MCQ Chapter 2 Biological Classification Class 11 Biology

Please refer to Biological Classification MCQ Questions Class 11 Biology below. These MCQ questions for Class 11 Biology with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Biological Classification will help you to prepare for the exams and get more marks.

Biological Classification MCQ Questions Class 11 Biology

Please see solved MCQ Questions for Biological Classification in Class 11 Biology. All questions and answers have been prepared by expert faculty of standard 11 based on the latest examination guidelines.

MCQ Questions Class 11 Biology Biological Classification

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

Question- Citrus canker is caused by 
(a) bacterium
(b) fungus
(c) alga
(d) virus

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

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) phycomycetes
(b) zygomycetes
(c) deuteromycetes
(d) basidiomycetes

Question- “Fairy rings” in lawns result from outward,spreading circles of mycelia of mushrooms producing, at their periphery, fruiting bodies called 
(a) ascocarps
(b) basidiocarps
(c) sorocarps
(d) pseudocarps

Question-Mycorrhizae are useful for plants because they
(a) fix atmospheric nitrogen.
(b) enhance absorption of nutrients from the soil.
(c) kill insects and pathogen.
(d) provide resistance against abiotic stresses.

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

Question- In some viruses, RNA is present instead of DNA indicating that
(a) their nucleic acid must combine with host DNA before replication.
(b) they cannot replicate.
(c) there is no hereditary information.
(d) RNA can transfer heredity material.

Question- Cell wall is absent in
(a) Amoeba
(b) Chara
(c) yeast
(d) E. coli

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

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 To        bacco
(c) D. J. Ivanowsky                Cauliflower
(d) Pasteur                            Tomato

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

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

Question- Myxomycetes are 
(a) saprobes or parasites, having mycelia,asexual reproduction by fragmentation.
(b) slimy mass of multinucleate protoplasm,having pseudopodia like structures for engulfing food, reproduction through fragmentation or zoospores.
(c) prokaryotic organisms, cellular or acellular, saprobes or autotrophic, reproduce by binary fission.
(d) eukaryotic, single-celled or filamentous,saprobes or autotrophic, asexual reproduction by division of haploid individuals, sexual reproduction by fusion of two cells or their nuclei.

Question- Among rust, smut and mushroom all the three
(a) are pathogens
(b) are saprobes
(c) bear ascocarps
(d) bear basidiocarps

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) Sac fungi
(b) Bracket fungi
(c) Imperfect fungi
(d) Phycomycetes

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

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

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.

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)

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

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

Question- Fungi show asexual reproduction by all of the following kinds of spores except
(a) conidia
(b) oospores
(c) sporangiospores
(d) zoospores

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

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.

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

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

Question- An “X” reproduces in such a great numbers that the water may appear, producing a red tides and kills large marine animals like “Z”. “X” belongs to “Y”. Identify “X”, “Y” and “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

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.

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

Question- Which of the following organisms is\are correctly assigned its/their 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 alga and a protozoan.
(c) Yeast used in making bread and beer is a fungus.
(d) Nostoc and Anabaena are examples of protista.

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

Question- Bacteria are found to be primitive organisms because they
(a) are small, microscopic which are not seen with naked eye.
(b) cause serious diseases to human being, domestic animals and crop plants.
(c) produce endospores which are very resistant to adverse conditions.
(d) possess incipient nucleus and show amitotic division.

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

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.

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

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

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

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

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) mycelium
(b) fruiting body
(c) zygote
(d) dikaryotic cell, which is also heterokaryotic

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

Question- Protozons are not included in kingdom animalia because they are
(a) mostly asymmetrical.
(b) unicellular eukaryotes.
(c) heterotrophic in nature.
(d) multicellular prokaryotes.

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

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

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

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 – Monera ; Y – Protista
(b) X – Basidiomycetes ; Y – Phycomycetes
(c) X – Ascomycetes ; Y – Basidiomycetes
(d) X – Phycomycetes ; Y – Archaebacteria

Question- Hormogonia are vegetative reproductive structure of 
(a) Spirogyra
(b) Ulothrix
(c) Oscillatoria
(d) Yeast

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

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

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