CBSE Class 11 Biology Biological Classification MCQs Set 07

Question: The genetic material of virus includes
a) only RNA
b) only DNA
c) RNA and DNA both
d) RNA or DNA, i.e., one nucleic acid in a virus
Answer: d

Question: Which of the following is the smallest living cell and can live without oxygen?
a) Mycoplasma
b) Mycorrhiza
c) Euglena
d) Trypanosoma
Answer: a

Question: The given characters are seen in which of the following group?
(i) Unicellular, colonial, filamentous, marine or terrestrial forms
(ii) Colonies surrounded by gelatinous sheath
(iii) Some fix atmospheric nitrogen in heterocysts
(iv) Often form blooms in water bodies
a) Archaebacteria
b) Cyanobacteria
c) Chrysophytes
d) Dinoflagellates
Answer: b

Question: Which of the following is a parasitic fungi on mustard plant?
a) Albugo
b) Puccinia
c) Yeast
d) Ustilago
Answer: a

Question: Protists are
a) single-celled eukaryotes
b) multicellular eukaryotes
c) single-celled prokaryotes
d) single-celled akaryote
Answer: a

Question: Which of the following statement(s) is/are correct for bacteria?
a) They are members of kingdom Monera
b) They live in extreme habitats
c) They show the most extensive metabolic diversity
d) All of the above
Answer: d

Question: Clamp connection is found in
a) basidiomycetes
b) ascomycetes
c) saccharomycetes
d) haplomycetes
Answer: a

Question: Bladderwort and Venus fly trap are examples of
a) insectivorous plants
b) parasitic plants
c) N₂–rich plants
d) aquatic plants
Answer: a

Question: Which of the following statements is correct for both blue-green algae and bacteria?
a) Both show anaerobic respiration
b) Both have chlorophyll pigment
c) Both are devoid of true nucleus
d) None of the above
Answer: c

Question: Which arrangement is in correct ascending order?
a) Species < genus < order < family
b) Genus < species < family < order
c) Order < family < genus < species
d) Species < genus < family < order
Answer: d

Question: Which of the following statements is correct for archaea?
a) Archaea resemble eukaryotes in all respects
b) Archaea have novel features absent in other groups
c) Archaea completely differ from prokaryotes and eukaryotes
d) Archaea completely differ from prokaryotes
Answer: b

Question: The bacteria which oxidize inorganic substances and use released energy for synthesis of food are called
a) Archaebacteria
b) Heterotrophic bacteria
c) Photosynthetic autotrophic bacteria
d) Chemosynthetic autotrophic bacteria
Answer: d

Question: The given characters belong to which group of Protista?
(i) Mostly freshwater organisms
(ii) Flexible pellicle
(iii) Two flagella – one short, one long
(iv) Photosynthetic in light, heterotrophic in dark
a) Protozoans
b) Chrysophytes
c) Slime moulds
d) Euglenoids
Answer: d

Question: Which of the following pairs come under chrysophytes?
a) Diatoms and Euglena
b) Euglena and Trypanosoma
c) Diatoms and Desmids
d) Gonyaulax and Desmids
Answer: c

Question: Which scientist classified plants into herbs, shrubs and trees, and animals based on presence/absence of red blood cells?
a) Aristotle
b) R. H. Whittaker
c) D. J. Ivanowsky
d) W. M. Stanley
Answer: a

Question: Which of the following is not a viral disease?
a) AIDS and mumps
b) Smallpox and herpes
c) Influenza
d) Cholera
Answer: d

Question: The given statements describe which class of fungi?
(i) Unicellular or multicellular fungi
(ii) Septate hyphae
(iii) Conidia formed exogenously
(iv) Ascospores formed endogenously
(v) Ascocarp present
a) Phycomycetes
b) Sac fungi
c) Club fungi
d) Fungi imperfecti
Answer: b

Question: Which of the following characteristic(s) is/are used by Whittaker for classification?
a) Mode of nutrition
b) Thallus organisation
c) Phylogenetic relationships
d) All of the above
Answer: d

Question: Which of the following statement(s) is/are correct about ascomycetes?
(i) Neurospora used in genetic work
(ii) Mostly multicellular, yeast rarely unicellular
(iii) Saprophytic, parasitic or decomposers
(iv) Examples: Aspergillus, Claviceps, Neurospora
a) (i) & (ii)
b) (ii) only
c) (i), (iii) & (iv)
d) All of these
Answer: c

