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Paper II — 2024 August (Supplementary) (2010 Scheme) — Q11

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Paper II
2024 August (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Draw and label fertilized egg of Ascaris lumbricoides

Q112 marksShort Notes

Answer

A labelled diagram cannot be rendered in this text-based answer; the description below covers the key structural/labelling features.

Fertilized egg of Ascaris lumbricoides:

  • Shape: broadly oval/rounded.
  • Shell: thick, three-layered — an outer mammillated (bumpy/coarsely granular) albuminous coat, a middle thick, transparent glycoprotein shell, and an inner lipid (vitelline) membrane.
  • Colour: typically bile-stained golden-brown.
  • Contents: a single, large, unsegmented, granular ovum filling most of the interior, with a clear space at each pole.
  • Size: approximately 60–75 μm × 40–50 μm.

Contrast (labelling note): the unfertilized egg is more elongated, thinner-shelled, with an irregular mammillated coat, and contains disorganized refractile granules instead of a single well-defined ovum.

  1. 1Bacterial Morphology and Physiology

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