Please refer to Biological Classification Class 11 Biology Important Questions with answers below. These solved questions for Chapter 2 Biological Classification in NCERT Book for Class 11 Biology have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these solved problems properly as these will help them to get better marks in your class tests and examinations. You will also be able to understand how to write answers properly. Revise these questions and answers regularly. We have provided Notes for Class 11 Biology for all chapters in your textbooks.

Important Questions Class 11 Biology Chapter 2 Biological Classification

Higher Order Questions

Question. Pulmonary tuberculosis is caused by
a. Escherichia coli
b. Pseudomonas aeruginosa
c. Mycobacterium
d. Streptococcus pneumoniae

Question. Subterranean masses of hyphae which pass the unfavourable periods in dormant stage are known as
a. Sclerotia
b. Mycelium
c. Rhizomorph
d. Puff balls

Question. Small proteins produced by vertebrate cells naturally in response to viral infections and which inhibit multiplication of viruses are called
a. Immunoglobulins
b. Interferons
c. Antitoxins
d. Lipoproteins

Question. The first life on earth consisted of
a. Provirus
b. Protovirus
c. Virus
d. Bacteria

Question. In bacteria, the site for respiratory activity is found in:
a. Episome
b. Microsome
c. Ribosome
d. Cell membrane

Question. Toxin is secreted during storage condition by
a. Fusarium
b. Colletotrichum
c. Penicillium
d. Aspergillus

Question. Litmus dye is made from
a. Fungi
b. Bacteria
c. Algae
d. Lichens

Question. Which of the following statement is correct w.r.t above diagram?

a. ‘A’ is mucilaginous sheath and is also found in Rivularia
b. ‘A’ is mucilaginous sheath and is also found in Anabaena
c. ‘A’ is heterocyst and is also found in methanogens
d. ‘A’ is heterocyst and is also found in Anabaena

Question. Match the columns and find out the correct combination:

A. Cleistothecium	1. Saucer-shaped ascocarp
B. Perithecium	2. Basidiocarp
C. Apothecium	3. Flask-shaped ascocarp
D. Puffballs	4. Closed globose ascocarp

a. A-4 B-3 C-1 D-2
b. A-4 B-3 C-2 D-1
c. A-3 B-4 C-1 D-2
d. A-3 B-1 C-2 D-4

Question. Match the columns and find out the correct combination:

A. Red rot	1. Ustilago
B. Smut	2. Puccinia
C. Rust	3. Colletotrichum
D. Early blight	4. Albugo
	5. Alternaria

a. A-4 B-3 C-1 D-2
b. A-4 B-3 C-2 D-1
c. A-3 B-1 C-2 D-5
d. A-3 B-5 C-2 D-4

Question. Which of the following statement about Mycoplasma is true?
a. They are smallest, disease causing thin walled organisms.
b. They differ from viruses in being cellular in organization.
c. Insensitive to several antibiotics as they have 70S ribosomes.
d. They can survive without photosynthetic pigments and genetic material.

Question. Incorrect statement is:
a. Mycoplasma plays a significant role in the evolution of aerobic forms of life.
b. Tolypothrix and Aulosera fixes N₂ non-symbiotically in rice fields.
c. Anabaena, Microcystis and Aphanizomenon are known to cause algal blooms.
d. Bryophytes (liverworts) are first archegoniates.

Question. Identify true statements about archaebacteria.
A. They can live in harsh habitats.
B. Cell walls do not contain peptidoglycon.
C. Cell membrane contains branched chain lipids.
D. Some of them are capable of producing biogas.
a. A & B only
b. A, B & C only
c. B & C only
d. All of these

Question. Kingdom Animalia is characterized by
a. Unicellular, prokaryotic and autotrophic
b. Multicellular, eukaryotic and heterotrophic
c. Multicellular, prokaryotic and saprophytic
d. Unicellular, eukaryotic and heterotrophic

Question. In plants, mosaic formation, leaf rolling and curling, yellowing of plant parts, vein clearing, dwarfing and stunted growth, necrosis, etc., are the symptoms of
a. Bacterial diseases
b. Mycoplasmal diseases
c. Viral diseases
d. Fungal diseases

