipula
D. None of these
Right Answer: A. Drosera intermedia
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Which of the following can feed on all trophic levels?
A. Fungi
B. Algae
C. Carnivores
D. All of these
Right Answer: A. Fungi
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Which lobe of pituitary gland is referred as MASTER GLAND?
A. Anterior
B. Median
C. Posterior
D. the whole gland
Right Answer: A. Anterior
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Casparian strips are present in?
A. Epidermis
B. Cortex
C. Endodermis
D. Pericycle
Right Answer: C. Endodermis
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What is Prophage?
A. RNA virus
B. a hybrid of bacterial and viral DNA
C. a stage in lytic cycle
D. None of these
Right Answer: B. a hybrid of bacterial and viral DNA
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Permeability of gram negative bacteria is?
A. Equal to gram positive
B. More than gram positive
C. Less than gram positive
D. None of these
Right Answer: C. Less than gram positive
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In flowering plants, one form of parthenogenesis is called?
A. Climateric
B. Vernalisation
C. Apomixis
D. All of these
Right Answer: C. Apomixis
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The structure that prevents the food from entering the nasal cavities is?
A. Epiglottis
B. Soft palate
C. Pharynx
D. Tongue
Right Answer: B. Soft palate
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What is the function of heat – shock proteins in plants?
A. Cause evaporative cooling
B. Control opening and closing of stomata
C. Prevent denaturation of enzymes
D. Changes the solute composition of the cell
Right Answer: C. Prevent denaturation of enzymes
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The volume of the phage is about ________ of the host.
A. 1/10
B. 1/100
C. 1/1000
D. None of these
Right Answer: C. 1/1000
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Sciatica results due to injury of?
A. Proximal sciatic nerve
B. Distal sciatic nerve
C. Anterior sciatic nerve
D. Posterior sciatic nerve
Right Answer: A. Proximal sciatic nerve
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Optimum pH of salivary amylase is?
A. 4.50
B. 6.80
C. 9.70
D. 9.00
Right Answer: B. 6.80
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Photoperiod affects flowering, when shoot meristems start producing?
A. Leaves
B. Floral buds
C. k Lateral buds
D. All of these
Right Answer: B. Floral buds
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Which of the following muscles is inserted in the ulna?
A. biceps brachii
B. brachialis
C. brachioradialus
D. Both b and c
Right Answer: B. brachialis
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Which of the following statement is not true about porifera?
A. Sponges lack symmetry
B. Mesenchyme contains amoeboid cells
C. Outer layer is choanoderm
D. Spongocoel is present
Right Answer: C. Outer layer is choanoderm
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Proglottids are involved in?
A. Excretion
B. Reproduction
C. Transportation
D. None of these
Right Answer: B. Reproduction
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Which of the following statement is incorrect about photorespiration?
A. Light dependent process
B. CO2 is released and O2 is absorbed
C. Produce energy such as ATP
D. Rubisco act as oxygenase
Right Answer: C. Produce energy such as ATP
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All bacteria are?
A. Diploid
B. Haploid
C. Monoploid
D. Both b and c
Right Answer: B. Haploid
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In planaria undigested food is egested through the?
A. Anus
B. Blastopore
C. Mouth
D. Cloaca
Right Answer: C. Mouth
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Which one of the following is not a fern?
A. Dryopteris
B. Pteridium
C. Equisteum
D. Adiantum
Right Answer: C. Equisteum
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Siprochete is?
A. thick, flexible, spiral
B. thin, rigid, spiral
C. thick, rigid, spiral
D. thin, flexible, spiral
Right Answer: D. thin, flexible, spiral
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Effect of adrenaline and noradrenalin in raising blood pressure is?
A. Antagonistic
B. Synergistic
C. Random
D. All of these
Right Answer: B. Synergistic
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Which of the following enzyme is present at replication fork?
A. Helicase
B. Ligase
C. Primase
D. DNA polymerase III
Right Answer: A. Helicase
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Which one play important role in the maintenance f cell shape?
A. Microtubules
B. Microfilaments
C. Intermediate filaments
D. All of these
Right Answer: C. Intermediate filaments
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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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The word biology has been derived from two ________ words.
A. Greek
B. Latin
C. Arabic
D. French
Right Answer: A. Greek
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Which one of the following reproduces asexually by “Budding”?
A. Planaria
B. Hydra
C. Amoeba
D.Both b and c
Right Answer: B. Hydra
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Which of the following process probably freed living organisms from dwindling supply of nutrients?
A. Aerobic respiration
B. Replication
C. Digestion
D. Photosynthesis
Right Answer: D. Photosynthesis
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The basic unit of biological classification is?
A. Orders
B. Families
C. Genera
D. Species
Right Answer: D. Species
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Protein present in microbubules is?
A. Tubulin
B. Actin
C. Tropomyosin
D. Myosin
Right Answer: A. Tubulin
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Which of the following is not accordance with phyletic lineage?
A. Reptiles evolved from amphibians
B. Birds evolved from reptiles
C. Mammals evolved from birds
D. Both birds and mammals evolved from reptiles
Right Answer: C. Mammals evolved from birds
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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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The complete mature and infectious particle is known as?
A. Pirion
B. Virion
C. orf virus
D.Both a and c
Right Answer: B. Virion
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Which of the following provides nourishment of the sperms?
A. Sertoli cells
B. Epididymis
C. Seminal vesicle
D. None of these
Right Answer: A. Sertoli cells
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Only mucous saliva is secreted by?
A. Parotid glands
B. Submandibular glands
C. Sublingual glands
D. None of these
Right Answer: C. Sublingual glands
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During elongation cell volume increases upto?
A. 100 folds
B. 150 folds
C. 200 folds
D. 250 folds
Right Answer: 150 folds
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Photosynthetic pigments are organized into clusters for efficient absorption & utilization of solar energy in thylakoids membranes are called?
A. Photosystem
B. ETC
C. Storage system
D. None of these
Right Answer: A. Photosystem
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The codons which code for the same amino acid are called?
A. Probes
B. Introns
C. DNA profile
D. Synonyms
Right Answer: D. Synonyms
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Organs structurally different but functionally alike are?
A. Homologous
B. Analogous
C. Both a and b
D. None of these
Right Answer: B. Analogous
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Which of the following is correct and complete sequence?
A. Genus, family, class
B. Family, class, Phylum
C. Genus, Family, order
D. Order, Phylum, Kingdom
Right Answer: C. Genus, Family, order
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Frogs and toads all walk and hope on land due to its strong?
A. Fore limbs
B. Hind limbs
C. Pelvic girdle
D. None of these
Right Answer: B. Hind limbs
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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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Which of the following is the bacterial disease?
A. Mumps
B. Candidosis
C. T.B
D. Both b and c
Right Answer: C. T.B
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Glyceraldeyde is a?
A. Triose
B. Tetrose
C. Pantose
D. Hexose
Right Answer: A. Triose
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