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Which of the following is a viral disease of potato ?

A. Early blight of potato

B. Late blight of potato

C. Leaf roll of potato

D. None of these

Correct Answer :

B. Late blight of potato


Related Questions

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Dahlia mosaic virus contains

A. DNA

B. RNA

C. DNA and RNA

D. None of these

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The virus DNA which is incorporated into bacterial DNA is termed as

A. episome

B. mesosome

C. free DNA

D. T-phage

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Virus is a.............................. stage between living and non-living.

A. balanced

B. threshold

C. transitional

D. none of these

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The disease in man caused by viruses is

A. mumps

B. cholera

C. typhoid

D. plague

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The exception to the cell theory of Schleiden and Schwann are

A. viruses

B. bacteria

C. algae

D. fungi

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Viral DNA incorporated in host DNA is known as

A. prophage

B. vegephaege

C. cyanophage

D. phycophage

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Which of the following is an example of DNA containing plant virus ?

A. Tobacco mosaic virus

B. Potato mosaic virus

C. Cauliflower mosaic virus

D. Tomato mosaic virus

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Which of the following phenomenon is absent in virus ?

A. Replication

B. Mutation

C. Production of energy

D. Growth

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Viruses with two types of symmetry, U. icosahedral head and helical tail are called

A. picornaviruses

B. binal viruses

C. riboviruses

D. none of these

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Virus which attacks E.coli is called

A. bacteriophage

B. coliphage

C. phytophage

D. zoophage

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A bacteriophage and a yeast cell are similar in that, both

A. are colourless

B. have enzymes

C. have nucleic acids

D. none of these

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Which of the following is a viral disease of potato ?

A. Early blight of potato

B. Late blight of potato

C. Leaf roll of potato

D. None of these

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A stage in the replication of virus, when the cell wall of host is ruptured is known as

A. lesion

B. lysis

C. autolysis

D. haemolysis

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Transduction was discovered by

A. Safferman and Morris

B. Lederberg and Zinder

C. Smithv and Knight

D. None of these

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A virus contains

A. an outer protein coat and a central core of DNA or RNA

B. outer RNA or DNA and a central core of proteins

C. only nucleic acids

D. only protein coats

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Which of the following is devoid of protein coat, with a constitution of RNA only ?

A. Tobacco mosaic virus

B. Poxvirus

C. Potato spindle tuber virus

D. None of these

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A clear /.one lot uwhI in bacterial < olon due to viral action is railed

A. plaque

B. phnge

C. streak

D. krnn/

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Coliphage mX 174 contains:

A. double stranded RNA

B. single stranded DNA

C. double stranded DNA

D. single stranded RNA

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Influenza virus contains

A. DNA

B. RNA

C. both DNA and RNA

D. none of these

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Viruses were discovered by

A. Stanley

B. Iwanowiski

C. Twort

D. Herelle

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Where is the protein for protein coat of virus synthesized ?

A. RNA of the virus

B. DNA of the virus

C. RNA of the host

D. Ribosome of the host

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Viruses differ from living organisms in that, they

A. can grow inside a living host

B. can multiply inside a living host

C. can undergo mutation inside a living host

D. are non-cellular

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Genetic modification brought about by a virus in a bmleria is known as

A. transformation

B. transduction

C. conjugation

D. candidiasis

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The smallest virus has a size of

A. 1 nm

B. 3 nm

C. 6 nm

D. 2 nm

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Edward Jenner discovered

A. vaccination against small pox

B. vaccination against chicken pox

C. immunization against small pox

D. immunization against chickcn pox

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Roux Sarcoma virus contains

A. RNA

B. DNA

C. DNA and RNA

D. none of these

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Viruses are defined as

A. a buch of genomes which are looking for a suitable host for replication

B. micro-organisms which contains DNA only

C. smallest micro-organisms causing disease

D. micro-organisms which contains RNA only

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Which of the following is a Capsid ?

A. Protein part of virus

B. Nucleic part of virus

C. Both (a) and (b)

D. None of these

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Viruses are believed to be

A. living organisms

B. non-living organisms

C. a transitional group between living and non-living world

D. living organisms which have lost the power of multiplication

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RNA particles causing symptoms like those of viral diseases is known as

A. virion

B. vira

C. viroid

D. none of these