CBSE Class 11 Biology VBQs Biological Classification

Question. Many blue-green algae occur in thermal springs (hot-water springs). The temperature tolerance of these algae have been attributed to their
(a) mitochondrial structure
(b) importance of homopolar bonds in their proteins
(c) cell wall structure
(d) modern cell organization. 
Answer. C

Question. Organisms, which fix atmospheric nitrogen in the soil, fall under the category of
(a) bacteria     
(b) green algae
(c) soil fungi   
(d) mosses.
Answer. A

Question. Transduction in bacteria is mediated by
(a) plasmid vectors   
 (b) phage vectors
(c) cosmids               
(d) F-factors. 
Answer. B

Question. Genophore/bacterial genome or nucleoid is made of
(a) histones and non-histones
(b) RNA and histones
(c) a single double stranded DNA
(d) a single stranded DNA. 
Answer. C

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. A

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. A

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. A

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. A

Question. Which one belongs to Monera?
(a) Amoeba   
 (b) Escherichia
(c) Gelidium   
(d) Spirogyra 
Answer. B

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

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

Question. Select the wrong statement.
(a) The walls of diatoms are easily destructible.
(b) ‘Diatomaceous earth’ is formed by the cell walls of diatoms.
(c) Diatoms are chief producers in the oceans.
(d) Diatoms are microscopic and float passively in water. 
Answer. A

Question. Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the Kingdom
(a) Fungi       
 (b) Animalia
(c) Monera     
(d) Protista.
Answer. D

Question. In which group of organisms the cell walls form two thin overlapping shells which fit together?
(a) Dinoflagellates   
(b) Slime moulds
(c) Chrysophytes   
 (d) Euglenoids 
Answer. C

Question. Which one of the following organisms is not an eukaryote?
(a) Paramecium caudatum
(b) Escherichia coli     
(c) Euglena viridis
(d) Amoeba proteus
Answer. B

Question. Which one of the following is a slime mould?
(a) Physarum     
(b) Thiobacillus
(c) Anabaena     
(d) Rhizopus 
Answer. A

Question. Auxospores and hormogonia are formed, respectively, by
(a) some diatoms and several cyanobacteria
(b) some cyanobacteria and many diatoms
(c) several cyanobacteria and several diatoms
(d) several diatoms and a few cyanobacteria. 
Answer. D

Question. When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will
(a) increase in number   
 (b) disappear
(c) increase in size           
(d) decrease in size.
Answer. D

Question. The chief advantage of encystment of an Amoeba is
(a) the ability to survive during adverse physical conditions
(b) the ability to live for sometime without ingesting food
(c) protection from parasites and predators
(d) the chance to get rid of accumulated waste products. 
Answer. A

Question. In which of the following animals dimorphic nucleus is found?
(a) Amoeba proteus
(b) Trypanosoma gambiense
(c) Plasmodium vivax
(d) Paramecium caudatum 
Answer. D

Question. In protozoa like Amoeba and Paramecium, the organ for osmoregulation is
(a) contractile vacuole   
 (b) mitochondria
(c) nucleus                   
 (d) food vacuole. 
Answer. A

Question. Which of the following organisms possesses characteristics of a plant and an animal?
(a) Euglena         
(b) Paramecium
(c) Bacteria         
(d) Mycoplasma 
Answer. A

Question. The function of contractile vacuole, in protozoa, is
(a) osmoregulation 
(b) reproduction
(c) locomotion         
(d) digestion of food.
Answer. A

Question. Who divided the animals into 2 groups, those which had red blood and those that did not?
(a) Whittaker
(b) T.O. Diener
(c) Aristotle
(d) W.M. Stanley
Answer. C

Question. Basis of classification according to Whittaker
(a) Cell structure
(b) Mode of reproduction
(c) Phylogenetic relationship
(d) All of these
Answer. D

Question. Which of the following shows extensive metabolic diversity?
(a) Humans
(b) Fungi
(c) Snakes
(d) Blue - green algae
Answer. D

Question. Which of the following there is no mention in Whittaker’s classification?
(a) Virus
(b) Viroids
(c) Lichens
(d) All of these
Answer. D

Question. Four kingdom system of classification was proposed by:
(a) Whittaker
(b) Copeland
(c) Linnaeus
(d) Oswald Tippo
Answer. B

