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SSC CGL 2022 PYQ — Question 45

SSC CGL - 01 Dec 2022 - Shift 4 • General Awareness • Q45

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Which of the following Phylum have a single opening in their digestive system that serves both as a mouth and an anus?

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Correct answer: C

Explanation

The correct answer is option 3 i.e. Platyhelminthes

Blind sac organization is the body organization that consists of a single opening serving as both the mouth and the anus. It is found in phyla like Cnidaria, Ctenophora, and Platyhelminthes.

Phylum-Platyhelminthes.commonly known as the flatworms. This have incomplete alimentary canal, there is a single opening for both ingestion and egestion. This is also called as blind sac body plan.

  • They are free-living or parasites.
  • Body is covered with the ciliated epithelium.
  • Body is unsegmented and dorsoventrally flat.
  • Excretion occurs by means of flame cells.
  • The digestive system may be absent or present. If present, it is described as incomplete due to the absence of anus.
  • The regeneration process iswell marked in some flatworms like Planaria.

Eg:- of Phylum-Platyhelminthes -

  • Taenia (Tapeworms)
  • Fasciola (Liver fluke)
  • Taenia saginata (Beef tapeworm)
  • Echinococcus granulosus – The dog tapeworm.
  • Planeria (freshwater flatworm) etc.