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Human Health and Disease — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
Choose the correct statement with reference to Ascaris:
  • A
    Hatching of embryos takes place in the stomach due to lytic enzyme.
  • B
    Adulthood is reached inside the body of the host in ten days time.
  • C
    Development and moulting takes place in the alveoli of lungs.
  • D
    Hatching of embryo takes places within ten hours.
✓

Answer

  1. Development and moulting takes place in the alveoli of lungs.

Explanation:

Ascaris requires a single host, i.e., man to complete its life cycle.

The most important locations in body of man where Ascaris visits are small intestine and from there it migrates to the lungs through pulmonary circulation where they almost ten times bigger and moult twice.

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