Question: Which statement is correct?
(i) Nutrition in Animalia is autotrophic
(ii) Nuclear membrane is present in Monera
(iii) Cell type of Protista is prokaryotic
(iv) Cell wall present in Plantae
a) (i) only
b) (ii) only
c) (iii) only
d) (iv) only
Answer: d

Question: Which of the following statement(s) is/are correct about class Basidiomycetes?
(i) Known as imperfect fungi
(ii) Grow on soil, logs, tree stumps or as parasites
(iii) Mycelium is branched and septate
(iv) Examples: Agaricus, Ustilago, Puccinia
a) Only (i)
b) (ii) and (iii)
c) (ii), (iii) and (iv)
d) All of these
Answer: c

Question: Which of the following statement(s) is/are correct about fungi reproduction?
(i) Vegetative reproduction by fragmentation, fission, budding
(ii) Fusion of nuclei is plasmogamy
(iii) Fusion of protoplasm is karyogamy
(iv) Meiosis in zygote forms diploid spores
a) Only (i)
b) (ii) and (iii)
c) (ii), (iii) and (iv)
d) All of these
Answer: a 

Question: Which of the following groups of protozoan is not correctly matched with its feature?
a) Amoeboid – Marine forms have silica shells on their surface.
b) Flagellated – Either free living or parasitic.
c) Ciliated – Actively moving organisms due to presence of cilia.
d) Sporozoans – Move and capture their prey with the help of false feet.
Answer: d

Question: Bacteria lack alternation of generation because there is
a) no conjugation.
b) neither syngamy nor reduction division.
c) no exchange of genetic material.
d) no distinct chromosomes.
Answer: b

Question: A virus can be considered a living organism because it
a) responds to touch stimulus
b) respires
c) reproduces (inside the host)
d) can cause disease
Answer: c

Question: When a moist bread is kept exposed in air, it becomes mouldy and black because
a) spores are present in the bread.
b) spores are present in the water.
c) spores are present in the air.
d) the bread decomposes.
Answer: c

Question: Ustilago causes plant diseases (called smuts) because
a) they parasitize on cereals.
b) they lack mycelium.
c) they develop sooty masses of spores.
d) their affected parts becomes completely black.
Answer: d

Question: Which of the following organisms is/are correctly assigned its/their taxonomic group?
a) Nostoc and Anabaena are examples of protista.
b) Lichen is a composite organism formed from the association of an alga and a protozoan.
c) Yeast used in making bread and beer is a fungus.
d) Paramecium and Plasmodium belong to the same kingdom as Penicillium.
Answer: c

Question: Food can be kept for a longer time in cold house than in normal conditions because
a) insect cannot enter.
b) bacterial multiplication stops.
c) bacterial multiplication is reduced.
d) there is plasmolysis at low temperature.
Answer: c

Question: The most abundant prokaryotes helpful to humans in making curd and producing antibiotics are
a) cyanobacteria
b) archaebacteria
c) chemosynthetic autotrophs
d) heterotrophic bacteria
Answer: d

Question: How many bacteria are produced in four hours if a bacterium divides once in half an hour?
a) 8
b) 64
c) 16
d) 256
Answer: d

Question: Two normal hyphal cells of different fungal mating types unite. After some time, the cell between them dissolves producing a
a) mycelium
b) fruiting body
c) zygote
d) dikaryotic cell, also heterokaryotic
Answer: d

Question: Bacteria and yeast are similar in all the following features except
a) both are unicellular.
b) both are prokaryotes.
c) both are capable of causing fermentation.
d) both produce spores.
Answer: b

Question: “X” reproduces so greatly that water appears red, producing red tides and killing marine animals “Z”. Identify X, Y, Z.
a) X–Gonyaulax; Y–Dinoflagellates; Z–Fishes
b) X–Paramecium; Y–Protozoa; Z–Crocodiles
c) X–Trypanosoma; Y–Protozoa; Z–Frogs
d) X–Plasmodium; Y–Euglenoids; Z–Oysters
Answer: a

Question: Which class of fungi lacks sex organs but plasmogamy occurs by fusion of vegetative cells of different strains?
a) Sac fungi
b) Bracket fungi
c) Imperfect fungi
d) Phycomycetes
Answer: b

Question. A scientist “X” demonstrated that extract of infected plants of “Y” could cause infection in healthy plants and called the fluid as “Contagium vivum fluidum”.
Identify X and Y.

          X                         Y
(a) W. M. Stanley        Potato
(b) M. W. Beijerinek    Tobacco
(c) D. J. Ivanowsky     Cauliflower
(d) Pasteur                Tomato
Answer: b