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Objective Questions

Latest Biology Botany Exam Question (Objective Questions), MCQ in English

Subjects : Botany

Question Bank Biology (Botany) - English
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Botany

Question 1Single Answer
Plant viruses usually contain :
  1. A
    RNA
  2. B
    DNA
  3. C
    DNA and RNA
  4. D
    DNA or RNA
Question 2Single Answer
Viruses were discovered by :
  1. A
    Stanley
  2. B
    Ivanowski
  3. C
    Twort
  4. D
    Herelle
Question 3Single Answer
Which statement best defines viruses?
  1. A
    Acellular infectious agents that replicate only inside living host cells
  2. B
    Cellular microorganisms containing only DNA
  3. C
    Free-living microorganisms capable of independent metabolism
  4. D
    Cellular microorganisms containing only RNA
Question 4Single Answer
Which infectious agents consist essentially of small, naked RNA molecules without a protein coat?
  1. A
    Virions
  2. B
    Prions
  3. C
    Viroids
  4. D
    Bacteriophages
Question 5Single Answer
Coliphage f X 174 contains :
  1. A
    double stranded RNA
  2. B
    single stranded DNA
  3. C
    double stranded DNA
  4. D
    single stranded RNA
Question 6Single Answer
Viruses differ from living organisms in that, they :
  1. A
    can grow inside a living host
  2. B
    can multiply inside a living host
  3. C
    can undergo mutation inside a living host
  4. D
    are non-cellular
Question 7Single Answer
Virus which attacks E.coli is called :
  1. A
    bacteriophage
  2. B
    coliphage
  3. C
    phytophage
  4. D
    zoophage
Question 8Single Answer
Which characteristic distinguishes viruses from cellular organisms?
  1. A
    They possess ribosomes for protein synthesis
  2. B
    They have independent energy metabolism
  3. C
    They are acellular and depend on host cells for replication
  4. D
    They reproduce by binary fission
Question 9Single Answer
The genome of a temperate bacteriophage integrated into the bacterial chromosome is termed as?
  1. A
    Prophage
  2. B
    Episome
  3. C
    Plasmid
  4. D
    Capsomere
Question 10Single Answer
Virus was crystallized and isolated first by :
  1. A
    J.D. Ivanowski
  2. B
    F.C. Bawden
  3. C
    W.M. Stanley
  4. D
    K.M. Smith
Question 11Single Answer
Little leaf disease of brinjal is primarily associated with which pathogen?
  1. A
    Phytoplasma
  2. B
    Begomovirus
  3. C
    Fungus
  4. D
    Viroid
Question 12Single Answer
Which approximate size range includes many of the smallest known conventional virus particles?
  1. A
    20–30 nm
  2. B
    100–150 nm
  3. C
    500–700 nm
  4. D
    1–2 µm
Question 13Single Answer
Which of the following is devoid of protein coat, with a constitution of RNA only ?
  1. A
    Tobacco mosaic virus
  2. B
    Poxvirus
  3. C
    Potato spindle tuber virus
  4. D
    None of the above
Question 14Single Answer
Genetic modification brought about by a virus in a bacteria is known as :
  1. A
    transformation
  2. B
    transduction
  3. C
    conjugation
  4. D
    candidiasis
Question 15Single Answer
Which property makes the classification of viruses as strictly living or non-living problematic?
  1. A
    They reproduce independently outside cells
  2. B
    They possess cellular organelles but lack DNA
  3. C
    They replicate in host cells but are metabolically inactive outside them
  4. D
    They perform independent respiration outside host cells
Question 16Single Answer
Influenza viruses contain which type of genetic material?
  1. A
    Double-stranded DNA
  2. B
    Single-stranded RNA
  3. C
    Single-stranded DNA
  4. D
    Double-stranded RNA
Question 17Single Answer
Edward Jenner is best known for pioneering vaccination against which disease?
  1. A
    Smallpox
  2. B
    Chickenpox
  3. C
    Rabies
  4. D
    Poliomyelitis
Question 18Single Answer
Roux Sarcoma virus contains :
  1. A
    RNA
  2. B
    DNA
  3. C
    DNA and RNA
  4. D
    None of these
Question 19Single Answer
Which of the following is a viral disease of potato ?
  1. A
    Early blight of potato
  2. B
    Late blight of potato
  3. C
    Leaf roll of potato
  4. D
    None of the above
Question 20Single Answer
The term Virus' has been derived from a Latin word meaning :
  1. A
    poison
  2. B
    secretion
  3. C
    cell
  4. D
    venom
Question 21Single Answer
Which of the following is an example of DNA containing plant virus ?
  1. A
    Tobacco mosaic virus
  2. B
    Potato mosaic virus
  3. C
    Cauliflower mosaic virus
  4. D
    Tomato mosaic virus
Question 22Single Answer
Rabies is caused by :
  1. A
    viruses
  2. B
    slime moulds
  3. C
    fungi
  4. D
    bacterium
Question 23Single Answer
A clear area produced when bacteriophages lyse bacterial cells growing on a culture medium is called a?
  1. A
    Plaque
  2. B
    Colony
  3. C
    Streak
  4. D
    Capsule
Question 24Single Answer
An antiviral substance produced by many vertebrates in response to viral infection for resisting the multiplication of viruses is known as : 
  1. A
    antivirin
  2. B
    antigen
  3. C
    virion
  4. D
    interferon
Question 25Single Answer
Viruses with two types of symmetry, i.e., icosahedral head and helical tail are called :
  1. A
    picornaviruses
