CBSE Class 11 Biology Biological Classification MCQs Set 01

Multiple Choice Questions (MCQs) for Class 11 Biology: Chapter 02 Biological Classification

Access targeted multiple-choice questions for Chapter 02 Biological Classification designed to align with the latest CBSE academic syllabus for Class 11 Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Practice Chapter 02 Biological Classification MCQs for Class 11 Biology

View or download the dedicated Chapter 02 Biological Classification MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

Question : Which of the following processes are involved in the reproduction of protista?

a) Cell fusion and zygote formation

b) Spore formation and fragmentation

c) Budding and spore formation

d) Binary fission and fragmentation

Answer : Cell fusion and zygote formation

 

Question : In prokaryotes, the genetic material is

a) circular DNA without histones

b) linear DNA without histones

c) circular DNA with histones

d) linear DNA with histones

Answer : circular DNA without histones

 

Question : Bacteria is a group of prokaryotic organisms which is characterised by

a) All of the above

b) Simple structure and complex behaviour

c) 70 S ribosomes

d) Peptidoglycan cell wall

Answer : All of the above

 

Question : What may be a 'photosynthetic protistian' to one biologist may be 'a plant' to another? Which of the given below features of slime moulds shows linkage with plant?

a) Slime moulds have cellulosic spore wall

b) Formation of fruiting bodies

c) Presence of diverse sexual reproduction

d) Presence of holozoic nutrition

Answer : Slime moulds have cellulosic spore wall

 

Question : Choose the correct match

a) Desmids – Chrysophytes

b) Gymnodinium – Hemicellulosic plates in wall

c) Euglena – Chlorophyll a & c

d) Gonyaulax – Red sea

Answer : Desmids – Chrysophytes

 

Question : Nuclear dimorphism is shown by

a) Paramecium

b) Plasmodium

c) Amoeba

d) Trypanosoma

Answer : Paramecium

 

Question : Most common type of genetic material present in bacteriophages is

a) ds DNA

b) ds RNA

c) ss RNA

d) ss DNA

Answer : ds DNA

 

Question : Which of the following statement about Mycoplasma is true:

a) They differ from viruses in being cellular in organisation

b) Insensitive to several antibiotics as they have 70S ribosomes

c) They can survive without photosynthetic pigments and genetic material

d) They are smallest, disease causing thin walled organisms

Answer : They differ from viruses in being cellular in organisation

 

Question : Eubacteria can be differentiated from archaebacteria on the basis of

a) Cell wall

b) Ribosomes

c) Gene of tRNA

d) Nutrition

Answer : Cell wall

 

Question : Phenetic classification of organisms is based on

a) Observable characteristics of existing organisms

b) The ancestral lineage of existing organisms

c) Dendogram based on DNA characteristics

d) Sexual characteristics

Answer : Observable characteristics of existing organisms 

 

Question : The practical purpose of classification of living organisms is to

a) facilitate identification of unknown organisms

b) name the living organisms

c) trace the evolution of living organisms

d) explain the origin of living organisms

Answer : facilitate identification of unknown organisms

 

Question : A system of classification in which a large number of traits are considered, is

a) natural system

b) synthetic system

c) artificial system

d) phylogenetic system

Answer : natural system

 

Question : In five kingdom system, the main basis of classification is

a) mode of nutrition

b) asexual reproduction

c) structure of nucleus

d) structure of cell wall

Answer : mode of nutrition

 

Question : Phenetic classification is based on

a) Observable characteristics of existing organisms

b) Dendograms based on DNA characteristics

c) The ancestral lineage of existing organisms

d) Sexual characteristics

Answer : Observable characteristics of existing organisms

 

Question : In which kingdom would you classify the archaebecteria and nitrogen-fixing organisms. If the five-kingdom system of classification is used ?

a) Monera

b) Fungi

c) Plantae

d) Protista

Answer : Monera

 

Question : On how many criteria living organisms have been classified into five kingdoms ?

a) Four

b) Three

c) Two

d) Five

Answer : Four

 