Question. Virus could be crystallized and crystals consist largely of proteins. This was shown by
a. W. M. Stanley
b. M. W. Stanley
c. W. M. John
d. None of these

Question. Those viruses infect plants have which type of genetic material?
a. Single stranded DNA
b. Single stranded RNA
c. Double stranded RNA
d. Double stranded DNA

Question. Genetic material of bacteriophage
a. Double stranded DNA
b. Single stranded RNA
c. Double stranded RNA
d. Single stranded DNA

Question. Lichens are very good pollution indicator because they are sensitive to
a. Sulfur trioxide
b. Sulfur dioxide
c. Carbon dioxide
d. Global warming

Question. Coliphase ϕ × 174 virus contains:
a. Single stranded RNA
b. Single stranded DNA
c. Double stranded RNA
d. Double stranded DNA

Question. Reverse transcriptase is:
a. RNA dependent DNA polymerase
b. DNA dependent RNA polymerase
c. DNA dependent DNA polymerase
d. RNA dependent RNA polymerase

Question. T-bacteriophages possess:
a. Rounded shape
b. Irregular shape
c. Tadpole shape
d. Rhomboid shape

Question. Circular single stranded DNA occurs bacteriophage:
a. T₂, T₄
b. T₃, ϕ6
c. ϕ × 174, M13
d. δ, T₅

Question. RNA retroviruses have a special enzyme that:
a. Transcribles viral RNA to cDNA
b. Translates host DNA
c. Disintegrates host DNA
d. Polymerises host DNA

Question. Severe Acute respiratory syndrome (SARS):
a. Is caused by a variant of common cold virus (Corona virus)
b. Is an acute form of asthma
c. Affects non-vegetarians faster than vegetarians
d. Is caused by a variant of Pneumococcus pneumoniae

Question. Potato Spindle Tuber disease is caused due to:
a. Viroid
b. Virus
c. Bacterium
d. Nematode

Question. The smallest organisms which cause diseases among plants are:
a. Mycoplasma
b. Fungi
c. Bacteria
d. Viruses

Image Based Questions

Question. In a bacteriophage, select the correct information?

a. A – Head, B – Neck
b. A – Head, D – Sheath
c. B – Collar, D – Tail fibres
d. C – Sheath, A – Collar

Question. Name the virus and identify the correct statement about it:

a. Genetic material is single stranded DNA
b. Elongated capsid
c. Reverse transcriptase enzyme is present
d. It is an animal virus

Question. Name the labeled part of Bacteriophage.

a. Neck
b. Sheath
c. Coiled circular double stranded DNA
d. Collar

Higher Order Questions

Question. Bacteria with flagella on both sides are
a. Amphitrichous
b. Cephalotrichous
c. Peritrichous
d. Lophotrichous

Question. In which of the following patterns of viral replication, viruses enter a cell, replicate and then cause the cell to burst, releasing new viruses?
a. Lytic
b. Lysogenic
c. Repreogenic
d. Both (a) and (b)

Question. Which of the following cannot be grown on artificial culture medium?
a. Escherichia coli
b. TMV
c. Aspergillus
d. Yeast

Question. Sometimes virus attacks a bacterium but none of them dies. The phenomenon is
a. Transduction
b. Penetration
c. Lysogeny
d. Adsorption

Question. Which of the following are absent in Eubacteria
A. 80S Ribosomes
B. Cellulosic cell walls
C. Plasma membrane
D. Circular dsDNA
a. A & C b. B & C
c. A & B d. C & D

Question. Match the columns and find out the correct combination:

A. Viroid	1. Nucleoprotein
B. Virus	2. Infectious protein
C. Prion	3. Infectious nucleic acid
D. Virion	4. Infectious viral particle

a. A-4 B-1 C-2 D-3
b. A-2 B-4 C-1 D-3
c. A-3 B-1 C-2 D-4
d. A-4 B-2 C-3 D-1

Question. Match the columns and find out the correct combination:

A. Binary fission	1. Bacteria
B. Budding	2. Yeast
C. Somatogamy	3. Some higher fungi
D. Oogamy	4. Algal

a. A-1 B-2 C-3 D-4
b. A-4 B-2 C-1 D-3
c. A-1 B-4 C-2 D-3
d. A-4 B-1 C-2 D-3

NCERT Exemplar Problems

Question. All eukaryotic unicellular organisms belong to:
a. Monera
b. Protista
c. Fungi
d. Bacteria

