Ascaris Life Cycle and Transmission
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Questions and Answers

What is the approximate lifespan of an adult worm of A. lumbricoides?

  • 6-12 weeks
  • 2-5 years
  • 5-10 years
  • 12-20 months (correct)

When do the gravid females of A. lumbricoides start laying eggs?

  • After 12-20 months
  • After 2 years
  • After 6-12 weeks (correct)
  • At birth

What is the primary cause of pathogenic effects of larval migration in ascariasis?

  • Presence of larvae in the lungs
  • Inflammation caused by larvae
  • Toxic secretions by larvae
  • Allergic reaction to larvae (correct)

What is the characteristic manifestation of ascaris pneumonia?

<p>Low-grade fever (C)</p> Signup and view all the answers

What is the potential complication of ectopic ascariasis?

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

What is the characteristic feature of the sputum in ascaris pneumonia?

<p>Blood-tinged (D)</p> Signup and view all the answers

What is the usual habitat of adult Ascaris lumbricoides?

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

What is the distinctive feature of the male Ascaris worm?

<p>Hook-shaped posterior end (C)</p> Signup and view all the answers

How many eggs can a single female Ascaris worm lay per day?

<p>Up to 200,000 (C)</p> Signup and view all the answers

What is the difference between fertilized and unfertilized eggs of Ascaris?

<p>Fertilized eggs are embryonated, while unfertilized eggs are not (C)</p> Signup and view all the answers

What is the length of the female Ascaris worm?

<p>20-40 cm (B)</p> Signup and view all the answers

How many lips does the mouth of the Ascaris worm have?

<p>3 (D)</p> Signup and view all the answers

What is the characteristic of an unfertilized egg of Ascaris?

<p>It is elongated (D)</p> Signup and view all the answers

What is the natural host of Ascaris?

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

How is Ascaris infection usually transmitted?

<p>Through contaminated food and water (D)</p> Signup and view all the answers

Where do the larvae of Ascaris develop and moult twice?

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

How do the larvae of Ascaris reach the alveoli?

<p>They penetrate the lung capillaries (B)</p> Signup and view all the answers

Where do the larvae of Ascaris finally develop into adults?

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

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