Question : First true phylogenetic system of classification was given by

a) Engler and Prantl

b) de Candolle

c) Eichler

d) de Jussiaeu

Answer : Engler and Prantl

 

Question : Which of the following is not correctly matched?

a) Covered smut of barley - Ustilago nuda

b) Late blight of potato - Phytophthora infestans

c) Smut of bajra - Tolysporium penicillariae

d) Root knot disease - Meloidogyne javanica

Answer : Covered smut of barley - Ustilago nuda

 

Question : Which one of the following character was not used by R.H. Whittaker for biological classification ?

a) Physiological characters

b) Thallus organisation

c) Phylogenetic relationships

d) Cell structure

Answer : Physiological characters

 

Question : ‘Comma’ shaped bacteria are known as

a) vibrio

b) spiral

c) coccus

d) spirillum

Answer : vibrio

 

Question : Basic unit or smallest taxon of taxonomy/ classification is 
a) species
b) kingdom
c) family
d) variety
Answer:  species
 
Question : Linnaeus evolved a system of nomenclature called 
a) mononomial
 b) vernacular
c) binomial
d) polynomial
Answer:  binomial
 
Question : A taxon is 
a) a group of related families
b) a group of related species
c) a type of living organisms
d) a taxonomic group of any ranking
Answer: a taxonomic group of any ranking
 
Question : An important criterion for modern day classification is
a) resemblances in Morphology
b) anatomical and physiological traits
c) breeding habits
d) presence or absence of notochord
Answer: anatomical and physiological traits
 
Question : Sequence of taxonomic categories is 
a) class-phylum-tribe-order-family-genusspecies
b) division-class-family-tribe-order-genusspecies
c) division-class-order-family-tribe-genusspecies
d) phylum-order-class-tribe-family-genusspecies
Answer: division-class-order-family-tribe-genusspecies
 
Question : The term “Phylum” was given by 
a) Cuvier
b) Haeckel
c) Theophrastus
d) Linnaeus
Answer: Cuvier
 
Question : Binomial nomenclature means 
a) one name given by two scientists
b) one scientific name consisting of a generic and a specific name
c) two names, one Latinised, other of a person
d) None of the above
Answer: one scientific name consisting of a generic and a specific name
 
Question : “Taxonomy without phylogeny is similar to bones without flesh” is the statement of 
a) Oswald Tippo
b) John Hutchinson
c) Takhtajan
d) Bentham and Hooker
Answer: Takhtajan
 
Question : Binomial nomenclature consists of two words 
a) genus and species
b) order and family
c) family and genus
d) species and variety
Answer: genus and species
  
Question : Phylogenetic classification is based on 
a) utilitarian system
b) habits
c) overall similarities
d) common evolutionary descent
Answer: common evolutionary descent
 
Question : Species is 
a) basic unit of classification
b) unit in the evolutionary history of a tree
c) specific class of evolution
d) not related to evolution
Answer: basic unit of classification
 
Question : The closely related morphologically similar sympatric populations, but reproductively isolated, are designated as 
a) clines
b) demes
c) clones
d) sibling species
Answer: sibling species
 
Question : If two or more species occupy overlapping areas, they are
a) sibling
b) allochronic
c) keystone
d) sympatric
Answer: sympatric
 
Question : In the five-kingdom system of classification, which single kingdom out of the following can include blue-green algae, nitrogen-fixing bacteria and methanogenic archaebacteria?
a) Fungi
b) Plantae
c) Protista
d) Monera
Answer: Monera
 
Question : A system of classification in which a large number of traits are considered, is 
a) artificial system
b) synthetic system
c) natural system
d) phylogenetic system  
Answer: natural system
 
Question : The vector for sleeping sickness is 
a) house fly
b) tse-tse fly
c) sand fly
d) fruit fly
Answer: tse-tse fly
 
Question : The infective state of malarial parasite Plasmodium that enters human body is 
a) merozoite
b) sporozoite
c) trophozoite
d) minuta form
Answer: sporozoite
 