  2. B
    binal viruses
  3. C
    riboviruses
  4. D
    none of these
Question 26Single Answer
Which of the following is a Capsid ?
  1. A
    Protein part of virus
  2. B
    Nucleic part of virus
  3. C
    Both (a) and (b)
  4. D
    None of these
Question 27Single Answer
A stage in the replication of virus, when the cell wall of host is ruptured is known as :
  1. A
    lesion
  2. B
    lysis
  3. C
    autolysis
  4. D
    haemolysis
Question 28Single Answer
Which metabolic capability is absent in viruses?
  1. A
    Independent ATP-generating metabolism
  2. B
    Genetic mutation
  3. C
    Genome replication within a suitable host
  4. D
    Assembly of progeny virions inside host cells
Question 29Single Answer
The exception to the cell theory of Schleiden and Schwann are :
  1. A
    viruses
  2. B
    bacteria
  3. C
    algae
  4. D
    fungi
Question 30Single Answer
An extreme example of latency in which the DNA of the phage is integrated with the DNA of host cell chromosome is :
  1. A
    lysis
  2. B
    lysogeny
  3. C
    prophage
  4. D
    attenuated virus
Question 31Single Answer
Which feature is characteristic of all viruses?
  1. A
    They require living host cells for replication
  2. B
    They contain proteins but no nucleic acid
  3. C
    They replicate exclusively in the cytoplasm
  4. D
    They infect only bacterial cells
Question 32Single Answer
One of the following discovered synthesis of DNA from RNA in Roux Sarcoma Virus :
  1. A
    Smith
  2. B
    Temin
  3. C
    Twort
  4. D
    Mayer
Question 33Single Answer
Which component is present in both a bacteriophage and a yeast cell?
  1. A
    Nucleic acid
  2. B
    Mitochondria
  3. C
    Golgi apparatus
  4. D
    Endoplasmic reticulum
Question 34Single Answer
Transduction was discovered by :
  1. A
    Safferman and Morris
  2. B
    Lederberg and Zinder
  3. C
    Smith and Knight
  4. D
    None of these
Question 35Single Answer
Viral DNA incorporated in host DNA is known as :
  1. A
    prophage
  2. B
    vegephage
  3. C
    cyanophage
  4. D
    phycophage
Question 36Single Answer
Most antibiotics have no direct effect on viruses primarily because?
  1. A
    Viruses form antibiotic-resistant endospores
  2. B
    Viruses are larger than bacterial cells
  3. C
    Viruses lack the cellular structures and metabolic pathways targeted by antibiotics
  4. D
    Viruses possess impermeable cellulose walls
Question 37Single Answer
Dahlia mosaic virus contains :
  1. A
    DNA
  2. B
    RNA
  3. C
    DNA and RNA
  4. D
    None of these
Question 38Single Answer
The disease in man caused by viruses is :
  1. A
    mumps
  2. B
    cholera
  3. C
    typhoid
  4. D
    plague
Question 39Single Answer
Where is the protein for protein coat of virus synthesized ?
  1. A
    RNA of the virus
  2. B
    DNA of the virus
  3. C
    RNA of the host
  4. D
    Ribosome of the host
Question 40Single Answer
A virus contains
  1. A
    an outer protein coat and a central core of DNA or RNA
  2. B
    outer RNA or DNA and a central core of proteins
  3. C
    only nucleic acids
  4. D
    only protein coats
Question 41Single Answer
Which of the following does not contain DNA ?
  1. A
    T-2 bacteriophage
  2. B
    Dahlia mosaic virus
  3. C
    Roux sarcoma virus
  4. D
    All animal viruses
Question 42Single Answer
Which tissue-culture technique is commonly used to obtain virus-free plants from systemically virus-infected stock?
  1. A
    Shoot apical meristem culture
  2. B
    Mature xylem culture
  3. C
    Mature phloem culture
  4. D
    Pollen storage
Question 43Single Answer
Which property provides evidence for the biological activity of viruses inside suitable host cells?
  1. A
    Replication of their genetic material
  2. B
    Independent cellular respiration
  3. C
    Independent protein synthesis by ribosomes
  4. D
    Binary fission outside host cells
Question 44Single Answer
In classical virus classification, a cryptogram was designed primarily to provide coded information about which features?
  1. A
    Major properties of a virus and its genome
  2. B
    Only the colour of infected tissues
  3. C
    Only the geographical origin of a virus
  4. D
    Only the name of the virus discoverer
Question 45Single Answer
Which term describes a genetic element capable of existing autonomously as well as becoming integrated into a host chromosome?
  1. A
    Episome
  2. B
    Capsomere
  3. C
    Virion
  4. D
    Viroid
Question 46Single Answer
Tissue culture is used in research of...... extensively .
  1. A
    fungi
  2. B
    bacteria
  3. C
    algae
  4. D
    viruses
Question 47Single Answer
The protein coat of a virus is made up of
  1. A
    capsid
  2. B
    episome
  3. C
    protein
  4. D
    capsomeres
Question 48Single Answer
Which of the following is not a viral disease of man ?
  1. A
    Influenza
  2. B
    Whooping cough
  3. C
    Rabies
  4. D
    Small pox
Question 49Single Answer
Double stranded RNA viruses are known as :
  1. A
    riboviruses
  2. B
    reoviruses
  3. C
    ribovira
  4. D
    arboviruses
Question 50Single Answer
The viruses that infect blue green algae are called :
  1. A
    cyanophages
  2. B
    phages
  3. C
    phycophages
  4. D
    coliphage
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