CBSE Class 11 Biology Biological Classification Worksheet Set A

Important Questions for NCERT Class 11 Biology Biological Classification

Question. Viruses have
(a) DNA enclosed in a protein coat
(b) prokaryotic nucleus
(c) single chromosome
(d) both DNA and RNA. 
Answer. A

Question. Which statement is wrong for viruses?
(a) All are parasites.
(b) All of them have helical symmetry.
(c) They have ability to synthesize nucleic acids and proteins.
(d) Antibiotics have no effect on them. 
Answer. B

Question. Which one single organism or the pair of organisms is correctly assigned to its or their named taxonomic group?
(a) Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.
(b) Lichen is a composite organism formed from the symbiotic association of an algae and a protozoan.
(c) Yeast used in making bread and beer is a fungus.
(d) Nostoc and Anabaena are examples of protista.
Answer. C

Question. Virus envelope is known as
(a) capsid             
(b) virion
(c) nucleoprotein   
(d) core.
Answer. A

Question. T.O. Diener discovered a
(a) free infectious DNA     
 (b) infectious protein
(c) bacteriophage             
(d) free infectious RNA.
Answer. D

Question. There exists a close association between the alga and the fungus within a lichen. The fungus
(a) provides protection, anchorage and absorption for the algae
(b) provides food for the alga
(c) fixes the atmospheric nitrogen for the alga
(d) releases oxygen for the alga. 
Answer. A

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
(c) The genetic material in mature retroviruses is RNA.
(d) Retroviruses are causative agents for certain kinds of cancer in man. 
Answer. A

Question. Viruses that infect bacteria multiply and cause their lysis, are called
(a) lysozymes         
(b) lipolytic
(c) lytic               
 (d) lysogenic.
Answer. C

Question. Lichens are well known combination of an alga and a fungus where fungus has
(a) a saprophytic relationship with the alga
(b) an epiphytic relationship with the alga
(c) a parasitic relationship with alga
(d) a symbiotic relationship with alga.
Answer. D

Question. Which one of the following statements about viruses is correct ?
(a) Viruses possess their own metabolic system.
(b) All viruses contain both RNA and DNA.
(c) Viruses are obligate parasites.
(d) Nucleic acid of viruses is known as capsid.
Answer. C

Question. Tobacco mosaic virus is a tubular filament of size
(a) 300 × 10 nm     
(b) 300 × 5 nm
(c) 300 × 20 nm     
(d) 700 × 30 nm. 
Answer. C

Question. Viruses are no more “alive” than isolatedchromosomes because
(a) they require both RNA and DNA
(b) they both need food molecules
(c) they both require oxygen for respiration
(d) both require the environment of a cell to replicate. 
Answer. D

Ques. Cauliflower mosaic virus contains
(a) ss RNA       
(b) ds RNA
(c) ds DNA     
 (d) ss DNA
Answer. C

Question. Viruses possess
(a) ribosomes to synthesize protein
(b) organelle for its vital mechanism
(c) either DNA or RNA
(d) none of these. 
Answer. C

Question. Most of the lichens consist of
(a) green algae and ascomycetes
(b) brown algae and higher plant
(c) blue green algae and basidiomycetes
(d) red algae and ascomycetes. 
Answer. A

Question. What is the genetic material in influenza virus?
(a) Double helical DNA     
(b) RNA
(c) Single helix DNA           
(d) None of these 
Answer. B

Question. Which one of the following statement about lichens is wrong?
(a) These grow very rapidly (2 cm per day).
(b) They show fungal and algal symbiotic relationships.
(c) Some of its species are eaten by reindeers.
(d) These are pollution indicators. 
Answer. A

Question. The tailed bacteriophages are
(a) motile on surface of bacteria
(b) non-motile
(c) motile on surface of plant leaves
(d) actively motile in water. 
Answer. A

Question. Tobacco mosaic virus (TMV) genes are
(a) single stranded RNA
(b) double stranded DNA
(c) proteinaceous
(d) double stranded RNA. 
Answer. A

Question. Organisms which are indicator of SO2 pollution of air
(a) mosses           
(b) lichens
(c) mushrooms     
(d) puffballs. 
Answer. B

Question. Lichens indicate SO2 pollution because they
(a) show association between algae and fungi
(b) grow faster than others
(c) are sensitive to SO2
(d) flourish in SO2 rich environment.
Answer. C

Question. Who proposed two kingdom system of classification and named kingdom as Plantae and Animalia?
(a) CarlWoese
(b) RHWhittaker
(c) Carolus Linnaeus
(d) Herbert Copeland
Answer. C

Question. Which of the following statements given below is correct?
(a) Biological classification is the scientific ordering of organisms in a hierarchial series of groups on the basis of their relationships, i.e. morphological, evolutionary and others
(b) Whittaker classified organisms on the basis of autotrophic and heterotrophic mode of nutrition
(c) In five kingdom system of classification, living organisms can be divided into prokaryotic and eukaryotic cells on the basis of cell structure
(d) All of the above
Answer. D