Question. Which of the following organisms were never included in Protista?
(a) Bacteria
(b) Red algae
(c) Slime moulds
(d) Mosses
Answer. D

Question. Biochemical resemblances are used in the identification of:
(a) Protistan species
(b) Moneran species
(c) Fungal species
(d) Higher plants
Answer. B

Question. Whittaker is famous for :-
(a) Two kingdom classification
(b) Four kingdom classification
(c) Five kingdom classification
(d) Distinguishing in Bacteria & blue gree Algae
Answer. C

Question. Which characteristic placed the fungi in a separate kingdom?
(a) Cell wall composition
(b) Cell wall structure
(c) Nutrition
(d) Nuclear membrane Monera 
Answer. A

Question. Peptidoglycan / Murein is present in the cell wall of
(a) Animals
(b) Plants
(c) Fungi
(d) Bacteria
Answer. D

Question. Match the following
(a) Peritrichous        1. One flagella at one end
(b) Monotrichous      2. Tuft of flagella at one end
(c) Amphitrichous     3. Two flagella at one end
(d) Lopptrichous       4. Present on entrire surface
(a) A-4 B-2 C-3 D-1
(b) A-4 B-3 C-2 D-1
(c) A-4 B-1 C-3 D-2
(d) A-4 B-2 C-1 D-3
Answer. C

Question. Old name of Blue green algae:
(a) Cyanobacteria
(b) Myxophyceae
(c) Spectrum algae
(d) None of these
Answer. B

Question. New name of Blue green algae:
(a) Chlorella
(b) Spirulina
(c) Cyanobacteria
(d) None of these
Answer. C

Question. Which of the following found in harsh habitat?
(a) Eubacteria
(b) Cyanobacteria
(c) Archaebacteria
(d) None of these
Answer. C

Question. Which of the following is aerobic in nature?
(a) Halophiles
(b) Methanogens
(c) Thermoacidophiles
(d) None of these
Answer. A

Question. Which of the pigment present in cyanobacteria?
(a) Chlorophyll ‘a’
(b) Chlorophyll ‘b’
(c) Chlorophyll ‘c’
(d) Xanthophylls
Answer. A

Question. Colonies of Eubacteria is surrounded by
(a) Polysaccharide sheath
(b) Gelatinous sheath
(c) Mucous sheath
(d) None of these
Answer. B

Question. Which of the following shows pendulum movement and fix atmospheric nitrogen?
(a) Nostoc
(b) Anabaena
(c) Oscillatoria
(d) Rhodospirillum
Answer. C

Question. Which of these is a bacterial disease?
(a) Chlorella
(b) Measles
(c) Citrus canker
(d) Both (a) & (c)
Answer. D

Question. Who is the Joker of plant kingdom?
(a) Mycoplasma
(b) Chlorella
(c) Chlamydomonas
(d) Spirullina
Answer. A

Question. Mycoplasma is:
(a) Insensitive to penicillin, sensitive to tetracycline
(b) Insensitive to tetracycline, sensitive to penicillin
(c) Sensitive to both penicillin & tetracycline
(d) None of these
Answer. A

Question. Plasmids was given by
(a) Tatum
(b) Lederberg
(c) Zinder
(d) Griffith
Answer. B

Question. Which type of plasmid contains Antibiotic resistance gene?
(a) “R”- factor
(b) “S”- factor
(c) “G” - factor
(d) “r” - factor
Answer. A

Question. Match the following
(a) Conjugation         1. Lederberg & Tatum
(b) Transformation     2. Zinder & Lederberg
(c) Transduction        3. Fredrick Griffith
(a) A-1 B-3 C-2
(b) A-3 B-1 C-2
(c) A-2 B-3 C-1
(d) A-2 B-1 C-3
Answer. B

Question. Ray fungi is a/an
(a) Eubacteria
(b) Algae
(c) Flower
(d) Fungi
Answer. A

Question.O2 does not evolve in the photosynthesis of
(a) BGA
(b) Green algae
(c) Bacteria
(d) Autotrophic plant
Answer. C

Question. Pigment present in cynobacteria is the
(a) r - phycocyanin
(b) r - phycoerythrin
(c) c - phycocyanin
(d) Anthocyanins
Answer. C