Question. Organisms living in salty areas are called as:
a. Methanogens
b. Halophiles
c. Heliophytes
d. Thermoacidophiles

Question. An association between roots of higher plants and fungi is called:
a. Lichen
b. Fern
c. Mycorrhiza
d. BGA

Question. Contagium vivum fluidum was proposed by:
a. DJ lvanowsky
b. MW Beijernek
c. Stanley
d. Robert Hook

Question. Difference between virus and viroid is:
a. Absence of protein coat in viroid but present in virus.
b. Presence of low molecular weight RNA in virus but absent in viroid.
c. Both (a) and (b)
d. None of the above

Question. Viruses are non-cellular organisms, but replicate themselves once they infect the host cell. To which of the following kingdom do viruses belong to?
a. Monera
b. Protista
c. Fungi
d. None of these

Past Year Questions

Question. Match correct option using the codes given below:

Column-I	Column-II
A. Pistils fused together	1. Gametogenesis
B. Formation of gametes	2. Pistillate
C. Hyphae of higher Ascomycetes	3. Syncarpous
D. Unisexual female flower	4. Dikaryotic

a. A-1 B-2 C-4 D-3
b. A-3 B-1 C-4 D-2
c. A-4 B-3 C-1 D-2
d. A-2 B-1 C-4 D-3

Question. A location with luxuriant growth of lichens on the trees indicate that the
a. Location is not polluted
b. Trees are very healthy
c. Trees are heavily infested
d. Location is highly polluted

Question. Which one of the following matches is correct?

a. Mucor	Reproduction by Conjugation	Ascomycetes
b. Agaricus	Parasitic fungus	Basidiomycetes
c. Phytophthora	Aseptate mycelium	Basidiomycetes
d. Alternaria	Sexual reproduction absent	Deuteromycetes

Question. Cell wall is absent in:
a. Funaria
b. Mycoplasma
c. Nostoc
d. Aspergillus

Question. Five kingdom system of classification suggested by R.H. Whittaker is not based on:
a. Complexity of body organization
b. Presence or absence of a well defined nucleus
c. Mode of reproduction
d. Mode of nutrition

Question. Read the following five statements (A – E) and answer as asked next to them.
A. In Equisetum, the female gametophyte is retained on the parent sporophyte.
B. In Ginkgo male gametophyte is not independent.
C. The sporophyte in Riccia is more developed than that in Polytrichum.
D. Sexual reproduction in Volvox is isogamous.
E. The spores of slime molds lack cell walls.
How many of the above statements are correct?
a. Two
b. Three
c. Four
d. One

Question. Nuclear membrane is absent in:
a. Nostoc
b. Penicillium
c. Agaricus
d. Volvox

Question. Auxospores and hormocysts are formed respectively by:
a. Some diatoms and several Cyanobacteria
b. Some Cyanobacteria and several diatoms
c. Several Cyanobacteria and several diatoms
d. Several diatoms and a few Cyanobacteria

Question. Phenetic classification of organisms is based on:
a. The ancestral lineage of existing organisms
b. Dendogram based on DNA characteristics
c. Sexual characteristics
d. Observable characteristics of existing organisms

Question. The chief advantage of encystment to an Amoeba is:
a. The ability to survive during adverse physical conditions
b. The ability to live for some time without ingesting food
c. Protection from parasites and predators
d. The chance to get rid of accumulated waste products

Question. Difference in Gram +ve and Gram -ve bacteria is due to:
a. Cell wall
b. Cell membrane
c. Ribosome
d. Cytoplasm

Question. Indicator of water pollution:
a. E. Coli
b. Chlorella
c. Beggiatoa
d. Ulothrix

Question. Which of the following survives a temperature of 104°C to 106°C?
a. Marine Archaebacteria
b. Hot water spring thermophiles
c. Seeds of angiosperms
d. Eubacteria

Question. The site of respiration in bacteria is:
a. Ribosome
b. Microsome
c. Episome
d. Mesosome

Question. The tailed bacteriophages are:
a. Motile on surface of bacteria
b. Non-motile
c. Motile onsurface of plant leaves
d. Actively motile in water