Question. Which of the following characters served as the criteria for five kingdom system of classification proposed by Whittaker?
(a) Cell structure
(b) Body organisation and mode of nutrition
(c) Reproduction and phylogenetic relationships
(d) All of the above
Answer. D

Question. In Whittaker’s system of classification,prokaryotes are placed in the kingdom
(a) Plantae
(b) Protista
(c) Monera
(d) Animalia
Answer. C

Question. In the five kingdom classification,Chlamydomonas and Chlorella are included in
(a) Plantae
(b) Algae
(c) Protista
(d) Monera
Answer. A

Question.Consider the following statements with respect to characteristic features of the kingdom.
I. In Animalia, the mode of nutrition is autotrophic.
II. In Monera, the nuclear membrane is present.
III. In Protista, the cell type is prokaryotic.
IV. In Plantae, the cell wall is present.
Which of the above statements is/are correct?
(a) Only I
(b) Only II
(c) Only III
(d) Only IV
Answer. D

Question. Bacteria are grouped under four categories based on their shape. Refer to the given figure. Identify A, B, C and D.

(a) A–Vibrio, B–Cocci, C–Bacilli, D–Spirilla
(b) A–Cocci, B–Bacilli, C–Spirilla, D–Vibrio
(c) A–Bacilli, B–Spirilla, C–Vibrio, D–Cocci
(d) A–Spirilla, B–Vibrio, C–Cocci, D–Bacilli
Answer. B

Question.  Match the following columns.
Column I               Column II
(Names)              (Shape)
A. Coccus            1. Rod-shaped
B. Bacillus           2. Spherical
C. Vibrio             3. Spiral-shaped
D. Spirillum        4. Comma-shaped
Codes
     A B C D
(a) 3 2 1 4
(b) 4 3 2 1
(c) 2 1 4 3
(d) 1 4 3 2
Answer. C

Question. Some bacteria thrive in extreme environmental conditions such as the absence of oxygen, high salt concentration, high temperature and acidic pH. Identify the type of bacteria.
(a) Cyanobacteria
(b) Eubacteria
(c) Archaebacteria
(d) Mycobacteria
Answer. C

Question. Methanogens belong to
(a) Eubacteria
(b) Archaebacteria
(c) dinoflagellates
(d) slime moulds
Answer. B

Question. The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the
(a) thermoacidophiles
(b) methanogens
(c) Eubacteria
(d) halophiles
Answer. B

Question. Match the following columns.
Column I                          Column II
A. Halophiles                 1. Aquatic environment
B. Thermoacidophiles     2. Gut of ruminant
C. Methanogens             3. In hot springs
D. Cyanobacteria           4. Salty areas
Codes
     A B C D
(a) 1 4 3 2
(b) 3 2 1 4
(c) 2 1 4 3
(d) 4 3 2 1
Answer. D

Question. Eubacteria include
(a) blue-green algae and bacteria
(b) Archaebacteria and blue-green algae
(c) cyanobacteria and eukaryotes
(d) bacteria and eukaryotes
Answer. A

Question. The cyanobacteria are also referred to as
(a) protists
(b) golden algae
(c) slime moulds
(d) blue-green algae
Answer. D

Question. Given figure is of a filamentous blue-green algae. Identify the algae and choose the option that is correct for A, B and C in the figure.

(a) A–Gelidium, B–Vegetative cell,C–Heterocyst
(b) A–Volvox, B–Somatic cell,C–Mucilaginous sheath
(c) A–Chara, B–Mucilaginous sheath,C–Heterocyst
(d) A–Nostoc, B–Heterocyst,C–Mucilaginous sheath
Answer. D

Question. Which of the following bacteria plays an important role in the recycling of nutrients like nitrogen, phosphorus, iron and sulphur?
(a) Chemoheterotrophic bacteria
(b) Chemosynthetic autotrophic bacteria
(c) Parasitic bacteria
(d) Saprophytic bacteria
Answer. B

Question. Mostly found bacteria are
(a) chemosynthetic bacteria
(b) heterotrophic bacteria
(c) heterotrophic decomposers
(d) saprophytic bacteria
Answer. C

Question. Some of the cyanobacteria can fix atmospheric nitrogen in their specialised cells called
(a) akinetes
(b) heterocyst
(c) endospores
(d) homocyst
Answer. B

Question. Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
(a) Bacillus
(b) Pseudomonas
(c) Mycoplasma
(d) Nostoc
Answer. C

Question. Protists are eukaryotic and the mode of nutrition is both autotrophic and heterotrophic. The given statement is
(a) True
(b) False
(c) Cannot say
(d) Partially true or false
Answer. A

Question. Which of the following kingdoms have not well-defined boundaries?
(a) Plantae
(b) Protista
(c) Monera
(d) Algae
Answer. B