Question. The wall of bacteria consist of
(a) n - acetyl glucosamine
(b) n - acetyl muramic acid
(c) Both (a) & (b)
(d) Cellulose
Answer. C

Question. Which one of the following sets includes the bacterial diseases?
(a) Diptheria, Leprosy, Plague
(b) Tetanus, Tuberculosis, Measles
(c) Malaria, Mumps, Poliomyelitis
(d) Cholera, Typhoid, Mumps
Answer. A

Question. The folds of plasma membrane in bacterial cells are known as:
(a) Episomes
(b) Spherosomes
(c) Mesosomes
(d) Acrosomes
Answer. C

Question. A Dutch scientist (a)V. Leeuwenhoeck discovered bacteria for the first time in:
(a) Soil
(b) Rain water
(c) Air
(d) Garden soil
Answer. B

Question. Bacteria responsible for nitrificatin come under the following groups:
(a) Bacillus
(b) Vibrio
(c) Coccus
(d) Spirilla
Answer. A

Question. In cyanophyceae, flagella are:
(a) Present in zoospores only
(b) Present
(c) Present in gamete stage only
(d) Absent
Answer. D

Question. Bacteria were discovered by:
(a) Robert Koch
(b) (a)V. Leeuwenhoek
(c) Robert Hooke
(d) Louis Pasteur
Answer. B

Question. Diphtheria is caused by:
(a) Diplococcus
(b) Bacillus
(c) Corynebacterium
(d) Vibrio
Answer. C

Question. The main difference in Gram (+)ve and Gram (-)ve bacteria resides in their:
(a) Flagella
(b) Cell membrane
(c) Cytoplasm
(d) Cell wall
Answer. D

Question. Currently bacteria are included in:
(a) Thallophyta
(b) Monera
(c) Mycota
(d) Protista
Answer. B

Question. An obligate anaerobe is:
(a) Ulothrix
(b) Methane bacteria
(c) Spirogyra
(d) Onion
Answer. B

Question. Bacteria lack alternation of generations because there is:
(a) No exchange of genetic material
(b) Distinct chromosomes are absent
(c) No conjugation
(d) Neither syngamy nor reduction division
Answer. D

Question. Endospores develop in:
(a) Bacillus and Clostridium
(b) Saccharomyces and Clostridium
(c) Mnococcus and Clostridium
(d) Mucor and Bacillus
Answer. A

Question. Streptococcus is used in preparation of:
(a) Wine
(b) Cheese
(c) Idli
(d) Bread
Answer. B

Question. Match the columns and find the correct answer:
Column I                   Column II
(a) Streptomyces     1. Food poisoning
(b) Rhizobium          2. Source antibiotics
(c) Nitrosomonas     3. Nitrogen fixation
(d) Acetobacter        4. Nitrification
                             5. Vinegar synthesis
(a) A-2 B-3 C-4 D-5
(b) A-5 B-2 C-3 D-4
(c) A-2 B-3 C-1 D-5
(d) A-4 B-5 C-1 D-3
Answer. A

Question. Murein does not occur in the wall of:
(a) Blue green algae
(b) Nostoc
(c) Eubacteria
(d) Diatoms
Answer. D

Question. Entamoeba coil causes:
(a) None
(b) Diarrhoea
(c) Dysentery
(d) Pyorrhoea
Answer. A

Question. Infection of Entamoeba histolytica is prevented by:
(a) Uncontaminated food
(b) Avoiding clothes of patient
(c) Avoiding kissing
(d) None of the above
Answer. A

Question. Recurrence of high temperature in malaria at intervals is due to completion of:
(a) Exoerythrocytic schizogony
(b) Sporogony
(c) Gamogony
(d) Erythrocytic schizogony
Answer. D

Question. Euglena stores food as:
(a) Paramylum
(b) Starch
(c) Fat
(d) Protein
Answer. A

Question. Which of the following can be used as bacteriological filter?
(a) Cymbella
(b) Batrachospermum
(c) Oscillatoria
(d) Gelidium
Answer. A

Question. What is not true of Euglena?
(a) Presence of cellulose cell wall
(b) Presence of proteinaceous pellicle
(c) Presence of chlorophyll
(d) Presence of flagellum
Answer. A

Question. Chief producers in oceans are
(a) Diatoms
(b) Desmids
(c) Archaebacteria
(d) All of these
Answer. A