Question : Trypanosoma belongs to class 
a) Sarcodina
b) Zooflagellata
c) Ciliata
d) Sporozoa
Answer: Zooflagellata
 
Question : Malaria fever coincides with liberation of
a) cryptomerozoites 
b) metacryptomerozoites
c) merozoites
d) trophozoites
Answer: merozoites
 
Question : Plasmodium, the malarial parasite, belongs to class 
a) Sarcodina
b) Ciliata
c) Sporozoa
d) Dinophyceae
Answer: Sporozoa
 
Question : Amoebiasis is prevented by 
a) eating balanced food
b) eating plenty of fruits
c) drinking boiled water
d) using mosquito nets
Answer: drinking boiled water
 
Question : Genetic information in Paramecium is contained in 
a) micronucleus
b) macronucleus
c) Both a) & b)
d) mitochondria
Answer: micronucleus
 
Question : What is true about Trypanosoma? 
a) Polymorphic
 b) Monogenetic
c) Facultative parasite
d) Non-pathogenic
Answer: Polymorphic
 
Question : African sleeping sickness is due to 
a) Plasmodium vivax transmitted by tse-tse fly
b) Trypanosoma lewsii transmitted by bed bug
c) Trypanosoma gambiense transmitted by Glossina palpalis
d) Entamoeba gingivalis spread by house fly
Answer: Trypanosoma gambiense transmitted by Glossina palpalis
 
Question : Who discovered Plasmodium in RBC of human beings? 
a) Ronald Ross
b) Mendel
c) Laveran
d) Stephen
Answer: Laveran
 
Question : Malignant tertian malaria is caused by 
a) Plasmodium falciparum
b) P. vivax
c) P. ovale
d) P. malariae
Answer:  Plasmodium falciparum
 
Question : In Amoeba and Paramecium osmoregulation occurs through 
a) pseudopodia
b) nucleus
c) contractile vacuole
d) general surface
Answer: contractile vacuole
 
Question : The part of life cycle of malarial parasite Plasmodium vivax, that is passed in female Anopheles is 
a) sexual cycle
b) pre-erythrocytic schizogony
c) exo-erythrocytic schizogony
d) post-erythroeytic schizogony
Answer: sexual cycle
 
Question : If all ponds and puddles are destroyed, the organism likely to be destroyed is 
a) Leishmania
b) Trypanosoma
c) Ascaris
d) Plasmodium
Answer: Plasmodium
 
Question : Entamoeba coli causes 
a) pyorrhoea
b) diarrhoea
c) dysentery
d) None of these 
Answer: diarrhoea
 
Question : Which one belongs to Monera? 
a) Amoeba
b) Escherichia
c) Gelidium
d) Spirogyra
Answer: Escherichia
 
Question : A non-photosynthetic aerobic nitrogen fixing soil bacterium is 
a) Rhizobium
b) Clostridium
c) Azotobacter
d) Klebsiella
Answer: Azotobacter
 
Question : The main difference in Gram (+)ve and Gram (-)ve bacteria resides in their
a) cell wall
b) cell membrane
c) cytoplasm
d) flagella 
Answer: cell wall
 
Question : Bacteria lack alternation of generation because there is 
a) neither syngamy nor reduction division
b) distinct chromosomes are absent
c) no conjugation
d) no exchange of genetic material 
Answer: neither syngamy nor reduction division
 
Question : Name the organisms which do not derive energy directly or indirectly from sun 
a) chemosynthetic bacteria
b) pathogenic bacteria
c) symbiotic bacteria
d) mould
Answer: chemosynthetic bacteria
 
Question : Genophore bacterial genome or nucleoid is made of 
a) histones and nonhistones
b) RNA and histones
c) a single double stranded DNA
d) a single stranded DNA
Answer: a single double stranded DNA
 
Question : Escherichia coli is used extensively in biological research as it is 
a) easily cultured
b) easily available
c) easy to handle
d) easily multiplied in host
Answer: easily cultured
 
Question : Rickettsiae constitute a group under 
a) bacteria
b) viruses
c) independent group between bacteria and viruses
d) fungi 
Answer: bacteria
 
