Characteristics of Order Mermithidae

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Questions and Answers

What is the primary reason for genetically engineering baculoviruses with genes encoding insect-specific toxins?

  • To make the viruses more resistant to pesticides
  • To enhance the viruses' insecticidal efficacy (correct)
  • To increase the viruses' ability to infect a wider range of hosts
  • To improve the structural stability of the viruses

Which type of baculovirus is known to infect over 500 species of insects and is most commonly found in Lepidoptera?

  • Obligate parasites
  • Granuloviruses (GV)
  • Nuclear Polyhedrosis Viruses (NPVs)
  • Nucleopolyhedroviruses (NPV) (correct)

What are the infectious virus particles of NPVs called when they are occluded in protein bodies?

  • Granuloviruses
  • Nucleopolyhedroviruses
  • Polyhedra (correct)
  • Virions

How do insect larvae infected with NPV usually die?

<p>After 5 to 12 days from infection, depending on various factors (C)</p> Signup and view all the answers

Where in the insect does reproduction of NPV primarily take place after ingestion by the host?

<p>Primarily in the fat body, epidermis, and blood cells (D)</p> Signup and view all the answers

What happens to infected insect larvae just before dying from an NPV infection?

<p>They crawl to elevated structures where they die and decompose (D)</p> Signup and view all the answers

What is the general reproductive mode of nematodes?

<p>Amphimictic (D)</p> Signup and view all the answers

Which term describes the condition where males and females of nematodes are present separately?

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

What is the term for the type of parasitism where the parasite may kill the host?

<p>Obligate parasitism (A)</p> Signup and view all the answers

Which system is absent in nematodes among the following?

<p>Respiratory system (D)</p> Signup and view all the answers

What is the primary method of reproduction in nematodes where males are not required?

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

Which feature makes Mermithids particularly attractive for biocontrol?

<p>Inundative release potential (C)</p> Signup and view all the answers

What is a common characteristic of aquatic Mermithids regarding infection process?

<p>Entry into the hemocoel leading to early emergence (C)</p> Signup and view all the answers

Which of these is an example of a terrestrial Mermithid?

<p>Romanomermis culicivorax (C)</p> Signup and view all the answers

What is a characteristic of Rhabditidae nematodes in terms of host range?

<p>Wide host range (A)</p> Signup and view all the answers

Which statement accurately describes Steinernematidae nematodes?

<p>Host entry followed by release of Photorhabdus bacteria (D)</p> Signup and view all the answers

What host range is most susceptible to Steinernema carpocapsae?

<p>Lepidopterous larvae (D)</p> Signup and view all the answers

Which species is known for affecting immature Dipterans and being effective at low temperatures?

<p>Stienernema feltiaz (C)</p> Signup and view all the answers

What is a common form of host resistance mentioned in the text?

<p><em>Melanization</em> (C)</p> Signup and view all the answers

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