Plant Pathology

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Questions and Answers

What is a virus?

  • A nucleoprotein that multiplies only in non-living cells
  • A nucleoprotein that multiplies only in living cells (correct)
  • A microorganism visible with a light microscope
  • A type of fungi causing diseases in plants

What is the size of a virus?

  • Large enough to be seen with a light microscope
  • Too small to be seen individually with a light microscope (correct)
  • Slightly smaller than a bacteria cell
  • Visible to the naked eye

How many viruses are known to date?

  • Around 1,000
  • Exactly 3,000
  • Less than 500
  • More than 2,000 (correct)

What do viruses parasitize?

<p>Living cells of various organisms (B)</p> Signup and view all the answers

What are viruses composed of?

<p>Nucleic acid and protein (A)</p> Signup and view all the answers

What is the nature of viruses?

<p>Chemical molecules (A)</p> Signup and view all the answers

Which of the following diseases can be caused by viruses?

<p>Influenza (B)</p> Signup and view all the answers

How many different species of plants can one virus infect?

<p>Dozens (B)</p> Signup and view all the answers

In addition to plants, what other living organisms can viruses attack?

<p>Humans and animals (C)</p> Signup and view all the answers

What is the primary function of the protein in viruses?

<p>Forming a protective coat around the nucleic acid (D)</p> Signup and view all the answers

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Study Notes

What is a Virus?

  • A virus is an infectious agent that replicates inside the cells of an organism.

Characteristics of Viruses

  • The size of a virus varies between 20-400 nanometers (nm) in diameter.
  • To date, over 2,000 species of viruses are known.

Host Range of Viruses

  • Viruses parasitize a wide range of organisms, including animals, plants, fungi, and bacteria.

Composition of Viruses

  • Viruses are composed of genetic material (either DNA or RNA) surrounded by a protein coat called a capsid.

Nature of Viruses

  • Viruses are not considered living organisms, as they cannot reproduce on their own and require a host cell to replicate.

Diseases Caused by Viruses

  • Viruses can cause a variety of diseases, including influenza, HIV, Ebola, measles, and COVID-19.

Host Range of Plant Viruses

  • A single virus can infect multiple species of plants, with some viruses able to infect hundreds of different plant species.

Range of Host Organisms

  • In addition to plants, viruses can also attack animals, bacteria, and fungi.

Function of Protein in Viruses

  • The primary function of the protein in viruses is to protect the viral genome and facilitate its transmission to a host cell.

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