Biological Classification Exam Questions Class 11 Biology

Please see Chapter 2 Biological Classification Exam Questions Class 11 Biology below. These important questions with solutions have been prepared based on the latest examination guidelines and syllabus issued by CBSE, NCERT, and KVS. We have provided Class 11 Biology Exam Questions and answers for all chapters in your NCERT Book for Class 11 Biology. These solved problems for Biological Classification in Class 11 Biology will help you to score more marks in upcoming examinations.

Exam Questions Chapter 2 Biological Classification Class 11 Biology

Objective Questions

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

Question. Protists are
(a) single-celled eukaryotes.
(b) multicellular eukaryotes.
(c) single-celled prokaryotes.
(d) single-celled akaryote.

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

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

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

Question. Which of the following is/are example(s) of deuteromycetes?
(a) Alternaria
(b) Colletotrichum
(c) Trichoderma
(d) All of these

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

Question. Which of the following is not a viral disease ?
(a) AIDS and mumps
(b) Small pox and herpes
(c) Influenza
(d) Cholera

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.

Question. Clamp connection is found in
(a) basidiomycetes
(b) ascomycetes
(c) saccharomycetes
(d) haplomycetes

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

Question. The bacteria which oxidize various inorganic substances and use the released energy for the synthesis of food are called _______________.
(a) Archaebacteria
(b) Heterotrophic bacteria
(c) Photosynthetic autotrophic bacteria
(d) Chemosynthetic autotrophic bacteria

Statement Type Questions

Question. Which of the following statements is correct for archaea?
(a) Archaea resemble eukaryotes in all respects.
(b) Archaea have some novel features that are absent in other prokaryotes and eukaryotes.
(c) Archaea completely differ from both prokaryotes and eukaryotes.
(d) Archaea completely differ from prokaryotes.

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

Question. Which of the following statement is/ are correct for bacteria?
(a) They are the members of the kingdom monera.
(b) They live in extreme habitats such as hot springs, deserts, snow and deep oceans.
(c) They show the most extensive metabolic diversity.
(d) All of the above

Question. Which of the following statements is correct for dinoflagellates flagella ?
(a) A single flagellum lies in the transverse groove between the cell plates.
(b) A single flagellum lies in the longitudinal groove between the cell plates.
(c) Two flagella, one lies longitudinally and the other transversely in a furrow between the wall plates.
(d) Flagella are absent.

Question. Read the given statements and answer the question.
(i) It includes unicellular as well as multicellular fungi.
(ii) In multicellular forms, hyphae are branched and septate. 
(iii) Conidiophore produces conidia (spores) exogenously in chain.
(iv) Sexual spores are ascospores produced endogenously in chain.
(v) Fruiting body is called ascocarp.
Identify the correct class of fungi which have all the above given characteristics.
(a) Phycomycetes
(b) Sac fungi
(c) Club fungi
(d) Fungi imperfecti

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.
Of the above statements, which one is correct ?
(a) (i) only
(b) (ii) only
(c) (iii) only
(d) (iv) only

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

Question. The given statements are some characters of a particular group of Kingdom protista.
(i) Most of them are fresh water organisms found in standing water.
(ii) They have a protein rich layer (called pellicle) which makes their body flexible.
(iii) They have two flagella, a short and a long one.
(iv) Though they are photosynthetic in the presence of sunlight, but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms.
Identify the correct group on the basis of these characters.
(a) Protozoans
(b) Chrysophytes
(c) Slime moulds
(d) Euglenoids

Question. Which of the following statement(s) is/are correct about ascomycetes ?
(i) Neurospora, which is used in biochemical and genetic work is a member of this class.
(ii) They are mostly multicellular, e.g., Yeast, or rarely unicellular, e.g., Penicillium.
(iii) They are saprophytic, decomposers, parasitic or coprophilous.
(iv) Some examples are Aspergillus, Claviceps and Neurospora.
(a) Both (i) and (ii)
(b) Only (ii)
(c) (i), (iii) and (iv)
(d) All of these

Question. Which of the following statement(s) is/are correct about class basidiomycetes ?
(i) They are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known.
(ii) They grow in soil, on logs and tree stumps and in living plant bodies as parasites, e.g., rusts and smuts.
(iii) The mycelium is branched and septate.
(iv) Some common members are Agaricus, Ustilago and Puccinia.
(a) Only (i)
(b) Both (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) All of these

