CBSE Class 11 Biology Biological Classification MCQs Set F

Question: Fungi are filamentous with the exception of “X” which is unicellular. Identify X.
a) Albugo
b) Lichen
c) Yeast
d) Mucor
Answer: c

Question: Which of the following pairs is not correctly matched?
a) Albugo – Chrysophytes
b) Amoeba – Protozoa
c) Anabaena – Cyanobacteria
d) Gonyaulax – Dinoflagellates
Answer: a

Question: Cell wall is absent in
a) E. coli
b) Amoeba
c) Chara
d) Yeast
Answer: b

Question: Which pair of the following belongs to Basidiomycetes?
a) Birds nest fungi and puffballs
b) Peziza and Alternaria
c) Morchella and mushrooms
d) Puffballs and Claviceps
Answer: a

Question: Citrus canker is caused by
a) Fungus
b) Bacterium
c) Virus
d) Alga
Answer: b

Question: “Fairy rings” in lawns result from outward-spreading circles of mycelia of mushrooms producing, at their periphery, fruiting bodies called
a) Sorocarps
b) Basidiocarps
c) Ascocarps
d) Pseudocarps
Answer: b

Question: Mycorrhizae are useful for plants because they
a) Enhance absorption of nutrients from the soil
b) Kill insects and pathogens
c) Fix atmospheric nitrogen
d) Provide resistance against abiotic stresses
Answer: a

Question: A virus can be considered a living organism because it
a) Can cause disease
b) Reproduces (inside the host)
c) Respires
d) Responds to touch stimulus
Answer: b

Question: Pullorum disease of poultry is caused by
a) Clostridium
b) Salmonella
c) Mycobacterium
d) Haemophilus
Answer: b

Question: Which is a unicellular fungus?
a) Yeast
b) Nostoc
c) Albugo
d) E. coli
Answer: a

Question: In some viruses, RNA is present instead of DNA indicating that
a) RNA can transfer hereditary material
b) They cannot replicate
c) Their nucleic acid must combine with host DNA before replication
d) There is no hereditary information
Answer: a

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

Question: A fungus contains cells with two nuclei from different genomes. The nuclei do not fuse but divide independently and simultaneously as new cells are formed. This fungus belongs to
a) Basidiomycetes
b) Deuteromycetes
c) Zygomycetes
d) Phycomycetes
Answer: a

Question: Myxomycetes are
a) Slimy mass of multinucleate protoplasm with pseudopodia-like structures for engulfing food and reproducing through fragmentation or zoospores
b) Saprobic or parasitic having mycelia with asexual reproduction by fragmentation
c) Prokaryotic organisms reproducing by binary fission
d) Eukaryotic single-celled or filamentous saprobes with asexual division of haploid individuals
Answer: a

Question: Among rust, smut and mushroom all the three
a) Are saprobes
b) Are pathogens
c) Bear basidiocarps
d) Bear ascocarps
Answer: c

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

Question: Which class of fungi lacks sex organs but the process of plasmogamy is brought about by fusion of two vegetative or somatic cells of different strains or genotypes?
a) Imperfect fungi
b) Bracket fungi
c) Sac fungi
d) Phycomycetes
Answer: a

Question: Which of the following is a fungus?
a) Chara
b) Nostoc
c) E. coli
d) Yeast
Answer: d

Question: Bacterial cell wall is composed of peptidoglycan, a complex of oligosaccharides and proteins. The oligosaccharide component consists of
a) Linear chains of alternating NAG and NAM linked by β (1–4) linkage
b) Linear chain of glucose linked by β(1–4) linkage
c) Linear chain of glucose linked by α(1–4) linkage
d) Linear chain of alternating NAG and NAM linked by α(1–4) linkage
Answer: a

Question: Virus has
a) both (a) and (b)
b) DNA
c) either DNA or RNA
d) RNA
Answer: c

Question: Which of the following statements regarding cyanobacteria is incorrect?
a) It forms blooms in polluted water bodies.
b) It is unicellular, colonial or filamentous.
c) It is also called blue green algae.
d) They are chemosynthetic heterotrophs.
Answer: d

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

Question: Protozoans are not included in kingdom Animalia because they are
a) multicellular prokaryotes.
b) mostly asymmetrical.
c) unicellular eukaryotes.
d) heterotrophic in nature.
Answer: c

Question: The symbiotic relationship of algae and fungus is found in
a) bacteriophage
b) mycorrhiza
c) lichen
d) pneumatophore
Answer: c

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

Question: Which one of the following statements is correct?
a) Viroids consist of single-stranded RNA molecule.
b) Rickettsiae lack cell wall.
c) The cell wall of Mycoplasmas is made up of amino sugars.
d) Prions are the smallest free-living cells.
Answer: a

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

Question: Viroids have
a) single stranded RNA not enclosed by protein coat.
b) single stranded DNA not enclosed by protein coat.
c) double stranded RNA enclosed by protein coat.
d) double stranded DNA enclosed by protein coat.
Answer: a

Question: Bacterial cell wall is made up of
a) xylan
b) cellulose
c) chitin
d) murein
Answer: d

Question: Powdery mildews of crops are caused by
a) ascomycetes
b) basidiomycetes
c) bacteria
d) phycomycetes
Answer: a

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

Question: Which of the following is a cyanobacterium?
a) Nostoc
b) Polysiphonia
c) Chara
d) E. coli
Answer: a

