The thickened central portion of closing membrane in the bordered pits is called

Options :
  1. Margo
  2. Torus
  3. Pit aperture
  4. Pit chamber
Answer and Explanation :-

Answer: Option 2

Explanation:

The torus is discoid and its diameter is more than that of pit aperture. The unthickened portion of closing membrane around torus is called margo

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