Question. Which of the following statement(s) is/are correct ?
(i) Reproduction in fungi can take place by vegetative means – fragmentation, fission and budding.
(ii) Fusion of two nuclei is called plasmogamy. 
(iii) Fusion of protoplasms between two motile or nonmotile gametes is called karyogamy.
(iv) Meiosis in zygote results in diploid spores.
(a) Only (i)
(b) Both (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) All of these

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : Euglena can be placed in the plant knigdom due to the presence of chlorophyll.
Reason : Euglena cannot be classified on the basis of two kingdom system of classification.

Question. Assertion : TMV is a virus which causes mosaic disease.
Reason : TMV has RNA as genetic material.

Question. Assertion : Yeasts such as Saccharomyces cerevisiae are used in baking industry.
Reason : Carbon dioxide produced during fermentation causes bread dough to rise by thermal expansion.

Matching Type Questions

Question. Match the terms given in column-I with their examples given in column-II and choose the correct option.

Column-I (Terms)	Column-II (Examples)
A. Ascus	I. Spirulina
B. Basidium	II. Penicillium
C. Protista	III. Agaricus
D. Cyanobacteria	IV. Euglena
E. Animalia	V. Sponges

(a) A – II, B – III, C – IV, D – V, E – I
(b) A – I, B – II, C – III, D – V, E – IV
(c) A – II, B – V, C – III, D – I, E – IV
(d) A – II, B – III, C – IV, D – I, E – V

Question. Match column I (Kingdom) with column II (Class) and select the correct options.

Column-I (Kingdom)	Column-II (Class)
A. Plantae	I. Archaebacteria
B. Fungi	II. Euglenoids
C. Protista	III. Phycomycetes
D. Monera	IV. Algae

(a) A – IV, B – III, C – II, D – I
(b) A – I, B – II, C – III, D – IV
(c) A – III, B – IV, C – II, D – I
(d) A – IV, B – II, C – III, D – I

Question. Match column I (containing fungus name) with column II (common name) and choose the correct options.

Column-I (Fungus name)	Column-II (Commonly called)
A. Puccinia	I. Yeast
B. Ustilago	II. Mushroom
C. Agaricus	III. Smut fungus
D. Saccharomyces	IV. Rust fungus

(a) A – I, B – II, C – III, D – IV
(b) A – II, B – III, C – IV, D – I
(c) A – III, B – IV, C – I, D – II
(d) A – IV, B – III, C – II, D – I

Question. Match column-I (Characters/feature) with column-II (examples) and choose the correct option.

Column-I (Characters/features)	Column-II (Examples)
A. Red dinoflagellates	I. Rhizopus
B. Unicellular fungi used to make bread and beer	II. Gonyaulax
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 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.

Diagram Type Questions

Question. Refer to the given figures of bacteria cell and Nostoc and choose the option which shows correct label for the structures marked as A, B, C, D and E ?

(a) A – Cell wall, B – Cell membrane, C – Heterocyst, D – DNA, E – Mucilagenous sheath
(b) A – Cell wall, B – Cell membrane, C – DNA, D – Heterocyst, E – Mucilagenous sheath
(c) A – Mucilagenous sheath, B – Cell membrane, C – DNA, D – Heterocyst, E – Cell wall
(d) A – Cell membrane, B – Cell wall, C – DNA, D – Heterocyst, E – Mucilagenous sheath

Question. Identify the figures A, B and C given below.

(a) A – Euglena, B – Paramecium, C – Agaricus
(b) A – Euglena, B – Planaria, C – Agaricus
(c) A – Planaria, B – Paramecium, C – Agaricus
(d) A – Euglena, B – Paramecium, C – Aspergillus

Question. The given figure shows the structure of filamentous blue green algae. Nostoc with a structure marked as “X”. Select the option which shows the correct identification of “X” with its feature.

(a) Spores – Reproduction
(b) Heterocysts – Nitrogen fixation
(c) Pellicle – Recycling of nutrition
(d) Mucilaginous sheath – Photosynthesis

Critical Thinking Type Questions

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

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. 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. 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. 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. 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. 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

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. 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. 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. 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. 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. 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