Question : The term antibiotic was first used by 
a) Fleming
b) Pasteur
c) Waksman
d) Lister
Answer: Waksman
 
Question : Temperature tolerance of thermal blue-green algae is due to 
a) cell wall structure
b) cell organization
c) mitochondrial structure
d) homopolar bonds in their proteins
Answer: cell wall structure
 
Question : Non-symbiotic nitrogen fixers are 
a) Azotobacter
b) Pseudomonas
c) soil fungi
d) blue-green algae
Answer: Azotobacter
 
Question : Nitrogen fixer soil organisms belong to 
a) mosses
b) bacteria
c) green algae
d) soil fungi
Answer: bacteria
 
Question : The plasmid 
a) helps in respiration
b) genes found inside nucleus
c) is a component of cell wall of bacteria
d) is the genetic part in addition to DNA in micro-organisms
Answer: is the genetic part in addition to DNA in micro-organisms
 
Question : Azotobacter and Bacillus polymyxa are the examples of 
a) symbiotic nitrogen-fixers
b) non-symbiotic nitrogen-fixers
c) ammonifying bacteria
d) disease-causing bacteria
Answer: non-symbiotic nitrogen-fixers
 
Question : In bacterial chromosomes, the nucleic acid polymers are 
a) linear DNA molecule
b) circular DNA molecule
c) of two types-DNA and RNA
d) linear RNA molecule
Answer: circular DNA molecule
 
Question : Absorptive heterotrophic nutrition is exhibited by  
a) algae 
b) fungi 
c) bryophytes
d) pteridophytes 
Answer: fungi 
 
Question : Ustilago caused plant diseases are called smuts because  
a) they parasitise cereals 
b) mycelium is black 
c) they develop sooty masses of spores 
d) affected parts become completely black 
Answer: they develop sooty masses of spores 
 
Question : Decomposers are organisms that  
a) elaborate chemical substances, causing death of tissues 
b) operate in living body and simplifying organic substances of cells step by step 
c) attack and kill plants as well as animals 
d) operate in relay terms, simplifying step by step the organic constituents of dead body 
Answer: operate in relay terms, simplifying step by step the organic constituents of dead body 
 
Question : Claviceps purpurea is causal organism of  
a) smut of barley 
b) rust of wheat
c) ergot of rye 
d) powdery mildew of pea 
Answer: ergot of rye 
 
Question : The chemical compounds produced by the host plants to protect themselves against fungal infection is  
a) phytotoxin
b) pathogen 
c) phytoalexins
d) hormone 
Answer: phytoalexins
 
Question : White rust disease is caused by  
a) Claviceps
b) Alternaria 
c) Phytophthora
d) Albugo candida 
Answer: Albugo candida 
 
Question : Most of the lichens consist of 
a) blue-green algae and Basidomycetes 
b) blue-green algae and Ascomycetes 
c) red algae and Ascomycetes 
d) brown algae and Phycomycetes
Answer: blue-green algae and Ascomycetes 
 
Question : Yeast-Saccharomyces cerevisiae is used in the industrial production of  
a) citric acid
b) tetracycline 
c) ethanol
d) butanol
Answer: ethanol
 
Question : Which one of the following micro-organisms is used for production of citric acid in industries? 
a) Penicillium citrinum 
b) Aspergillus niger 
c) Rhizopus nigricans 
d) Lactobacillus bulgaricus
Answer: Aspergillus niger 
 
Question : Puccinia forms  
a) uredia and aecia on wheat leaves 
b) uredia and telia on wheat leaves 
c) uredia and aecia on barbery leaves 
d) uredia and pycnia on barbery leaves
Answer: uredia and telia on wheat leaves 
 
Question : Black rust of wheat is caused by  
a) Puccinia 
b) Mucor 
c) Aspergillus 
d) Rhizopus
Answer: Puccinia 
 
Question : In fungi stored food material is  
a) glycogen 
b) starch 
c) sucrose 
d) glucose
Answer: a) glycogen 
 