Question. Members of Protista are primarily
(a) terrestrial
(b) aquatic
(c) pathogenic
(d) photosynthetic
Answer. B

Question. Chrysophytes, euglenoids,dinoflagellates and slime moulds are included in the kingdom
(a) Protista
(b) Fungi
(c) Animalia
(d) Monera
Answer. A

Question. Which one of the following is a characteristic feature of group-Chrysophyta?
(a) They are parasitic forms which cause disease in animals
(b) They have a protein rich layer called pellicle
(c) They form diatomaceous earth on the sea floors
(d) They are commonly called dinoflagellates
Answer. C

Question. Which of the following organisms are known as chief producers in the oceans?
(a) Cyanobacteria
(b) Diatoms
(c) Dinoflagellates
(d) Euglenoids
Answer. B

Question. Which of the following groups of organisms is/are placed under the group–Chrysophyta?
(a) Diatoms only
(b) Desmids only
(c) Diatoms and golden algae
(d) Desmids and Paramecium
Answer. C

Question.  In which of the following groups, the cell wall has stiff cellulosic plate on the outer surface?
(a) Diatoms
(b) Red algae
(c) Dinoflagellates
(d) Slime moulds
Answer. C

Question. Which group of organisms is represented by the given figure?

(a) Dinoflagellates
(b) Protozoans
(c) Slime mould
(d) Euglenoids
Answer. D

Question. Which of the following statements about Euglena is true?
(a) Euglenoids bear flagella
(b) Euglena when placed in continuous darkness, loose their photosynthetic activity and die
(c) The pigments of Euglena are quite different from those of green plants
(d) Euglena is a marine protist
Answer. A

Question. Which one of the following is a saprophytic protist?
(a) Desmid
(b) Slime mould
(c) Euglena
(d) Nostoc
Answer. B

Question. Under favourable conditions slime moulds form
(a) protonema
(b) Plasmodium
(c) mycelium
(d) fruiting bodies
Answer. B

Question. Protozoans are divided into ………groups. Most suitable word to fill the blank is
(a) three
(b) four
(c) two
(d) eight
Answer. B

Question. Consider the following statements about amoeboid protozoans.
I. They live in freshwater, sea water or moist soil.
II. They have pseudopodia for locomotion and capturing prey.
III. They have silica shells on their surface in marine forms.
IV. Their body is covered by plasmalemma.
Which of the statements given above are correct?
(a) I and II
(b) III and IV
(c) II and III
(d) I, II, III and IV
Answer. D

Question. Which of the following is a flagellated protozoan?
(a) Amoeba
(b) Entamoeba
(c) Plasmodium
(d) Trypanosoma
Answer. D

Question. Ciliates differ from all other protozoans in
(a) using flagella for locomotion
(b) having two types of nuclei
(c) using pseudopodia for capturing prey
(d) having a contractile vacuole for removing excess water
Answer. B

Question. Which of the following groups always produce an infectious spore-like stage in their life cycle?
(a) Amoeboid protozoans
(b) Ciliated protozoans
(c) Flagellated protozoans
(d) Sporozoans
Answer. D

Question. Match the following columns.
      Column I               Column II
A. Chrysophytes        1. Gonyaulax
B. Dinoflagellates      2. Euglena
C. Euglenoids            3. Diatoms
D. Slime moulds        4. Plasmodium
Codes
     A B C D
(a) 1 3 2 4
(b) 1 4 2 3
(c) 3 2 4 1
(d) 3 1 2 4
Answer. D

Question. The cells of the body of a multicellular fungus are organised into rapidly growing individual filament called
(a) mycelium
(b) rhizoids
(c) hyphae
(d) lichens
Answer. C

Question. Cell wall of fungi is composed of
(a) chitin
(b) pectin
(c) cellulose
(d) mannans
Answer. A

Question. Match the following columns.
    Column I          Column II
A. Saprophyte     1. Symbiotic association of fungi with plant roots
B. Parasite          2. Decomposition of dead organic materials
C. Lichens          3. Grow on living plants or animals
D. Mycorrhiza     4. Symbiotic association of algae and fungi
Codes
A B C D
(a) 1 2 3 4
(b) 3 2 1 4
(c) 2 1 3 4
(d) 2 3 4 1
Answer. D

Question. In fungi, the fusion of protoplasms between two motile or non-motile gametes is called
(a) plasmogamy
(b) plasmokinesis
(c) karyogamy
(d) cytokinesis
Answer. A

Question. With respect to fungal sexual cycle,choose the correct sequence of events.
(a) Karyogamy, Plasmogamy and Meiosis
(b) Meiosis, Plasmogamy and Karyogamy
(c) Plasmogamy, Karyogamy and Meiosis
(d) Meiosis, Karyogamy and Plasmogamy
Answer. C

Question. Which of the following classes consists of coenocytic, multinucleate and aseptate mycelium?
(a) Basidiomycetes
(b) Ascomycetes
(c) Phycomycetes
(d) Deuteromycetes
Answer. C