Question: An “X” reproduces in such great numbers that the water may appear red, producing red tides and killing large marine animals like “Z”. “X” belongs to “Y”. Identify “X”, “Y” and “Z”.
a) X – Gonyaulax; Y – Dinoflagellates; Z – Fishes
b) X – Plasmodium; Y – Euglenoids; Z – Oysters
c) X – Trypanosoma; Y – Protozoa; Z – Frogs
d) X – Paramecium; Y – Protozoa; Z – Crocodiles
Answer: a

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

Question: A specimen of fungus is brought by a student for identification. Upon close examination, he discovered that its hyphae are completely septate and it has gills on the underside of the pileus. To which fungal group does it most likely belong?
a) Basidiomycetes
b) Zygomycetes
c) Ascomycetes
d) Chytrids
Answer: a

Question: Bacteria are found to be primitive organisms because they
a) cause serious diseases to humans and crops.
b) are small microscopic organisms.
c) produce endospores resistant to adverse conditions.
d) possess incipient nucleus and show amitotic division.
Answer: d

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

Question: Which of the following is the correct sequence of three steps in the sexual cycle of fungi?
a) Plasmogamy → Karyogamy → Meiosis
b) Karyogamy → Plasmogamy → Meiosis
c) Mitosis → Meiosis → Fertilization
d) Mitosis → Plasmogamy → Karyogamy
Answer: a

Question: Assume that two normal hyphal cells of different fungal mating types unite. After a period of time, the cell between these cells will dissolve producing a
a) fruiting body
b) zygote
c) dikaryotic cell, which is also heterokaryotic
d) mycelium
Answer: c

Question: Hormogonia are vegetative reproductive structures of
a) Spirogyra
b) Ulothrix
c) Yeast
d) Oscillatoria
Answer: d

Question: The virus that infects bacteria is called
a) cyanophage
b) bacteriophage
c) mycophage
d) none of these
Answer: b

Question: The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as
a) archaebacteria
b) chemosynthetic autotrophs
c) cyanobacteria
d) heterotrophic bacteria
Answer: d

Question: Which of the following statements is not correct for viruses?
a) Viruses can multiply only when they are inside living cells.
b) Viruses are made up of protein and DNA or RNA (never both).
c) Viruses cannot pass through bacterial filters.
d) Viruses are obligate parasites.
Answer: c

Question: Refer to the statement and answer the question. “Once the sexual stage of members of Deuteromycetes were discovered, they were often moved to X and Y.” Identify X and Y.
a) X – Ascomycetes ; Y – Basidiomycetes
b) X – Phycomycetes ; Y – Archaebacteria
c) X – Monera ; Y – Protista
d) X – Basidiomycetes ; Y – Phycomycetes
Answer: a

Question: Identify the basis of classification of fungi into phycomycetes, ascomycetes, basidiomycetes and deuteromycetes.
i. Fruiting bodies
ii. Nature of habitat
iii. Morphology of mycelium
iv. Mode of spore formation
(a) i & ii only
(b) ii & iii only
(c) i, iii, & iv only
(d) All of these
Answer: c

Question: Which of the following is correct about the slime mould ?
(i) Its thalloid body, Plasmodium has pseudopodia for locomotion and engulfing organic matter.
(ii) During unfavourable conditions Plasmodium differentiates and produces fruiting bodies, sporangium.
(iii) Spores posses no true cell wall.
(iv) They are dispersed by air current.
(v) Being extremely resistant, spores survive for many years.
(vi) Plasmodium can grow upto several feet.
Choose the answer from the following options
(a) (i),(ii), (iv), (v) and (vi)
(b) (i),(ii) and (iii)
(c) (i),(ii), (iii) and (vi)
(d) (ii),(iii) and (vi)
Answer: a

Question: (i) Green algae occur in fresh water, brackish water, salt water.
(ii) Habitat of Brown algae-fresh water (rare), brackish water, salt water
(iii) Some red algae are found in fresh water, mostly occur in salt water, some are in brackish water.
(iv) Most of the red algae are multicellular.
(v) Red alga may occur in both well lighted regions close to water-surface and also at great depths in oceans where light penetration is little.
(vi) Cell wall of red algae consists of cellulose + agar.
(vii) 2 – 8, equal and apical flagella in green algae
(a) All are correct
(b) All are false
(c) (i) and (vi) are correct
(d) (ii), (iii) and (v) are correct
Answer: a

Question: Match column-I (Characters/feature) with column-II (examples) and choose the correct option.
  Column-I                                   Column-II
(Characters/features)                  (Examples)
A. Red dinoflagellates                 I. Rhizopus
B. Unicellular fungi used to         II. Gonyaulax
    make bread and beer
C. Source of antibiotics             III. Yeast
D. Bread mould                         IV. Penicillium
(a) A – III, B – II, C – I, D – IV
(b) A – II, B – III, C – I, D – IV
(c) A – II, B – III, C – IV, D – I
(d) A – II, B – IV, C – III, D – I
Answer: c

Question: Match column-I with column-II and select the option .
   Column-I                      ​​​​​​​       ​​​​​​​Column-II
  (Classes of fungi)           (Common name)
A. Phycomycetes            I. Sac fungi
B. Ascomycetes             II. Algal fungi
C. Basidiomycetes         III. Fungi imperfecti
D. Deuteromycetes        IV. Club fungi
The correct combination is –
(a) A – II; B – I; C – IV; D – III
(b) A – II; B – IV; C – I; D – III
(c) A – IV; B – I; C – II; D – III
(d) A – IV; B – III; C – II; D – I
Answer: a