Question : Adhesive pad of fungi penetrates the host with the help of  
a) mechanical pressure and enzymes 
b) hooks and suckers 
c) softening by enzymes 
d) only by mechanical pressure
Answer: mechanical pressure and enzymes 
 
Question : Plant decomposers are 
a) Monera and Fungi 
b) Fungi and Plants 
c) Protista and Animalia 
d) Animalia and Monera 
Answer: Monera and Fungi
 
Question : During the formation of bread it becomes porous due to release of CO2 by the action of  
a) yeast
b) bacteria 
c) virus
d) protozoans 
Answer: yeast
 
Question : Reverse transcriptase is  
a) RNA dependent RNA polymerase 
b) DNA dependent RNA polymerase 
c) DNA dependent DNA polymerase 
d) RNA dependent DNA polymerase 
Answer: RNA dependent DNA polymerase 
 
Question : Tobacco Mosaic Virus (TMV) genes are  
a) double stranded RNA 
b) single stranded RNA 
c) polyribonucleotides 
d) proteinaceous
Answer: single stranded RNA 
 
Question : Interferons are  
a) antiviral proteins 
b) antibacterial proteins 
c) anticancer proteins 
d) complex proteins
Answer: antiviral proteins
 
Question : In which one of the following pairs of diseases both are caused by viruses?  
a) Tetanus and typhoid 
b) Whooping cough and sleeping sickness 
c) Syphilis and AIDS
d) Measles and rabies
Answer: Measles and rabies
 
Question : Influenza virus has  
a) DNA 
b) RNA 
c) Both a) and b) 
d) only proteins and no nucleic acids
Answer: RNA 
 
Question : Which one of the following statements about viruses is correct?  
a) Viruses possess their own metabolic system 
b) Viruses contain either DNA or RNA 
c) Viruses are facultative parasites
d) Viruses are readily killed by antibiotics
Answer: Viruses contain either DNA or RNA 
 
Question : Human Immunodeficiency Virus (HIV) has a protein coat and a genetic material which is  
a) single stranded DNA 
b) single stranded RNA 
c) double stranded RNA 
d) double stranded DNA
Answer: single stranded RNA 
 
Question : Small proteins produced by vertebrate cells naturally in response to viral infections and which inhibit multiplication of viruses are called  
a) immunoglobulins 
b) interferons 
c) antitoxins 
d) lipoproteins
Answer: interferons 
 
Question : Cauliflower mosaic virus contains  
a) ssRNA 
b) dsRNA
c) dsDNA 
d) ssDNA 
Answer: dsDNA 
 
Question : Interferons are synthesized in response to
a) mycoplasma
b) bacteria 
c) viruses
d) fungi
 Answer: viruses
 
Question : Which one of the following statements about viruses is correct?  
a) Nucleic acid of viruses is known as capsid 
b) Viruses possess their own metabolic system 
c) All viruses contain both RNA and DNA 
d) Viruses are obligate parasites
Answer: Viruses are obligate parasites
 
Question : Viruses are no more “alive” than isolated chromosomes because  
a) both require the environment of a cell to replicate 
b) they require both RNA and DNA 
c) they both need food molecules 
d) they both require oxygen for respiration
Answer: both require the environment of a cell to replicate 
 
Question : Tobacco mosaic virus is a tubular filament of size  
a) 700 × 30 nm
b) 300 × 10 nm 
c) 300 × 5 nm  
d) 300 × 18 nm
Answer: 300 × 18 nm
 
Question : Which of the following statements is not true for retroviruses?  
a) DNA is not present at any stage in the life cycle of retroviruses 
b) Retroviruses carry gene for RNA dependent DNA polymerase 
c) The genetic material in mature retroviruses is RNA 
d) Retroviruses are causative agents for certain kinds of cancer in man
Answer: DNA is not present at any stage in the life cycle of retroviruses 
 
Question : Viruses that infect bacteria, multiply and cause their lysis, are called  
a) lysozymes
b) lytic 
c) lipolytic
d) lysogenic
Answer: lytic 

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