Assertion-Reasoning MCQs

Direction- Each of these questions contains two statements Assertion (A) and Reason (R). Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true

Question. Assertion (A) The two kingdom classification, used for a long time, was found to be inadequate.
Reason (R) Two kingdom system of classification did not distinguish between the eukaryotes and prokaryotes, unicellular and multicellular organisms and green algae and fungi.
Answer. A

Question. Assertion (A) Three domains system classifies organisms based on cellular characteristics.
Reason (R) The three domains are, i.e. Archaea, Bacteria and Eukarya.
Answer. B

Question. Assertion (A) Five kingdom system of classification did not differentiate between the heterotrophic group, fungi and the autotrophic green plants.
Though they showed a characteristic difference in their cell wall composition.
Reason (R) Fungal cell wall contains chitin, while green plants have a cellulosic cell wall.
Answer. D

Question. Assertion (A) Polluted water bodies have high abundance of Nostoc and Oscillatoria.
Reason (R) These blue-green bacteria can tolerate adverse conditions very well compared to other aquatic plants.
Answer. A

Question. Assertion (A) Euglena is a plant due to the presence of chlorophyll.
Reason (R) Euglena cannot be classified on the basis of two kingdom system.
Answer. D

Question.Assertion (A) Slime moulds are called as fungus like animals.
Reason (R) These do not have cell wall
Answer. C

Question. Assertion (A) Fungi are wide spread in distribution and they can even live on or inside other plants and animals.
Reason (R) Fungi are able to grow anywhere on land, water or on other organisms because they have variety of pigments including chlorophyll,carotenoids, fucoxanthin and phycoerythrin.
Answer. C

Question. Assertion (A) In fungi, sexual apparatus decreases in complexity from lower to higher forms.
Reason (R) In algae, sexual apparatus increases in complexity from simple to higher forms.
Answer. B

Question. Assertion (A) Viruses can contribute to various types of cancer in humans.
Reason (R) It can be estimated that 15% of all cancer cases related to humans, throughout the world are due to viruses.
Answer. B

Question. Assertion (A) Viruses cause diseases and replicate when they are in the host cell.
Reason (R) Viruses do not replicate outside the host, but they survive in environment.
Answer. B

Case Based MCQs

Direction Read the following and answer the questions that follow

The members of kingdom–Fungi are eukaryotic, heterotrophic and achlorophyllous. They are either unicellular or multicellular forms that are made up of hyphae. The network of hyphae forms the mycelium. These cell wall exhibiting organisms reproduce by both sexual and asexual modes. On the basis of spore formation, fungi are classified as Phycomycetes, Ascomycetes, Basidiomycetes and Deuteromycetes. Based on the mode of nutrition, fungi are classified as saprophytic and parasitic forms. These are also found in symbiotic association with plants.

Question. Fungal cell wall is composed of
(a) cellulose and pectins
(b) chitin and glycoproteins
(c) chitin, glycoproteins and glucans
(d) pectins, chitin and cellulose
Answer. C

Question. Club-fungi is
(a) Phycomycetes
(b) Deuteromycetes
(c) Basidiomycetes
(d) Ascomycetes
Answer. C

Question. The spores that help fungi to undergo asexual reproduction during favourable conditions is
(a) zoospores
(b) aplanospores
(c) conidia
(d) All of these
Answer. D

Question. Sexual reproduction in Ascomycetes occurs through
(a) somatogamy of zoospores
(b) isogamy of zoospores
(c) anisogamy of ascospores
(d) Both (b) and (c)
Answer. C

Question. Assertion (A) Mycelium in Deuteromycetes is aseptate.
Reason (R) Phycomycetes possess septate and branched mycelium.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) Both A and R are false
Answer. D

Direction Read the following and answer the questions that follow

Viruses are non-cellular organisms that are characterised by an inert crystalline structure surrounding the genetic material. These are obligate parasites and do not have a biosynthetic machinery. Therefore, they use host machinery to replicate themselves.
Viruses are ultramicroscopic nucleoprotein entities having variable size and shape. The basic structure of virus is composed of envelope, capsid and nucleoid. Based on the type of genetic mateial, viruses are classified as Deoxyvira and Ribovira.

