Spermathecae in $Pheretima$ are located in the segments:

  • A
    $14$ to $18$
  • B
    $10$ to $13$
  • C
    $7$ to $10$
  • D
    $6$ to $9$

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The intestinal excretory organs (septal nephridia) of $Pheretima$ have a function of:

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Comment upon the gametic exchange in earthworm during mating. Discuss the physiology of reproduction in earthworms.

The parasite found in the seminal vesicle of earthworm is:

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