Question. All the listed viruses contain DNA, except
(a) cauliflower mosaic virus
(b) polio virus
(c) rabies virus
(d) retrovirus
Answer. A

Question. Capsid of viruses
(a) surrounds the genetic material
(b) is proteinaceous
(c) composed of several capsomeres
(d) All of the above
Answer. D

Question. A polyhedral-shaped virus is
(a) Alfalfa mosaic virus
(b) Poliomyelitis virus
(c) TMV
(d) All of the above
Answer. B

Question. Viroids differ from viruses in
(a) having protein coat
(b) lacking protein coat
(c) having DNA
(d) having both DNA and RNA
Answer. B

Question. Assertion (A) Coliphages and cyanophages are bacterial viruses.
Reason (R) Envelope of viruses is composed of RNA.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) Both A and R are false
Answer. C

Observe the diagram shown below and answer the following questions.

Question. ​​​​​Find out the labels A, B, C and D in the shown figure.
(a) A–Plasma memberne, B-Cell wall, C–RNA,D–Spore formation
(b) A–Cell wall, B-Cell membrane, C–DNA,D–Binary fission
(c) A–Plasma membrane, B–Mucilaginous,C–DNA, D–Transformation
(d) A–Mucilaginous, B–Cell membrane, C–RNA,D–Conjugation
Answer. B

Question. Some hyperthermophilic organisms that grow in highly acidic (pH = 2) habitats belong to the two groups, viz,
(a) Eubacteria and Archaea
(b) cyanobacteria and diatoms
(c) Protists and mosses
(d) Liverworts and yeasts
Answer. A

Question. Cell wall of bacteria is composed of
(a) complex lipids
(b) lipids
(c) mucopeptide complex
(d) lipoprotein
Answer. C

Question. Select the incorrect statement.
(a) Bacterial cell wall is made up of peptidoglycans
(b) Pili and fimbriae are mainly involved in motility of bacterial cells
(c) Cyanobacteria lack flagellated cells
(d) Mycoplasma is wall-less microorganism
Answer. B

Question. Why is a capsule advantageous to a bacterium?
(a) It protects the bacterium from desiccation
(b) It provides means of locomotion
(c) It allows bacterium to ‘hide’ from host’s immune system
(d) It allows the bacterium to attach to the surface
Answer.C

Observe the diagram shown below and answer the following questions.

Question. Identify the correct characteristics about the fungal reproduction shown above.
I. It is a type of asexual reproduction.
II. The structure A is sporangium.
III. It is seen in Rhizopus and Mucor.
IV. Structure A contains endospores.
(a) II and IV
(b) I, II, III and IV
(c) I and III
(d) Only IV
Answer. B

Question. Fungal species that reproduce by zoospore is
(a) Albugo
(b) Penicillium
(c) Rhizopus
(d) Mucor
Answer. A

Question. The type of asexual spores in Rhizopus is
(a) sporangiospores
(b) arthrospores
(b) chlamydospores
(d) All of these
Answer. D

Question. Sexual spores in fungi is/are
(a) ascospores
(b) chlamydospores
(c) sporangiospores
(d) All of the above
Answer. A

Question. Dikaryotisation in fungi occurs during
(a) meiosis
(b) karyogamy
(c) plasmogamy
(d) Both (b) and (c)
Answer. C

Questions. Mohan has observed that the water logged areas in his neighbourhood produces a particular odour.
(a) Name the gas that is produced by the marshy areas and the microorganisms responsible for that. 
(b) Could this gas be an environmental threat? Why? 
Answer. (a) Methane-Methanogens
(b) Yes, because methane gas is a green house gas which causes global warming.

Questions. Some people in the village fell sick after eating mushrooms which they collected from the forest. What could be the cause for their sickness? What advice would you give them to avoid such incidences in future. 
Answer. The mushrooms that the villagers ate must be poisonous. Not all mushrooms are edible ,
some are poisonous. Avoid colourful toadstools and eat only white colouredAgaricus.

Questions. An epidemic of chicken pox in the village made people panic and do special offerings to the deity. As a student of biology how would you make them realize that the disease is not caused due to the displeasure of the gods?
Answer. ​​I would explain to them that chicken pox is caused by viruses which are obligate parasites.They are found to be living only inside a host cell. Preventive measures would help them in controlling the spread of the disease.